Car won't do anything when you try to start it, happens intermittently, not always.

...at this point am going to have to recommend that you get a copy of the schematic, a set of wire piercers for testing the wires, both when the problem is occuring and when it's not occurring...with the piercers, you don't have to disconnect anything, makin testing a jif-

theirs a reley for that you know,may have dirty points in relay

Jim. dig deeper clue us one or two~

My guess is the starter is being starved of enough amperage. It may, like the rest of the cars electric system be getting some amps along with 12volts, but not enough "juice". If the starter itself has a marginal ground I.e. loose bolts or even a oily mounting flange, it won't allow the current to go through the system.

bobby you know you could write a book on possibles,and create confusion,look at the simple first! and move thrue

Could it be worn cylinders in the ignition switch?

any updates on this problem? my 2013 sonata is doing the same thing

Our 2006 Sonata is doing the same thing. It will start without issue for weeks, then it will take 20 mins of turning the key to get it to start for a week. All electrical works during the non starts and all fuses and relays are good. Was going to replace the starter but have seen too many on here throwing parts at the problem with no resolution. Will never purchase another Hyundai.

The ignition lock cylinder and the ignition lock cylinder housing Likely the solution. My total cost with labor was $653.09. On 3/13/2012 at 11:08:11 A.M, under Hyundai case 4758349 (established while this vehicle was within warranty) .My headlights, bright beams, radio and clock simultaneous become disabled and any attempt in the normal course of operating this vehicle to shift the car between park and drive causes a loud grinding noise. This issue corrected itself after another grinding noise when shifting the gear lever into park and the car began functioning normally. At some point out of warranty the vehicle wouldn't start from the ignition. After replacing The ignition lock cylinder and the ignition lock cylinder housing the issues are solved

I own (2) Hyundai's, ignition switch failure cost around $500, not counting the cost of towing. The second car is now in the dealer....yes, another failed igintion switch. I give up!!!! two different Sonatas with costly ignition repairs!! Where's the quality control, Hyundais "Mute" on this issue

a small piece of plastic breaks and block the key from turning.... causes KEY CAN NOT TURN...LOCK SMITH that knows this can remove the broken plastic.... replacing IGNITION LOCK CYLINDER (ilc)is not permanent fix.. plastic that breaks is from switch that alarms when you leave key in car.... cost is $70.00 in jax fl.... IGNITION LOCK CYLINDER IS OK..... RAMOS1 IN JAX FL

If the people answering these questions would do a little research they would find this is actually a very common problem with 06-09 sonata and azera. I have the same exact problem and have tried every biy of advice I've found but still no solution. There's even a place to file an official complaint to attempt to get a recall. Unfortunately at the time of this post I don't remember the website.I will tell you what I have done maybe one of these will work for you. I have cleaned the ground contacts for the battery thrn replaced the battery replaced the solenoid and starter and a new ignition switch. still doesn't start randomly. The weird thing is I could drive it casually for 5 minutes and it won't start I can drive it really hard for 3 hours and it will start afterward. its done it in the winter and summer. one time it wouldn't start for 2 days and it was winter. if you figure it out plz contact me.

Park switch or another safety switch so the vehicle cannot be started in gear might be killing the signal to activate starter?

I'm not sure if that is the answer the times it doesn't start I just sit there and turn the key off then try to start then off then try to start etc... I don't do anything other than that and eventually it starts. Like I've said positive it's not the starter or battery. I'm afraid to mess around with the ignition switch on my own know nothing about the antitheft. Someone told me to check the points just afraid it'll mess with the antitheft system.

Unless of course you are saying the switch is giving the ignition or starter a false signal that it is not in park/neutral.

Yes, maybe ramming the shifter around a little while trying to start it next time it acts up may yield results.

I'm having this issue right now. I've tried moving the shifter around....nothing. I put in neutral....nothing. I've come to the conclusion that this car is a piece of crap and the company dropped it in the toilet (consumers) by making it affordable to those that can afford better cars.

We finally got rid of the Sonata since we could not resolve this issue. We spent hours researching only to find that every blog related to this ended up the same, no definite resolution. Just when we were ready to throw another part at it, further research revealed that is wasn't a starter (or whatever) issue after all. Lots of people paying mechanics and dealers to throw parts at it to no avail. The problem would appear to be resolved only to resurface again days or weeks later. The problem we had was that the key WOULD turn EVERY time, sometimes the car would start, sometimes it wouldn't, the power ALWAYS worked, the battery and fuses all good. Turn the key on and off for 30 mins the car may or may not start, move the shifter around the car may or may not start, reset the battery the car may or may not start, reset the security system the car may or may not start. What SEEMED to work one time would not work the next. Non start happened in all weather, humid or dry, it happened when the car was hot or cold, the car would start consistently for months, then not start often for months. No rhyme or reason. We traded the car in on a new car, told the dealer there were starting issues, got a message from the dealer the next day "whats the secret to starting this? Is it the security system?" That is the $64,000 question. I will never buy or recommend a Hyundai. Good luck to the rest of you!

I have a 2007 Hyundai Sonata. Several times in the past if the key wouldn't turn I took the key out & flipped it over, then it started right away. I just had a new problem today where, when I turned the key, nothing happened. There was no power at all. My husband connected our portable battery charger to the battery & the car started immediately, but I'm not sure that was what actually helped. It may be that it just decided to start. When we got the car home, it started a few times & then didn't start--same issue with no power at all. Auto zone suggested it is either the ignition switch ($17.99) or the park/neutral safety switch, which is located on top of the transmission & easy to reach ($34.99). The way to check for the park/neutral safety switch is, if the car won't start in park, put it in neutral. If it still won't start, it is the park/neutral safety switch--I have to wait until I have the problem again to check that. My mechanic will replace either of these for $50 or less (in addition to the cost of the part). If one's car is no longer under warranty, it may be prudent to find a good independent mechanic. I live in a town of about 60k people, so in a bigger city one may pay more than I would have to pay, but I know several people in rather large cities (i.e., Columbus, OH) who still pay very reasonable rates for mechanical work on their cars. Good luck!

I am dealing with this same problem with a customer of mine with the same car, 2007 sonata. In my experience, this sounds like a transistorised part such as the computer or other device. Neutral safety switches and ignition switches are physical parts that slide into place to make contact. Any deficiencies in those would be obvious upon inspection of the actual contact points. Contacts that are weak would cause hot-spots that would show in the wiring or the contacts themselves. I will have to dig into a schematic to find any transistorised parts or if the starting system is tied into the computer. If I do find a solution, I will post it here. Danilo Fort Lauderdale, Florida

Took my 2006 sonata to the dealership, they replaced the ignition switch and within 2 weeks it was doing the same thing. Just going to throw this fact into the mix - but probably has no bearing whatsoever -- but after the ignition switch was replaced, it started doing this again when my car was parked on a slight downhill slant (and the first time pre-ignition switch) I always use my parking break. Since the initial time and initial time after new ignition switch the slant of my park doesn't matter. I was parked in a level garage and it wouldn't start all day until my boyfriend got rough with it by shoving the steering wheel, moving the gear shift, etc). I take it back to the dealership on Monday and will request to speak with the General Manager, then write a lengthy letter to the Consumer Assistance Center. I'm not sure if Hyundai will issue a recall, but it couldn't hurt for each one of us who are having the same problem to document our actions and let them know how much money we have spent (keep your receipts!) One more thing...according to the "Owner's Handbook Supplement" (see 1st three pages) ".....it is recommended that you take the following steps" 1) Contact your Hyundai dealer and speak with the Service, Parts or Sales Manager. 2)If your concern is not resolved, contact the General Manager or the owner of the dealership either by phone, in person, or in writing. 3) If your concern cannot be resolved quickly by the dealership personnel or management, contact Hyundai's Consumer Assistance Center at 800-633-5151, or write to: HYUNDAI MOTOER AMERICA CONSUMER ASSISTANCE CENTER 10550 Talbert Avenue P.O. Box 20850 Fountain Valley, CA 92728-0850 The book will tell you what to include in your correspondence. Good luck to everyone.

For the average person, this may be a bit too technical, but for a seasoned lad, this should be quite easy. This knowledge is based on the diagram from the Haynes manual. I started by disconnecting the wire from the body control module that ties into the starting system. I originally had a remote start switch connected to the two leads that become connected by the starter relay. The problem still persisted. That very quickly narrowed the search to a wire or some other part not listed in the wiring diagram between the relay and the starter. Since then I connected the remote switch directly to the starter and she has not yet had a moment the remote switch did not work. I will try running new wires from the relay to the starter and see if that solves the problem. If not, I will just run new wires directly from the ignition switch to the starter. Cheers and I hope this helps everyone else out there. Danilo Fort Lauderdale, Florida

My 2007 Sonata has the same intermittent starting problem that has been described by the previous posts. The Hyundai dealership does not know what is causing the problem. The park/neutral safety switch was replaced (parts + labor = $333.00) and did not fix the problem. I was just hours away from starting to put in what ever parts might fix the problem (starter, relay, etc.). Now I'm totally confused as to what I should do next. It appears that several people have already been in my position and have replaced all of the parts I just mentioned. I'm not sure what to do next. If anyone has more insight, I'm all ears. Bryan

my car 09 hyundai sonata was not really flooding but the engine got wet and everything is work is just wont start sound like stater damage, or but some people say the engine is damage is lock because was flooding, i call de dealer ship and they yold they have to check.

Why have these card not been recalled for these problems... I'm so sick of mine doing the same thing. 03 Hyundai sonata. Happens more when more moisture in air or when it rains... but mine just turns off while driving... everything goes dim...lights. ...then power starts to get lost... then dead! And sometimes just won't start.

I was able to find a solution to my customer's problem. I replaced the starter and the problem has disappeared. Cheers. Danilo, Fort Lauderdale, Florida.

I have a 2006 sonata with this same damn issue. Ways i have gotten it to start are putting it in neutral letting car roll back than slam it into park and bam it starts up. However obviously this isn't a fix just a way to get it to start for you. Also I have got out vehicle set alarm wait couple seconds turn off alarm and get it and try starting it again. Everytime my car does this either one of those has gotten my car to start.

I too am having an intermittent starting problem with my 2006 Hyundai Sonata 93,700 miles. I have had the battery, alternator and starter checked and all are fine. The starter always starts when being tested. I can drive across the street, stop and try to restart my car and it won't start. Then I can drive for a week or more without any problems. The dealership wants $112 to do a diagnostic test. Has anyone had a diagnostic test done for this problem? A. Travis

I had every diagnostic test the dealership could perform and they could not locate the problem. I ended up trading my car in for a Toyota.

Its a total shame, but I had to trade my 2006 sonata way before I was ready. My sonata had 176,000 miles when the ignition switch started acting up. I feel fortunate that it didn't happen 100k miles ago like some of you. If it weren't for all of the other things that went wrong in the span of 24 months (transmission, condenser, compressor, Both oils seals, set of tires, pinging noise that spark plugs didn't fix) I probably would have hung in there to find the solution but Hyundai needs to step up to the plate. BTW, I bought a Honda.

Same problem as described on Azera 2007. Wiggle the steering wheel and it starts every time. Good Luck

Thanks, I will try that the next time it won't start. Been 2 days now since it wouldn't start.

Twice today my 2006 Hyundai Sonata wouldn't start. Wiggling the steering wheel did not work for me. I always keep something to read with me. After a while (20-30 minutes), my car started, both time. I'm keeping a log but so far I'm unable to detect a pattern.

This happens to my 2006 Hyundai Sonata as well. Had a mechanic adjust the park / neutral safety switch that is located on top of the transmission under the battery case. This helped some the car starts way more often but still every once in a while we need to move the shifter from park - reverse - neutral - drive and back up. If this doesn't work we push on the back of the car rocking it back and forth 3-4 times "this moves the switch with the flywheel" then it starts every time so far. I'm wondering if contact cleaner would help the problem. I really don't want to try to adjust the switch again. It don't want to make it worse. Hopes this info helps someone and looking for any advice on the issue. Thanks

I had the same problem with the starter on my 2009 hyundai sonata. I first noticed that after i drove for awhile and tried to immediately restart, nothing happened. This is after I replaced the starter after the plastic piece broke. I thought it was some sort of an electrical issue since it was intermittent and always started the next day but had problems restarting just after I drove for awhile. Anyways even thought it was because of a grounding issue and added another bolt to the starter. It finally got the intermittent starter problem resolved by replacing the starter again. I think the first replacement starter had some type of issue that caused the intermittent no-start to happen. It took me more than 2 months of intermittent no-start stress, before replacing the starter.

Have you guys thought about the security system maybe being the problem or the chip in the key not being read?

I believe it does have to do with the factory security John. But what part. My 2006 3.3 has most symptoms as everyone else. It does something new now though. Interior beeping as if the keys are in the ignition but there not. Doors won't lock . But it starts like a champ. When it's not beeping it will start if im lucky. If not i wait and after 5 minutes or so it will start. Blah

I started keeping a log of non-starts. There were 40 between 1-14-16 & 8-4-16. I took this log to my new mechanic, N-Tune Durham NC. They replaced the starter for $582.32. A bargain! After 8 months of dealing with this, it starts every time now. If this changes, I will let you know. A Travis

Hi.I'm having the same problem with my car. Any advise. To repair it.dealership has no ideal what's wrong with it...car will not start at all but has power . 2007 hyundai sonata

Several people above have had success with replacing the starter. That worked for me. 49 days and still running.

OK....the 2006 Sonata's require you to step on the brake in order to start. I have developed the same issues, with sporadic not starting and finally, it stopped starting all together. I noticed that when my son tried to start it, even when he stepped on the brakes, I had no brake lights either. Since you need to step on the brake to complete the circuit to the starter, I think that this issue has more to do with the brake switch than the starter. Any thoughts?

Had this same issue for years. Turn key lights come on but nothing else happens starter relay would click in fuse box under hood. Could wiggle gear shift or steering wheel or wait 5 minutes then it would all of the sudden work. Well finally one day it didn't work. My husband is a mechanic so now ok it wont work we can find the issue. Turns out wire connecting to solenoid has bad connection. Tested by unplugging the solenoid and insert spade connector (he used a fuse) would not stay in no drag at all. Broke plastic away from connector on wire tested on solenoid very loose no drag at all he solder connection at solenoid. FIXED hasn't failed yet! Please try this before investing a bunch of money. He is the best and I best this will fix a lot of these issues.

Im here in Calif. with our 2006 Santa Fe, the intermittent wont start, wait a while problem is getting worse, I will try my starter connections and get back if it works for me.

NCorrol is spot on! See YouTube video resolution for no start here: https://youtu.be/tjfrVE9Guq0

My daughter has a 2007 Sonota. She ran into this starting problem. I changed the battery , then the starter. Worked for one week then stopped working. Went to give the car a jump and noticed the jumper cables didn't arc when attaching them. I attached the negative jumper cable to the battery post the other end to the engine block , the car started. I removed the negative battery cable from the body and sanded the paint off the body and the end of the cable and bolted it back up. Then I located the body to engine block cable (front of engine ) removed it and cleaned connections on both ends. Working so far. So all the trouble was a bad ground!

My 2006 Sonata started with this problem about 3 months ago. It starts most of the time but about once a month when you try to start it, nothing. Moved the steering around and then the shifter and then it starts. Don't want to put a lot of unnecessary parts on it that sounds like it won't fix the problem. It sounds like Hyundai doesn't feel that there is some kind of problem. Any other solutions?

2011 Santa Fe has the same intermittent problem. I've found that changing the steering wheel position will allow the key to start the car (sometimes it's rough to move, but I force it). I haven't taken it in yet to see what kind of fix it needs. I may call Hyundai after reading all these reports to see if they ever issued a recall.

Replace the starter.fork in the starter has broken fork in the starter broke replaced the starter

i have a 2017 sonata that the charger light comes on but it will not charge my samsung phone. My wife has an iphone and experience same issues as well. Any idea what might be the issue? Edwin.

I have 2007 Hyundai Sonata with same starting problems!! Replaced IGNITION, STARTER, and BATTERY in last six months and it still happens to me. I read this post as I sat in my kids cold unstarted Sonata looking for answers. After sitting there for 20 minutes, I rocked the parked car back and forth ( like "brewerkyle" suggested above) AND IT STARTED!!!!! Selling this car as soon as I get home !!

Video on youtube states that a connector to starter probably not making contact or wire is broken. Try that first and see if it fixes the problem

I had the issue just now. Mechanical key wouldn't turn for 29 minutes. Read the post where "getting rough with the steering wheel" resolved it. Tried to turn the steering wheel, and found that it was torqued to one side, likely because the tire was pressed up against a curb. When i turned the steering wheel in both directions while turning the key, it started.

2001 Elantra no crank no start. Bought it used CHEAP, before reading this forum obviously. Guy told me theres a procedure to start the p.o.s. Stick the key in turn it to the on position(A), wait for 2 or 3 chirps(B), then turn ignition switch over to start position (C) and it USED to start every time. And if you shut the car off you'll hear a single chirp. I must wait to hear the single chirp before attempting to start it again. And if you get in and just immediately try and start the car without waiting for the double chirp at all, it won't start. Is this just me or are they all like this? Or does it sound more like an after mark Alarm/security issue? BTW the car didnt come with a key fob. I thinking of replacing the fob first try to sync or reset the transponder if it has one. This is my first, no crank, no start issue.

The 2004 Hyundai Sonata intermittent start issue is commonly encountered and discussed on forums. You open the door, get in the car, put the key in the ignition, turn it to start, aaaaaaand nothing happens. There are many flavors of “fixes” from replacing ignition switches, “low” batteries, starter or other relays and fuses, shifter components, brake activated switches, starter motor wire housings, loose terminal connections at the battery or elsewhere, neutral safety switches...the list actually does go on and on. In my case, none of these were appropriate fixes. It has to do with the way you lock and unlock the vehicle. Here is my fix to the 2004 Hyundai Sonata intermittent start issue: https://youtu.be/muqrsTeXico If the link to the video doesn’t work, search for user nperspective on YouTube and find the Hyundai Sonata 2004 Start Issue video. Good luck!

This started happening to my daughter’s 2012 Sonata yesterday. She had the entire engine replaced a year ago, due to catastrophic engine failure, compliments of Hyundai. Also, she’s had ongoing issues with her radio controls and passenger door not unlocking some of the time. Now this. I read all of the information here and decided to start with replacing the key remote battery and the car is starting fine today... for now. I also told her to get rid of the heavy key chain and swapped out her key for the spare (although both worked today). We will never buy a Hyundai again.

I have a Hyundai Sonata 2006. There was „check engine” light plus this car gave me a lot of trouble. While driving car sometimes lost power and right after power came back. Another time car was turning but it wouldn’t start at all. Next day car was OK. Last time car could not start for two days, than was OK again. In the shop I spent almost two hundred dollars and they said that they do not see any problem, After that car was loosing power for seconds again. I took car to the best mechanic you can imagine. Smart man that specializes in car electronics. He found the problem immediately. It was fuel pump, that has five connectors and one connector was burned, almost melted. They told him $2,500.00 for this part. He bought part for $40. Car runs with no problems and there is no more this horrible „check engine” light. It was fuel pump problem. Regards.

We all need to call consumer protection and demand a recall. 800-638-2772. Federal comsumer protection agency

My 06 sonata has had this issue for a couple years. I'm pretty convinced it has to do with the theft deterrent system deactivating the ignition. All you have to do is hold the key in the start position and it will eventually start. Don't cycle back and forth with the key just hold it in start position. The longest mine takes to start is 1min 30sec. It always works and has never failed. It's annoying to have to wait but no one seems to be able to fix. This applies to 2006 sonatas and other years of that body style.

The intermittent start is now happening to me. I've emailed Hyundai America. This is such a dangerous problem, obviously one of several with the Sonata. Mine is a 2013 with less than 70,000 miles. I'm disgusted and disappointed in this company. These vehicles should be recalled!

https://www.cars.com/articles/2010-2013-2015-hyundai-vehicles-range-sensor-switch-issue-1420682570087/ Vehicles affected by service bulletin: 2012 Hyundai Accent 2011 Hyundai Azera 2012 Hyundai Azera 2011 Hyundai Elantra 2013 Hyundai Elantra coupe 2013 Hyundai Elantra GT 2010 Hyundai Santa Fe 2013 Hyundai Santa Fe 2011 Hyundai Sonata 2015 Hyundai Sonata 2011 Hyundai Tucson 2013 Hyundai Veloster The problem: On an intermittent basis, the engine will either not crank and/or start when the ignition key is turned. This affects cars equipped with a six-speed automatic transmission. Additionally, the malfunction indicator light may illuminate on the dash. A diagnostic scan reveals a problem with the range sensor switch or circuit, revealing a problem with either the switch or the wiring of the circuit.

There was no power to my ignition switch, so i replace the starter on my 2008 Sonata with 205,000 miles. After reading the threads, I decided to check for a ground problem. I attached the jumper cable from the negative terminal to the engine block. This gave me power inside the car and the car started on the first turn of the ignition switch. So clean the ground wires from the battery and i hold this was helpfull. RD

Same problem

I have my Sonata 2006 fixed! Finally, by the best mechanic. It was the fuel pump that has five connectors and one connector was burned (almost melted). It runs fine right now with no problems. Before, it was losing power on the road, sometimes it could not start even for 2 days. After two days it was fine, but once a while, it was losing power again. It could not start for one hour or two and again and again. So the car was not always getting gasoline because of bad one connector on the fuel pump. Best regards to you all. I hope you will have no more problems with Sonata.

I feel that most Sonatas has the same issue with bad connector on the fuel pump. This is why car is losing power sometime or can not start. After is OK,, but same problem appears back again, and again. So you need to change the fuel pump. Regards!

Many have thought that their Sonata was "fixed" only to find that the issue started again. Since the problem is intermittent, and may start for weeks in a row before any repairs, please update us in 2 months and tell us how it is going.

Hello. My car was fixed 11 months ago. Since this time I never had any problems. Starts and go smoothly. ROWLEYS in Windsor, CT specializes in car electronics and he is the best! He said right away that there will be no more “ check engine light” on the board. He was right! I am sure these Sonatas have the same issue with bad connector on the fuel pump. He did 3x different test and he knew that fuel pump is partially bad. WOW! He is the real Master! Regards!

I recently had similar problems with my 2007 Sonata 3.3. One morning I went out to start it after driving it home the night before, and it wouldn't crank. I heard a good strong click but nothing happened. Dash lights stayed bright (which is inconsistent with a weak/dead battery) so I figured it must be the starter. Pulled the starter and took it to Advance Auto. It tested good. Reinstalled the starter. Decided to try jumping it just to verify. Wouldn't crank in Park but managed to get it to start in neutral after a few failed attempts. I thought it might be the neutral safety switch. Went back to Advance Auto, bought a switch, and quit for the night. Next morning, I decided to try starting it just to verify it wasn't working. It started in Park on the first attempt. Decide to read some more here online. I remembered the starter pigtail connection sliding in and out very easily. I thought be the source of the problem. I pulled the starter back out, squeezed the connector closed slightly with needle nose pliers, and reinstalled. It's been a week. No problems since.

I have a 2001 Santa Fe, I found that my starter relay lost it’s negative. I set it up outboard of it’s socket with it’s own negative and car starts no problem

If you’ve recently replaced battery and turning key does not give power. Pull the battery cables off. Clean them then reattach well. This resets the car alarm system and brings power back to ignition.

I have an 09 Zahra, had the same problem! So I read this thread prior to putting any parts on it and as I see, a lot of you are getting driven crazy by this problem. Again, having the same problem, intermittent starts whenever it felt. the only clue that I had throughout this entire ordeal, Is one day when it would not start I had a friend with me in the hoodOpen. I sat there and jiggle the key, put it in park and neutral and back and park again, moved the steering wheel, and then all of a sudden… It started!But as it started, my friend looked around the hood at me and said There was a tiny curl of smoke that came out from inside the engine compartment… I’m sure most of you already know where I’m going with this at this point. It’s the starter. Sometimes, when the starter is getting old or worn, the brushes do not make proper contact and that’s why these intermittent problems have no pattern. Sometimes they’re making good contact, sometimes they’re not. Anybody who knows anything about electricalComponents that use brushes, you know brushes have to be in good shape in order to power your tool or any other component. And just like a tool, the starter has brushes inside of it as well. The motor is going around inside around these brushes, or insid the brushes, and just like And eraser on a pencil,these brushes get worn. Sometimes you will have good contact and other times you won’t as they start to wear, that’s why there is no pattern in the starting/non-starting issue. I’m not saying that that’s exactly why the starter is not working but that is the most common problem with starters or electrical components that have brushes when they get old. That’s why a lot of tools actually come with an extra set of brushes for their electrical motors. After ripping my starter apart, that’s exactly what the problem was… Brushes are worn!

My son has a 2008 Sonata and had a problem recently where it would not start... nothing at all happening when he turned the key in the ignition but there was power to things like radio, lights, etc. did the normal diagnostics and battery, fuses, relays all check out. He had it towed to a mechanic and they found some anti theft device was loose. Once they resolved that it starts fine. I haven’t seen the car yet since it has been at the mechanic so I haven’t seen where that is exactly but something to add to the checklist. I hope this helps someone in the future

To those of you reading this take a listen, my neighbor started having this issue with his at 110k so he brought it over to me. Turns out the security system goes wonky over time and doesn't deactivate like it should (it has a 10-20 minute delay). The answer is this IF YOU LOCK THE CAR WITH THE KEY FOB YOU HAVE TO UNLOCK IT WITH THE FOB AS WELL, DO NOT USE THE KEY OR THE CAR GOES INTO THEFT PROTECTION. It works vice versa too because the keys in these cars do not have a chip, so if you lock it with the key you have to unlock it with the key. Basically if you lock it with the fob the security is activated but when you go to unlock it with the manual key there is no RF chip so it can't deactivate the security signal sent by the fob. That's why disconnecting the battery will "fix" the issue for awhile, same with all the other "repairs" because it's not mechanical it's an electrical gremlin in the theft system...good luck!

Has anyone with no start/no crank, no click, nothing, checked signal wire to solenoid (small wire) not shielded (spade connection on solenoid) could be as simple as bad connection or corroded wire/connection.

The starter of my 2007 Sonata will not operate when I turn the key. If I get out and rock the car forward and backwards it will then start. What is the deal?

2010 Sonata Limited. 120k miles. New bottom end etc at 90k miles. Persistent, but intermittent issues with not starting. It would click, sometimes double-click, and if I spammed the starter button long enough it would eventually start. Took it in to get a new starter. They replaced the battery and alternator (because the alternators on these run at a lower voltage than most cars???). Issue persisted, and got more consistent. Replaced starter. Issue became worse. Had a friend spam the start button while I looked/listened/smelled for a bad connection. Found that the neg cable from the battery to frame was sparking at the frame. Took it off and the bolt was blackened. Sanded spot on frame, bolt, wire connector, put on some die-electric grease, reassembled. Started on first try. Tried it several times since and seems to be working fine.

2007 Sonata V6 3.3L. Been having the no crank, but battery has plenty of power issue for a few years. There is no regular pattern to the problem. It could work for days, weeks, months, then just leave you stranded by not starting. This never happened while driving, but it could happen in the middle of a day of running errands. I'm NOT a mechanic so forgive my explanation. I've had the car with no issues for a few days. Items addressed: replaced the starter and the neutral/safety switch. The mechanic said the car would still not start. They said that they determined when the key was turned, it was supposed to send power through two systems, one of which was the ANTI-Theft system. Because the power was not getting to this system, the car would not attempt to start bc it "thought" it was being broken into. They replaced a fuse or two and I have not had any problems. I'm not sure if the new starter and N/S switch were needed, but they are not that expensive in the grand scheme. I have read some good suggestions on this thread. The anti-theft system, and perhaps the Key FOB vs manual key usage is likely the issue. Note, for about a year, my key fob stopped working and I have been locking/unlocking my car manually with the key in the door. I have had this overall issue with no start both before and after the loss of my key fob. Hope it is resolved for good.