*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Electrical system
My truck is affected by GMâs engine blockâheater safety recall (NHTSA 21Vâ496 / GM N212329840) addressing a risk of short circuit and potential engineâcompartment fire at the heater cord/terminal connection. GMâs interim action has been to remove/disable the blockâheater cord, which my dealer did, and then marked the recall âcompleted.â As a result, the NHTSA VIN tool shows 0 unrepaired recalls, even though no actual repair/restored functionality exists and GM continues to advise owners not to use the block heater until parts are available. Safety concern / impact: I live in a coldâweather area and purchased this diesel expecting a functioning block heater for reliable…
Mar 4, 2021Power train
The contact owns a 2017 GMC Sierra 3500. The contact stated that while shifting from park(P) to drive(D), the engine revved, but the vehicle failed to move forward. There were no warning lights illuminated. The vehicle was towed to a certified mechanic, who determined that the vehicle needed to be diagnosed by a dealer. The mechanic was able to shift the transmission into manual drive mode, allowing the contact to drive the vehicle to the residence. The dealer was contacted and informed the contact that the VIN was not under recall. The vehicle was not repaired. The manufacturer was informed of the failure and referred the contact back to the dealer for assistance. The failure mileage was…
Sep 4, 2025 · 120,000 milesPower train › Axle assembly
The contact owns a 2017 GMC Sierra 3500. The contact stated while driving 30 MPH, there was smoke and a squealing sound coming from the passengerâs side rear wheel. The vehicle was taken to the residence and the contact observed fluid on the axle tube. The contact stated that the axle as taken apart and the wheel bearings were in pieces. The contact stated that the axle nut had unintendedly backed off. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 25,000.
Jun 4, 2025 · 25,000 milesService brakes
Trailer brake system connection warning Intermittent when towing it will say trailer not connected, while still having a secure 7 pin connection. This causes me to loose trailer brakes. My camper is nearly 14,000 lbs. Very dangerous situation. Happened since new. Was into / complained to GM service dept over 6 times.
Apr 29, 2025Engine
this vehicle is garage kept and meticulous maintained, has 136,000 miles, original owner, brought to dealer for an oil leak, they said exhaust are frozen and won't come out after heating etc. they have to replace exhaust manifolds! Bolts should not seize is the head of a garage kept vehicle that's heated! Being a mechanic many years ago I have never seen this happen! this is the first year for the new engine, On a internet search I found it's not uncommon, and the bill is going to cost me over $8000 !. Thank you, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Jan 2, 2025Power train
tHE 6L90 TRANMISSION FAILED WITH NO WARNING AT 58,408 MILES. HAD TO BACK THE TRUCK UP IN TRAFFIC OVER 1/2 MILE TO REACH A SAFE SPOT. SEEMS GM IS HAVING A LOT OF PROBLEMS WITH THIS TRANSMISSION AND THEIR 8 SPEED TRANSMISSION. NO ASSISTANCE FROM GM TO REPAIR SEEING I WAS OUT OF THE 5 YEAR 100000 WARRANTY. SEEMS GM KNOW ABOUT THESES PROBLEMS. HAD TO SPEND $5K TO GET NO DEALER SERVICE TO INSTALL A REMANUFACTURED TRANS, HOPING IT WILL NOT HAPPEN AGAIN
Jul 5, 2024Service brakes
SERVICE TRAILER BRAKING SYSTEM. Faulty control in the dash. Known issue per mechanic but no recall issued. Safety issue as trailer brake may not function properly when towing as a result
Feb 1, 2023Service brakesCrash
Brake are very spongy all the time weâll While driving in parking lot at low speed we lost brakes happen to hit person in front. This has been a continuous problem to point we are scared to even use the truck to go to store. Took it to Firestone. They told me it was the master cylinder. So they replaced that, replaced the front rotors and pads, did a fluid exchange abs as well? Donât know what that is. On the internet there is tons of this issue. I even see GMC 1500 is having this issue and there is a recall for the recalibration electric brake controller? Couldnât it include the full Sierra line?. Why not on the 2500, 3500? Looks to be same system? Rotors and calipers are different…
May 8, 2022
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.