2026 GMC Terrain problems & reliability
23 owner complaints filed with NHTSA for the 2026 GMC Terrain, alongside 1 safety recall campaign. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
1 complaint report injuries (1 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Unknown OR Other | 7 | 30% |
| Power Train | 4 | 17% |
| Wheels | 4 | 17% |
| Forward Collision Avoidance | 3 | 13% |
| Service Brakes | 3 | 13% |
| Steering | 3 | 13% |
| Suspension | 3 | 13% |
| Structure | 2 | 9% |
| Electrical System | 1 | 4% |
| Engine | 1 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 12 reported components →Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
What owners report
“The Screen calls my own phone number and hangs up over and over if I just ended a call. I am not able to use any part of the screen afterwards such as my map. It stays like that until I disconnect the Bluetooth and wifi from my phone while trying to drive. Safety issue!”
Unknown OR Other · filed Jul 7, 2026
“This vehicle was bought new and is a NEW 2026 GMC TERRAIN DENALI with less than 5,000 miles at this time. It is a continuous event and not a specific failure date, but began soon after purchasing. The specific parts are UNKNOWN. It could be tires, wheels, steering parts (CV JOINTS, CONTROL ARMS ETC) or possibly…”
Steering · filed Jul 4, 2026
“The contact owned a 2026 GMC Terrain. The contact stated that while her husband was driving on a perpendicular road at an undisclosed speed, entering a highway, the driver yielded; however, a truck in the median was attempting to cross the highway during oncoming traffic, and an oncoming vehicle crashed into that…”
Structure · filed Jun 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
153 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2026 GMC Terrain. The 10 most recent:
• Smoother vehicle startups in cold temperatures
19.00 · Over The Air · issued Aug 1, 2026
This PI advise dealers If U3000 is present, follow the correct service doc by Symptom Byte before contacting PQC; if not present, verify the camera is clean, then contact PQC if no issue is found.
PIT6517C · Service Bulletin/Repair Instructions · issued Jul 30, 2026
PI to help diagnose A/C concern
PIT5099J · Service Bulletin/Repair Instructions · issued Jul 21, 2026
This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.
PIT5966F · Service Bulletin/Repair Instructions · issued Jun 23, 2026
• Improvements to the performance of driver assistance features • Fixes to help ensure accurate driver display messages and alerts
662.20 · Over The Air · issued Jun 23, 2026
This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians…
PIT6503B · Service Bulletin/Repair Instructions · issued Jun 17, 2026
• Fixes to help prevent loss of functionality for connectivity features such as OnStar, Wi-Fi, Navigation, and Super Cruise.
N25-252332 · Over The Air · issued Jun 16, 2026
This PI communicates a possible speedometer and/or odometer error due to an error in the parts catalog
PIP6121 · Service Bulletin/Repair Instructions · issued Jun 10, 2026
This Preliminary information communicates to technicians to remove the pulley assembly and inspect the drive chain and pulley surfaces.
PIP6033B · Service Bulletin/Repair Instructions · issued Jun 8, 2026
This PI addresses leaks from the case half and provides repair direction to dealer technicians
PIP6031E · Service Bulletin/Repair Instructions · issued Jun 5, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2026 GMC Terrain has 1 NHTSA recall campaign — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2026 GMC Terrain?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.