Hummer EV Seat Heater Failure at 78K KM Needs Fix

I faced similar issues with my 2018 GMC Hummer EV just months ago. The seat warmer system failed completely on the drivers side, showing error codes related to the thermal sensor malfunction. The heating element was damaged due to normal wear patterns in the seat cushion. The automotive repair involved replacing both the heating mat and thermal sensor assembly. This repair requires specialized knowledge since accessing the heating elements means carefully dismantling the seat without damaging the surrounding upholstery. The job is quite involved, takes around 4-5 hours for proper heating repair as the technician needs to: Remove seat assembly, Replace damaged heating element, Install new thermal sensor, Test resistance values, Verify proper operation This is considered a serious repair since improper installation can lead to further electrical issues or safety concerns. Make sure to find a shop that specifically lists experience with EV heating systems, as the voltage systems differ from conventional vehicles. Since the failure happened at similar mileage to yours, this could be a common wear point for these heating systems. Consider having both seats inspected even if only one shows symptoms.

Thanks for sharing your experience with heater failure in your Hummer. Your description matches my situation exactly, especially the thermal sensor issues. The repair seems pretty extensive. Would you mind sharing how much you ended up paying for the seat heating fix? Also curious if youve had any other problems with the seat warmer system since the repair was done? Just want to budget properly and know what to expect.

Had the repair done last week, total cost was 390 Euro for fixing the seat heater defective. The repair included replacing both the heating mat and thermal sensor components. Happy to report the seat warmer is working perfectly now with no error codes. Since the fix, the heating system operates just like new, consistent warmth distribution and proper temperature control. The repair shop confirmed the original heater failure was due to a common wear pattern in these models. They suggested having the passenger side checked preventively, but so far that seat warmer is working fine. For the cost breakdown: most of the expense went toward the heating mat replacement, while the thermal sensor was a smaller portion. The labor was significant since they had to carefully work through the seat cushion assembly. Worth every euro though, the seat heating works even better than when the car was new.

I called a certified EV repair shop last week after getting the helpful advice here. The thermal sensor replacement and seat heater repair went smoothly, total bill came to 425 Euro. The technician was thorough and explained every step. They found the same issue in the seat cushion you mentioned, where the heating element had worn through. The heating repair took about 4 hours, but they did a great job preserving the upholstery while accessing the components. The seat warmer system has been working flawlessly since the fix. Temperature control is precise and the heat distribution feels more even than before. Definitely worth finding a qualified shop that understands EV heating systems. Also had them check the passenger side seat heater while they were at it, everything looks good there. Really glad I got this resolved before winter. Thanks again for helping me avoid another frustrating repair experience.