2017 GMC Sierra 2500HD: Drivers seat moves when trailer brake power is increased
Common wear/failure (not a recall)
Symptoms
Owners of the 2017 Sierra 2500HD report: drivers seat moves when trailer brake power is increased. CarComplaints.com lists 1 owner complaints, average mileage 52,000 miles.
NHTSA has 12 owner complaints for the 2017 Sierra 2500HD in this area. Examples:
- NHTSA complaint ODI #11553927 (filed 11/07/2023): “The contact owns a 2017 gmc sierra 2500. the contact stated that while his wife was driving at an undisclosed speed, the vehicle experienced a loss of power steering assist, and the brakes failed to stop the vehicle immediately. no warning light was illuminate…”
- NHTSA complaint ODI #11466124 (filed 05/25/2022): “We were at a restaurant with friends we got back into the vehicle. i started up the vehicle and several electrical things happened. the service trailer brakes message came up, then the service power steering message came on. the engine was running but the t…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: none clearly reported. Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Moderate
Finding and splicing chewed wiring is doable with a multimeter and patience but can be time-consuming; harness replacement is pro work. (Our assessment.)
Cost
No sourced cost range: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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