What 147 owners told NHTSA about the 2015 GMC Sierra 2500 Hd

Electric trailer brake control modular is malfunctioning on my 2015 GMC Sierra Denali 3500. Multiple of sources told me this is a common problem with this generation of GMC.

NHTSA ODI 11604778

Press the pedal feels soft vehicle slightly slows then pedal pressures up and truck instantly stops pedal stays hard for a long time having same issue on 15 tahoe

NHTSA ODI 11510446

The contact owns a 2015 GMC Sierra 1500. The contact stated her husband was driving when the vehicle in front of them applied the brakes unexpectedly, the driver depressed the brake pedal but failed to stop the vehicle due to the brake pedal being resistant/ rigid causing the vehicle to rear-end the other vehicle. The contact stated no warning light was illuminated. The air bags did not deploy. The contact stated no one was injured nor sought medical attention. A police report was filed. The driver was able to continue driving to their destination. The contact took the vehicle to the local dealer, where it was diagnosed that the vacuum pump had to be replaced. The dealer replaced the vacuum pump back in October of 2022. The vehicle was repaired but the second vacuum pump was also defective and the dealer replaced it on-site for a third time. The vehicle was repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 85,500. The contact stated that the failure speed was no more than 70 mph.

NHTSA ODI 11500249

Wife and daughter took the pickup to town. While returning home wife noticed a noise from the front end. She slowed down to turn and the whole tire with rotor came off the pickup causing the brake line to get ripped off and stating a fire. Damaged the running board and rocker panel along with the cv axle and other numerous parts.

NHTSA ODI 11458567

I WAS DRIVING IN MY CITY AND THE BRAKES WERE FINE PRIOR. I WAS COMING UP TO A STOP SIGN AND ALL OF THE SUDDEN MY BRAKE PEDAL WAS GOING TO THE FLOOR. I COULD NOT STOP WITHIN REASON. LUCKILY NO ONE WAS IN THE CROSSWALK OR I WOULD HAVE HIT THEM. I USED THE E-BRAKE AND MY EXHAUST BRAKE TO HELP SO ME SLOW DOWN. I WAS DOING ABOUT 35MPH. I TOOK THE TRUCK HOME IMMEDIATELY AS SAFE AS I COULD. I CALLED THE GM DEALERSHIP BY ME AND TOOK IT TO THEM. THEY ARE ONLY A FEW MILES AWAY AND I TOOK BACK ROADS TO AVOID TROUBLE. I WAS INFORMED BY THE GM DEALERSHIP THAT THERE WAS AN INTERNAL FAILURE OF THE BRAKE BOOSTER AND MASTER CYLINDER. $654.00 DOLLARS TO REPAIR MY 2500 DENALI TRUCK. I CALLED GM SERVICE ALREADY AND THEY INFORMED ME MY TRUCK WAS NOT UNDER THE RECALL. THIS ISSUE OBVIOUSLY EXISTS TO MORE VEHICLES THAN WHAT THEY SPECIFY AND YOU COULD LOSE BRAKES AT ANY MOMENT. GM NEEDS TO RECTIFY THEIR TRUCK BRAKE SITUATION. SOMEONE WILL END UP GETTING KILLED.

NHTSA ODI 11339900

TL* THE CONTACT OWNS A 2015 GMC SIERRA 2500. WHILE THE VEHICLE WAS BEING REVERSED WITH A TRAILER ATTACHED, THE BRAKE PEDAL WAS DEPRESSED, BUT FAILED TO OPERATE. THE CONTACT STATED THAT THE TRAILER CRASHED INTO THE AWNING OF THE RESIDENCE. THERE WERE NO INJURIES. UPON INSPECTING THE VEHICLE, THE CONTACT NOTICED EVIDENCE OF BRAKE FLUID LEAKING FROM THE BRAKE BOOSTER, WHICH ALLOWED BRAKE FLUID TO ENTER THE CABIN OF THE VEHICLE. THE VEHICLE WAS TAKEN TO PERFORMANCE CHEVROLET (LOCATED AT 3222 BEVERLY PIKE, ELKINS, WV 26241, TEL: (304) 591-1077) TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE BRAKE BOOSTER WAS LEAKING AND WAS 1,000 MILES OUT OF WARRANTY. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT CONTACTED OR NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 37,023.

NHTSA ODI 11005111

I HAVE BEEN HAVING A PROBLEM WITH THE TRAILER BRAKE CONTROLLER ON MY K3500 TRUCK. RECENTLY THE MESSAGE "CHECK TRAILER WIRING" HAS BEEN COMING ON FREQUENTLY. AT THE SAME TIME, THE BRAKING CONTROLLER SHUTS OFF POWER TO THE TRAILER BRAKES. THIS HAS RESULTED IN A VERY UNSAFE CONDITION, ESPECIALLY WITH A TRAILER THAT WEIGHS OVER 14,000 POUNDS. THIS HAS BEEN GOING ON FOR 6 MONTHS NOW. REPEATED ATTEMPTS BY BOTH THE GMC DEALER AND THE TRAILER DEALER HAVE FAILED TO RESOLVE THE PROBLEM. I HAVE BEEN TOLD, BY THE DEALER, THAT THE PROBLEM STARTED APPROXIMATELY WITH THE 2014 MODELS. THE BRAKE CONTROLLER HAS BEEN UPGRADED, AND MADE MUCH MORE SENSITIVE TO SLIGHT DEVIATIONS IN THE TRAILER SYSTEM, CAUSING THE CONTROLLER TO "SHUT OFF" SO TO SPEAK. WHILE THIS WOULDN'T BE A BIG ISSUE NORMALLY, WHEN IT SHUTS OFF, YOU LOSE ALL BRAKING ABILITY TO THE TRAILER RESULTING IN AN UNSAFE CONDITION. THERE IS NO WAY TO OVERRIDE THIS AND ACTIVATE THE BRAKES. WHAT SEEMS TO BE HAPPENING IS A VERY SLIGHT DEVIATION IN THE RESISTANCE IN THE TRAILER BRAKE SYSTEM (BY 1 OHM OR LESS) AND THAT CAUSES THE "SHUTDOWN" IN THE CONTROLLER. TRAILER BRAKES WOULD WORK, IF THEY COULD GET POWER. BUT, THE CONTROLLER HAS SHUT DOWN, SO NO POWER. MYSELF (AND THE TRAILER SHOP) HAVE BEEN CHECKING THE INTERNET AND FINDING THAT THIS IS NOT AN ISOLATED INCIDENT. IT APPEARS TO BE HAPPENING WITH ALL THE BIG THREE MANUFACTURER TRUCKS, SINCE ABOUT 2014. PEOPLE HAVE BEEN COMING UP WITH SOME RATHER "CREATIVE" WAYS AROUND THIS, IN SOME CASES ELIMINATING THE ORIGINAL SYSTEM ENTIRELY. THIS IS JUST NOT ACCEPTABLE. AGAIN, THIS "NEW SYSTEM THE BIG THREE ARE PUTTING IN IS FAR WORSE THAT THE OLD, SIMPLY BECAUSE IT HAS NO ROOM FOR FORGIVENESS IN A TRAILER SYSTEM THAT MIGHT WORK OTHERWISE, BUT HAS A SLIGHT DEVIATION IN WHAT IS CONSIDERED "ACCEPTABLE" TO THE CONTROLLER. AT THE VERY LEAST, THERE SHOULD BE A FAIL SAFE METHOD.

NHTSA ODI 10852825

TL*THE CONTACT OWNS A 2015 GMC SIERRA. THE CONTACT STATED THAT WHILE DESCENDING DOWN HILL AT NIGHT, THE LOW BEAM HEAD LIGHT PROVIDED POOR VISIBILITY. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 5. UPDATED 03/30/15*LJ UPDATED 06/23/2015*JS

NHTSA ODI 10690231

WHILE DRIVING, THE POWER STEERING HOSE CAME OFF CAUSING A SUDDEN LOSE OF FLUID RESULTING IN LOSS OF POWER STEERING AND POWER BRAKES. ALTHOUGH A RECALL/BULLETIN WAS TO BE ISSUED ON THIS PER THE DEALER (I CAN NOT FIND EVIDENCE OF A RECALL FOR THIS), MY VEHICLE WAS BUILT AFTER THE INCIDENT WAS RECOGNIZED AND THOUGHT TO BE CORRECTED. SUDDEN LOSE OF POWER STEERING AND POWER BRAKES IN A VEHICLE THIS SIZE WHILE PULLING A LARGE TRAILER COULD HAVE BEEN DISASTROUS. *TR

NHTSA ODI 10611408