2012 Chevrolet Silverado 2500: check engine light

Filed Apr 15, 2025 · Electrical, Transmission · DE

The vehicle's TCM has apparently failed as evidenced by CEL code "U0101", low power ("limp mode"), hard shifting, no gear selection indicator, and extremely slow acceleration. Vehicle is currently available for inspection, but will be receiving a replacement TCM soon. Myself and others' safety was put at risk due to my the vehicle's inability to continue through an intersection at a reasonable rate. The problem has not been reproduced by a dealer/service center, nor has it been inspected by anyone since the incident. The aforementioned warning lamp that indicated the issue appeared upon starting the vehicle, which drove normally for the first 11 miles.

Filed Feb 17, 2025 · Brakes, Electrical · IL

Day after driving to n a snow storm the vehicles stabilitrak and traction control light and message to service those came on the dash and a sudden lose of power. I pulled over and put it in park noticing the gear indicator on the dash was gone. I put in drive and could barely move. So I shifted to 1st gear then back to park and into drive and the light came off and it was back to normal. The next day I started the vehicle and the light was on again with the check engine light. And stuck in limp mode. There are forums I've read with thousands of people with the same problem. The vehicle is available for inspection. The safety concerns are the traction control and stabilitrak can affect the way it handles and brakes. The vehicle will be going to dealership. There where no warning light prior to. The lights and systems failed simultaneously. This vehicle only has 44000 miles on it, no rust the frame is mint. This is a very clean truck and shouldn't be having this kind of problem.

Filed Sep 18, 2020 · Engine · 60,000 miles · CA

Exhaust gas recirculation (egr) cooler bypass valve had to be replaced 60,000 miles. The check engine light came on while the car was in motion.

Filed Oct 5, 2018 · Engine · 41,000 miles · CA

Tl* the contact owns a 2012 chevrolet silverado 2500hd. While driving 55 MPH, the check engine indicator illuminated and remained lit. The vehicle was taken to john l sullivan chevrolet (350 automall dr, roseville, ca 95661, 916‑782‑1243) where it was diagnosed that the nitrogen oxide sensors failed. The manufacturer was notified of the failure and referred the contact to the federal safety agency. The failure mileage was approximately 41,000. *bf.. Updated 10/29/18*jb

Filed Aug 9, 2016 · Engine · 50,000 miles · TX

I have been having multiple glow plug failures on my vehicle. One right after another. It has gone to the dealer every single time for the repairs I even asked the dealer mechanic if I was the only one and he stated that there are many others with my issue with failing glow plugs. The dealer has a full record of all the issues iv had and every time my vehicle has been in their shop. Something has got to be done! Soon as I try to use my remote start the truck starts then dies then I get a check engine light so I call onstar they give me the code and sure enough its a failed glow plug. Then im unable to even use remote start features of my vehicle at this point.

Filed Jun 22, 2016 · Body, Engine · 40,000 miles · TX

Cracked front dash between airbag and window defrost vent, possible airbag deploy issue. Check engine light illuminates when first engine start or during use on my lml engine: repeat failing glow plugs, repeat nox sensor and def issues. There have been failing oat sensors, failed driver seat cooling fan(s), defective airbag deploy issue due to possibly poor connector seating. Engine glow plug usully occurs at or near initial startup. Nox fails when underway or near startup. Seat cooling failures have occurred twice. Driving is both city street and highway operation. Glow plug failures usually wherever I initiate startup. Dash crack, possibly affecting airbag deploy has not been warranted, rather, gm wants me to subsidize the repair/replacement of the dash