2019 GMC Sierra 2500HD: Abs stabilitrak trailer brake system warnings
Common wear/failure (not a recall)
Symptoms
Owners of the 2019 Sierra 2500HD report: abs stabilitrak trailer brake system warnings. CarComplaints.com lists 2 owner complaints, average mileage 17,900 miles.
NHTSA has 9 owner complaints for the 2019 Sierra 2500HD in this area. Examples:
- NHTSA complaint ODI #11752275 (filed 07/22/2026): “On 07/10/2026 at approximately 1:10 a.m., the parked and unoccupied vehicle caught fire while turned off. the vehicle had not been driven for several hours. a neighbor was awakened by the horn/alarm and popping noises, observed fire near the passenger-side cab…”
- NHTSA complaint ODI #11724160 (filed 03/13/2026): “Ui bulletin #161b is for years 2020 and beyond. but my 2019 is having the same exact issue and the gm dealer will not cover the work as stated in the ui bulletin #161b…”
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: maybe the brake controll module ? (1 reports). 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)
AutoZone · O'Reilly · Advance · RockAuto