2022 GMC Sierra brakes problems
moderate 17 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
The failure pattern owners describe
Owners report two distinct brake system failures: integrated trailer brake controller malfunctions and primary brake system faults.
Trailer brake controller failures are the dominant complaint. Owners with factory-installed brake controllers on Max Towing packages report repeated "Check Trailer Wiring," "Trailer Brakes Disconnected," or "Service Trailer Brakes" warning messages that disable trailer brakes mid-tow, even with properly functioning trailers. One owner eliminated the trailer as the cause by building a brake emulator; another had a trailer repair shop confirm no trailer defects. GM has issued PIT5948A (DTC C159C) and PIT5509H documents, but dealers state these bulletins contain no known corrective action. Multiple owners report repeated dealership visits with misdiagnosis—blame shifted between truck wiring, canopy, trailer plug, and trailer itself over months. Owners describe situations where trailer brakes disengaged while towing in mountains or at highway speed, forcing reliance on truck brakes alone to slow loaded trailers.
Primary brake failures include brake pedal going to the floor with zero deceleration while driving (reported at 45 mph, 70 mph), occurring as early as 9,700 miles and at 20,000+ miles. Repairs involved electronic brake control module replacement and master cylinder replacement. One truck experienced two master cylinder failures within warranty. Another master cylinder leaked fluid inside the cab. Rear brake pad and rotor failures occurred at 16,000–22,000 miles. Owners describe near-collision scenarios with no stopping response.
Same GMC Sierra brakes reports on nearby years: 2019 · 2020 · 2021
Failure modes owners describe
Integrated Trailer Brake Controller Disengagement
Factory-installed brake controller on Max Towing package repeatedly disengages trailer brakes during towing, triggered by error messages. Owners report the truck's system falsely identifies trailer wiring faults and disables brakes, even when trailer brakes are functional and wiring is correct. One owner built a trailer brake emulator to rule out the trailer; another had a professional trailer shop confirm no defects. GM bulletins PIT5948A (DTC C159C) and PIT5509H acknowledge the issue but provide no known corrective action.
When: During towing; reported at low miles (1,200 miles noted) through higher mileage; one owner over 14 months of repeated failures
Symptoms owners cite: Intermittent 'Check Trailer Wiring' message before brake disengagement; Message escalates to 'Trailer Brakes Disconnected' or 'Service Trailer Brakes'; Trailer brakes completely disabled for remainder of ignition cycle; Alternating disconnect/reconnect messages during towing; Loss of trailer brake function despite trailer being operable
Codes mentioned: C159C
Repairs/costs cited: Dealers attempted repairs: replacement of trailer plug (ineffective), inspection of truck canopy wiring (ineffective). One owner cited obscure GM bulletin that service reps were unaware of. No confirmed repair found across multiple dealer visits. One owner paid $166 diagnostic fee at dealership.
Recalls/TSBs owners mention: GM issued PIT5948A (October 6, 2022) and PIT5509H diagnostic documents; however, PIT5948A explicitly states no known corrective action. Multiple owners report dealers citing 'no recall' and stating the issue lies with the trailer, not the truck, despite evidence otherwise.
Complete Brake Pedal Failure—No Response
Brake pedal depressed but vehicle does not decelerate or respond. Pedal goes to the floor or extends fully with zero braking effort. Multiple owners describe near-collision or collision-avoidance scenarios at highway and moderate speeds. Check engine, ESC, trailer brake, and brakes warning lights illuminate during or after the event.
When: At 9,700 miles; 20,000 miles; 45 mph and 70 mph operating speeds; one event at undisclosed speed
Symptoms owners cite: Brake pedal travels to floor with no resistance or response; Complete loss of deceleration at speed; Check engine light, ESC warning, trailer brake warning, and brakes warning lights illuminated; Service Vehicle warning light displayed; Vehicle coasts to stop or requires shoulder evasion to avoid collision
Codes mentioned: C159C (trailer brake component)
Repairs/costs cited: Dealers replaced electronic brake control module; one truck also had master cylinder replaced. One owner experienced a second brake failure immediately after returning the truck from master cylinder repair.
Recalls/TSBs owners mention: Manufacturer notified on multiple cases. Repairs performed under warranty at early mileage (9,700–20,000 miles). No broader service bulletin or recall issued in narratives.
Master Cylinder Failure
Master cylinder failed prematurely, requiring replacement under warranty. One truck experienced two master cylinder failures; another's master cylinder leaked brake fluid into the driver's footwell.
When: Below 10,000 miles for first failure; second failure occurred after dealer repair and return
Symptoms owners cite: Brake system failure requiring master cylinder replacement; Brake fluid leak inside cab on driver floor; Brake warning lights and service messages
Repairs/costs cited: Warranty replacement of master cylinder. One owner reported paying approximately $5,000 out of an $11,000 repair bill, but that repair was for engine rods and camshaft, not brakes; warranty covered master cylinder at low mileage.
Recalls/TSBs owners mention: Warranty coverage applied for master cylinder replacement at low mileage.
Premature Rear Brake Pad and Rotor Wear
Rear brake pads and rotors failed and required replacement at relatively low mileage. One owner reported rear brake pad failure; another reported rear brake rotor and pad failure.
When: At 16,000 miles and 22,000 miles
Symptoms owners cite: Service brakes monitor warning light illuminated; Dealer diagnosis: failed rear brake pads and rotors
Repairs/costs cited: Replacement of rear brake pads (and rotors in one case). One repair was completed at no cost under warranty; another was not repaired per narrative.
Recalls/TSBs owners mention: Manufacturer notified. One case covered under warranty at no cost; another case received no manufacturer assistance per owner statement.
Poor Brake Stopping Power Under Load
Owner reports the vehicle has extremely poor stopping power and dangerous braking performance when towing, raising concerns about design deficiency.
When: During towing preparation; no specific mileage stated
Symptoms owners cite: Extremely poor stopping distance; Inadequate brake response while towing; Owner concern of design error
Synthesized from 17 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Common questions
How serious is the brakes problem on the 2022 GMC Sierra?
It's a documented issue but not catastrophic. 17 complaints have been filed. Repairs average $450 and most owners catch it before it causes a breakdown.
At what mileage does the brakes typically fail?
Based on the 17 complaints filed, brakes issues most often appear around 18,980 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $450 for brakes repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to brakes?
No active recalls currently cover brakes issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.