There are 7 owner-reported powertrain & transmission complaints for the 2008 GMC Sierrain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
DASH IS CRACKED IN THE "COMMON PLACE" FOR THESE VEHICLES. CORNER ABOVE THE INSTRUMENT PANEL AND AT THE PASSENGER SIDE AIRBAG, THE TRANSMISSION IS ALSO A ISSUE, THE 3/4 GEAR PACKET HAS WENT OUT AND THE HOUSING INSIDE THE TRANSMISSION IS CRACKED, SO IT WOULD'VE BROKE SOON ALSO.
TL* THE CONTACT OWNS A 2008 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 5 MPH, THE VEHICLE STALLED. THE VEHICLE WAS RESTARTED, BUT THE FAILURE RECURRED AND CODE: P069-E ILLUMINATED. THE DEALER WAS NOT CALLED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND STATED THAT THERE WAS NO RECALL. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 130,000.
TL* THE CONTACT OWNS A 2008 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 40 MPH, THE VEHICLE LOST POWER. ALSO, THE TRACTION CONTROL, SERVICE ENGINE, AND REDUCED ENGINE POWER INDICATORS ILLUMINATED. THE VEHICLE WAS TAKEN TO THE DEALER (BETTEN BAKER BUICK, 2901 28TH ST, GRANDVILLE, MI, 49418, PHONE NUMBER: 616-530-9191) WHERE IT WAS DIAGNOSED THAT THE THROTTLE BODY NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND STATED THAT THERE WAS NO RECALL. THE CONTACT WAS REFERRED TO NHTSA. THE FAILURE MILEAGE WAS APPROXIMATELY 96,000.
WHILE DRIVING CHECK ENGINE LIGHT, SERVICE STABILITRAC AND SERVICE TRACTION CONTROL ON INFORMATION CENTER, FOLLOWED BY A REDUCED POWER NOTIFICATION. THIS CLEARS AND OCCURS WITHOUT WARNING RENDERING THE MV NEAR USELESS. *TR
TRANSMISSION LINES LEAKING AROUND CRIMPED PART OF LINE. RESEARCHING THIS ISSUE ONLINE,MANY GMC/GM VEHICLES ARE HAVING THIS ISSUE. THERE SHOULD BE AN EFFORT BY GM TO INSTALL BETTER LINES. *TR
MY VEHICLE HAS A THUMP WHILE APPLYING AND RELEASING THE BRAKE PEDAL AND THE MANUFACTURER HAS TRIED TO REPAIR THE DRIVE LINE/ SHAFT SEVERAL TIMES. NOW THE MANUFACTURER IS SAYING THAT THERE IS NO REPAIR PARTS FOR THE PROBLEM THAT I'M EXPERIENCING. *TR
TL*THE CONTACT OWNS A 2008 GMC SIERRA 1500. AFTER THE CONTACT PARKED AND EXITED THE VEHICLE, IT BEGAN TO ROLL FORWARD IN HIS GARAGE. THE VEHICLE CRASHED INTO THE GARAGE DOOR AND THE CONTACT SUSTAINED INJURIES. HE TOOK THE VEHICLE TO THE DEALER AND THEY COULD NOT FIND ANY FAILURES. THE CONTACT CALLED GMC AND A REPRESENTATIVE CAME OUT TO TAKE PICTURES AND INSPECT THE VEHICLE. THE PURCHASE DATE WAS UNKNOWN. THE CURRENT MILEAGE WAS 27,000 AND FAILURE MILEAGE WAS 13,202.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026