Integrated Trailer Brake Control Problems of GMC Sierra 3500

The contact owns a 2024 GMC Sierra 3500. The contact stated while driving at approximately 60 mph and towing a forest river riverstone legacy 5th wheel trailer, the brake pedal was depressed to slow for oncoming stopped traffic; however, the vehicle failed to respond as needed with the “service trailer brake” warning light illuminated. The contact was able to stop however, the brake pedal had to be depressed to the floorboard to slow the vehicle. The contact had taken the vehicle to a local dealer and was made aware of customer satisfaction program: n232414840 - and replaced the trailer brake power module (tbpm). The vehicle was repaired; however, the failure reoccurred. The contact returned the vehicle to the same dealer and the trailer brake power module was replaced a second time. The vehicle was repaired; however, the failure reoccurred. The contact had taken the vehicle to another dealer who diagnosed the vehicle and determined that the failure was with the 5th wheel RV. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 20,000.

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The contact owns a 2024 GMC Sierra 3500. The contact stated while driving at various speeds and hauling a trailer, the message "trailer brake disabled - service required" was displayed. The vehicle was taken to the dealer, where it was diagnosed and determined that the failure was related to TSB number: 23-na-113; however, the part to do the repair was not yet available. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 2,390.

The contact owns a 2022 GMC 3500. The contact stated while the vehicle was parked, the trailer plug was connected, and electrical fuses popped. The contact stated that all the fuses were blown. In addition, the contact stated while driving the vehicle, the trailer brakes did not function as intended. The contact stated that the trailer brakes went off and on. The vehicle was taken to the dealer where it was diagnosed with a failed trailer brake control module. The contact was informed that the trailer brake control module needed to be replaced. The vehicle was repaired. The contact referenced an unknown recall repair which had a similar failure description, however the contact's VIN was not associated with the recall. In addition, the contact stated that the failure originally began in March 2024, however an unknown part was replaced, but the failure reoccurred. The manufacturer was not made aware of the failure. The failure mileage was approximately 31,308.

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The contact owns a 2022 GMC Sierra 3500 equipped with a 2024 gatormade 35+5 trailer. The contact stated that while driving on several occasions, the "check trailer wiring" message was displayed. Additionally, when the brake pedal was depressed however, the trailer did not slow as intended; however, the rear brake lights were illuminated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 40,000.

The contact owns a 2013 GMC Sierra 3500. While the vehicle was at the dealer for inspection, the check engine warning indicator illuminated. In addition "trailer brake system" was displayed across the message board. The technician diagnosed that the trailer brake system module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The contact was aware of NHTSA campaign number: 14v614000 (electrical system). The VIN was not included. The failure mileage was 5,000.

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Vehicle is equipped with factory integrated trailer brake control (itbc). Back in Jan. , 2011 I got a message in the driver information center (dic): it said "service trailer brake system". Message intermittent at first, and then more frequently , and then message appeared at start-up every time. Dealer fixed problem. In April of 2013 the same problem has returned in exactly the same pattern as the previous fault. This a faulty system at best, and has serious design flaws. The serious safety issue here when the "service trailer brake system" message appears on the dic; all trailer braking is lost. There is no default or back-up system in which to apply trailer brakes. Even the manual trailer brake control built into the itbc is also rendered inoperable. This itbc failure could happen at any time, and at any speed. This vehicle is rated to tow a trailer of 10,000lbs. Plus. Many peoples lives could be put in jeopardy if suddenly all trailer braking were lost on a steep downgrade. This itbc system needs to be re-designed so that a vehicle operator can operate the trailer brakes manually if automatic trailer brake control is lost when the operator gets a "service trailer brake system" on the dic.

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