GMC Sierra 2500 Questions Maintenance & Repair

2003 Sierra 2500 Transmission Issues

I have a 2003 gmc sierra 2500 6.0 4l80e 4wd, tach and speedometer don’t work, the truck itself, when viewing live data, doesnt register how fast its going. All speed sensors ohm out to 1.39-1.42 oh...

2003 Gmc Sierra 2500 Transmission Issues

I have a 2003 gmc sierra 2500 6.0 4l80e 4wd. Ive had issues with two transmissions with it shifting hard, no speedometer or rpm gauges, and no start by key. Replaced neutral safety switch, checked ...

2003 Gmc Sierra 2500 Transmission Issues

I have an 03 gmc sierra 2500 6.0 4wd, Ive had this issue with two transmissions now, speedometer and rpm gauges show 0, the truck is shifting hard, ive tested 3 sensors that i have ( the truck is o...

My 2001 Sierra Pickup Truck Won't Start

truck won't start. Can sitting for months not running it cause this problem

Injectors Won’t Spray

I stuck the battery in backwards like a moron and now the injectors won’t spray I put a new computer in it and a relay and a pump and a filter and there is fuel pressure up to the throttle body bu...

Driver Door Ajar

I have a 2003 GMC truck, getting message , Driver door ajar and something is running down my batteries

92 Gmc

The pickup wont stay running it will start then lose spark after about 30 seconds to a minute I've replaced the whole fuel system and ignition system except the ecm what could cause this?

98 GMC 7.4 Rebuilt Recommended Oil Grade

I just had my 98 GMC 7.4 motor rebuilt. The grade on the oil cap is 5-30. The guy at the rebuild shop recommended 20-50. I live in the San Joaquin valley in California where it's a 100 plus all summ...

My 1999 GMC Sierra Classic Usto Run On E10 But Now When I Put It In, It Doe...

Rattling Coming From Front Of Truck

My truck is making a loud rattle while idling. It sounds like something is loose but, I've checked and can't find anything that needs tightening. If i rev to 3000 rpm it stops briefly but, starts b...

Shifting Hard

My 95 sierra k2500 4x4

Fuel Issue

Have a 2000 gmc k2500 with the 5.7. Just changed the fuel pump and fuel filter. It ran great for roughly 2 hours then began to spit and sputter and backfire through the intake. Barely limped it hom...

Headlights Won't Work

The headlights in my GMC Sierrra 2500 stopped working for some reason. I just had the alternator replaced, and when I got in to drive it that night, the headlights wouldn't turn on. However, the da...

99 5.7 Vortec

I have a 99 gmc c2500 with a 5.7 vortec. I pulled the motor and dropped 4000$ into parts. Corvette crank cam pistons and heads. Got it running great till last week when I cold start and try and tak...

There Is A Lock Icon On My 2003 Sierra 2500 Dash. The Truck Won't Do Anythi...

Truck was showing RFA low battery. Truck locks went on and off several times and then shut the truck down. Truck now has padlock icon on dash and won't respond to the key. Put a new battery in fob...

Chevy 350

Can I take a 350 out of a 1990 and swap it into a 1973 gmc?

Rebuild

I want to rebuild my 1999 GMC Sierra to be like new.

Won't Shift From 2nd To 3rd Gear

When driving & once it's in closed loop it won't shift from 2nd to 3rd gear. Already replaced tps,vss. Anyone know what I should check next?

Brake Lights

I’ve checked the fuse, bulbs, and wires under the steering wheel but the brake lights still won’t work. All of the other lights work on the truck

Vacuum

Looking vacuum at half throtel