How do I reset passlock on 2005 chevy Trailblazer?

This may work: 1. Turn on the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON (vehicle will not start). look at 'security light', after approximately 10 minutes it should shut off 4. Turn off the ignition, and wait 5 seconds. 5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes/ The vehicle is now ready to relearn the Passlock Sensor Data Code The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6.Start the engine (the vehicle has now learned the Passlock Sensor Data Code and/or password).

I have a 2002 chevy trailblazer and the passlock is locked how can i restart my truck ! please help!

i tried your password sensor data code command with the steps 1-4 than repeated 3 x than did the off to crank thing but not working ?

i just did it on my 2003 trailblazer and it did work . the steps that davidh25 said to do follow it exactly what he said to do

I just did my truck wont start

DavidH25 wen i do the steps does first time count as 1cycle? An do i repeat the steps every 30 minutes?

I did it on my 04 trailblazer an it work...

I did it to my 04 trailblazer and won't do it either

We have a 2005 trailblazer. It sat idle for 2 years. Changed battery and numerous other items. Trailblazer runs, BUT the security light and hazards stay on....will doing this "passcode" thing fix?

I did it for my 2003 trail blazer, I put an used ecm from a 2002 vehicle and works perfect

i got a 2003 trailblazer . when I was working on it the ele shut down I thout it was the battery so put new one in . know when I turn the key I don't get enty light but the service light . I tried turning the switch on for 10 minutes but not getting sercurety light

Your screwed! Don't buy a chevy

My battery would run down after I killed the engine I drove it to the store head lights blink t w o times and shut the engine down I have no bright lights and all my other lights work but want start or turn over can I g st some help from someone may be

I need help with this too

Did anybody's key get stuck?

Mine did!? 04 trailblazer LT. Still figuring out. So MANY symptoms with not enough answers!? Had to put jumper cables on just to release the key! Cables taken off dies in the water?

Tried it won’t work I’m stumped need help

GuruF55HT Had same problem. I found switch under the dash under steering wheel. Flipped it and the security light stopped flashing and car started

Where is this switch because I can not find...I'm losing my mind here....ugh...good grief...

Under steering column

07 Trailblazer

Ok so for the most part he is right( key forward security blinks wait 10 mins, turn to off position wait five seconds. Repeat this for about four times “ do not start the vehicle until the last cycle thank you God bless everyone

07 Trailblazer. I can’t lock or unlock my doors and the key is stuck in the ignition. It all happened on Christmas Eve. It’s been a really good SUV until now so I’m not gonna complain to much.

dead battery ...linkage to shifter. grommet to replace..Dead battery locked my key also.there is a small rubber thing low on the column and i have ben told by a troll at bar.Well pop the plug a bottom and push a bottom and the key will come out. good luck Indigo angel