Home · 2018 GMC Sierra 2500 Hd · Complaints
These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.
3 of 35 complaints match · Transmission & drivetrain · clear filters
2018 GMC SIERRA 2500. CONSUMER WRITES IN REGARD TO TRANSMISSION COOLER LINES RECALL. THE CONSUMER STATED THE VEHICLE BEGAN LEAKING FLUID. THE VEHICLE WAS TAKEN TO THE DEALER TO HAVE THE VEHICLE REPAIRE, WHICH COULD NOT BE DONE THE SAME DAY. THE CONSUMER WAS SEEKING REIMBURSEMENT FOR THE HOTEL EXPENSE, SINCE THE CONSUMER WAS TRAVELING OUT OF STATE WHEN THE FAILURE OCCURED.
NHTSA ODI 11474048
WHILE TRYING TO MERGE ONTO THE INSTERSTATE MY TRUCK STARTED LOST POWER AND STARTED TO CHUG. MY TRUCK SLOWED DRASTICALLY WHICH CAUSED A TRACTOR/TRAILER TO ALMOST RUN INTO THE BACK OF ME. THIS HAS BEEN AN ONGOING ISSUE THAT MY DEALERSHIP HAS ADDRESSED BY REFLASHING MY COMPUTER. TO MY KNOWLEDGE THE FIRST FLASH WAS FOR THE TRANSMISSION AND THE SECOND TIME WAS FOR THE FUEL INJECTORS. THE REPROGRAMMING HAS NOT FIXED THE ISSUE. I WAS TRYING TO MERGE WITH TRAFFIC ON I 80 IN UTAH
NHTSA ODI 11289536
TRUCK BEGAN ROLLING DOWNHILL WHILE THE VEHICLE WAS IN PARK WITH THE KEYS OUT OF TGE IGNITION. I WAS REMOVING A CHILD SEAT FROM THE PASSENGER SIDE REAR SEAT AT THE TIME. SPOUSE WAS ABLE TO HURRIEDLY JUMP INTO THE VEHICLE AND APPLY THE BRAKES.
NHTSA ODI 11151083
Working with the data? Download all 35 complaints as CSV · fetched from NHTSA July 19, 2026