2018 Gmc TERRAIN problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
219 owner complaints analyzed
5 distinct recall campaigns
18,250 mi median reported failure mileage
Scope: 2018 model year. Data snapshot: . 90 complaints include usable failure mileage.
Most common problems
Service Brakes is the most frequently named component, appearing in 68 of 219 complaints (31.1%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 90 | 41.1% |
| Transmission and shifting | 30 | 13.7% |
| Engine operation | 15 | 6.8% |
| Steering behavior | 12 | 5.5% |
| Electrical and battery issues | 8 | 3.7% |
| Fuel system concerns | 4 | 1.8% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Service Brakes | 68 |
| Engine | 53 |
| Power Train | 40 |
| Unknown Or Other | 34 |
| Electrical System | 33 |
| Air Bags | 13 |
| Fuel/Propulsion System | 12 |
| Service Brakes, Hydraulic | 11 |
Service Brakes: 68; Engine: 53; Power Train: 40; Unknown Or Other: 34; Electrical System: 33; Air Bags: 13; Fuel/Propulsion System: 12; Service Brakes, Hydraulic: 11
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 49 |
| 25,000 to 49,999 | 11 |
| 50,000 to 74,999 | 11 |
| 75,000 to 99,999 | 8 |
| 100,000 to 149,999 | 6 |
| 150,000 and above | 5 |
Under 25,000: 49; 25,000 to 49,999: 11; 50,000 to 74,999: 11; 75,000 to 99,999: 8; 100,000 to 149,999: 6; 150,000 and above: 5
Under 25,000 miles has the most reports with usable mileage (49). 129 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2017 | 2 |
| 2018 | 24 |
| 2019 | 28 |
| 2020 | 11 |
| 2021 | 17 |
| 2022 | 27 |
| 2023 | 28 |
| 2024 | 36 |
| 2025 | 25 |
| 2026 | 21 |
2017: 2; 2018: 24; 2019: 28; 2020: 11; 2021: 17; 2022: 27; 2023: 28; 2024: 36; 2025: 25; 2026: 21
Pattern summary
Service Brakes leads the component reports. Braking behavior appears in 90 complaint narratives. Transmission and shifting appears in 30 complaint narratives. Engine operation appears in 15 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11057250 · 2017-12-28 (December 28, 2017)
THE FIRST TIME WHILE DRIVING AT 60 MPH, THE VEHICLE INSTRUMENT PANEL WARNING LIGHTS ACTIVATED AND GAUGES FLUCTUATED FOLLOWED BY ACCELERATION, BRAKING AND STEERING MOVEMENT. THEN THE INFORMATION PANEL DISPLAYED STABILITRAK UNAVAILABLE, COLLISION WARNING UNAVAILABLE, LANE CHANGE ALERT UNAVAILABLE AND TRANSMISSION SERVICE. THE CAR THEN STARTED SHIFTING ERRATICALLY. THE 2ND TIME SAME SITUATION WHILE DRIVING 30-40 MPH.
Owner-reported narrative. 1,500 miles reported. Look up ODI 11057250 at NHTSA ↗
Owner report 11062141 · 2018-01-11 (January 11, 2018)
THIS CAR, A 2018 GMC TERRAIN IS EQUIPPED WITH AUTO START / STOP, A STANDARD FEATURE THAT TURNS OFF THE ENGINE WHEN BRAKE IS APPLIED, SUCH AS AT A STOP LIGHT. THE ENGINE TURNS OFF WHILE BRIEFLY STOPPED AT A STOP SIGN. THIS IS DANGEROUS AND A SAFETY ISSUE. WHILE ATTEMPTING TO PULL INTO A TRAFFIC LANE WITH THE ENGINE OFF, I HAVE EXPERIENCED AN UNSAFE LAG BEFORE THE ENGINE RESTARTS. GM HAS STATED, THE ENGINE CAN BE TURNED BACK ON BY REMOVING YOUR FOOT BRIEFLY FROM THE BRAKE PEDAL. SERIOUSLY ??? WHILE BEHIND ANOTHER VEHICLE, I WILL NOT FOLLOW THIS …
Owner-reported narrative. 248 miles reported. Look up ODI 11062141 at NHTSA ↗
Owner report 11091743 · 2018-05-04 (May 4, 2018)
STOPPED AT A LIGHT TO MAKE A LEFT TURN. THE VEHICLE JERKED, THEN SHIFTED FROM DRIVE TO PARK. THE INFO SYSTEM GAVE ME THE FOLLOWING MESSAGES: TRANSMISSION, STABILITRAK AND PARKING ASSIST. I TURNED THE VEHICLE OFF AND TRIED TO RESTART IT. I GOT A MESSAGE THAT SAID "THIS VEHICLE IS UNSAFE TO DRIVE.:" AT THIS TIME NON OF THE GEAR OPTIONS WERE AVAILABLE. A ROSEVILLE, MICHIGAN POLICE OFFICER HAD TO POSITION HERSELF BEHIND ME BECSUSE CARS WERE GOING AROUND ME ON BOTH SIDES (MY FOUR WAY BLINKERS WERE ON).THE TOW TRUCK DRIVER WAS UNABLE TO PUT THE…
Owner-reported narrative. 2,028 miles reported. Look up ODI 11091743 at NHTSA ↗
Owner report 11093442 · 2018-05-12 (May 12, 2018)
ADDITION TO REPORT 11091743. THE VEHICLE WAS SERVICED FOR WARNING OF TRANSMISSION, STABILITRAK, PARKING ASSIST AND NOTIFICATION THAT VEHICLE WAS UNSAFE TO DRIVE (MAY 2, 2018). VEHICLE PICKED UP (MAY 11, 2018) AFTER SERIES OF REPAIRS. I DROVE APPROXIMATELY 15 MILES AND THE VEHICLE BEGAN JERKING AND STALLING. AT THE FINAL JERK THE VEHICLE WENT FROM 35 MPH TO 5MPH AND WOULD NOT ACCELLERATE. THERE WERE SEVERAL LOUD NOISES AND A BURNING SMELL. THE VEHICLE HAD TO BE TOWED TO MY RESIDENCE. WHEN I PICKED UP THE VEHICLE FROM JIM CAUSLEY I ASKE…
Owner-reported narrative. 2,040 miles reported. Look up ODI 11093442 at NHTSA ↗
Owner report 11094166 · 2018-05-16 (May 16, 2018)
VEHICLE WAS IN SERVICE FOR 9 DAYS FOR- (AS IDENTIFIED ON THE INFORMATION SYSTEM) TRANSMISSION, STABILITRAK, PARKING ASSIST AND A MESSAGE "THE VEHICLE WAS UNSAFE TO DRIVE". ON FRIDAY, MAY 12, 2018 I PICKED UP VEHICLE FROM JIM CAUSLEY AFTER REPAIR AND REPLACEMENT AS INDICATED ON THE SERVICE REPORT. I DROVE NO MORE THAT 15 MILES AND THE VEHICLE JERKED, STALLED, MADE LOUD NOISES AND SMELLED OF SOMETHING BURNING. THE VEHICLE WENT FROM 35MPH TO 5MPH. THE VEHICLE WOULD NOT ACCELERATE BEYOND 10-15MPH. I HAD TO HAVE THE VEHICLE TOWED TO MY RESIDE…
Owner-reported narrative. 2,040 miles reported. Look up ODI 11094166 at NHTSA ↗
Owner report 11144540 · 2018-10-31 (October 31, 2018)
1. LANE DEPARTURE WARNING ONLY WORKS WITH HANDS OFF THE STEERING WHEEL.GM REFUSES TO FIX IT AS THEY SAID THEY DESIGNED THE VEHICLE THIS WAY. WHO IN THEIR RIGHT MIND DRIVES WITH HANDS OFF THE STEERING WHEEL, WE BOUGHT THIS FEATURE FOR OUR YOUNG DRIVERS TO HAVE THEM REMINDED IF THEY DRIFT OUT OF THEIR LANE. 2. WARNING WINDOW ABOUT DISTRACTED DRIVING DISPLAYS ON THE RADIO SCREEN WHILE DRIVING, SO YOU HAVE TO TAKE YOUR EYES OFF THE ROAD TO PUSH OK TO GET RID OF IT. GM REFUSES TO DO ANYTHING ABOUT THAT EITHER. 3. SEATBELTS ARE NON ADJUSTABL…
Owner-reported narrative. Look up ODI 11144540 at NHTSA ↗
Owner report 11154317 · 2018-11-27 (November 27, 2018)
TL* THE CONTACT OWNS A 2018 GMC TERRAIN. THE CONTACT STATED THAT THE VEHICLE'S ELECTRICAL SYSTEM FAILED. THE VENTS LOCATED NEAR THE INSTRUMENT PANEL EMITTED A STRONG BURNING ODOR WHEN THE HEATING SYSTEM OR AIR CONDITIONING SYSTEM WAS ACTIVATED. IN ADDITION, THE FRONT END OF THE VEHICLE EXHIBITED A STRONG VIBRATION THAT CAUSED THE STEERING WHEEL TO VIBRATE. FURTHERMORE, WHEN THE REAR HATCH DOOR WAS CLOSED, THE REAR HATCH DOOR LIGHT REMAINED ILLUMINATED. THE CONTACT STATED THAT THE REAR DRIVER'S SIDE HUB CLIPS SEPARATED. ON STAR PERFORMED A DIAGN…
Owner-reported narrative. 4,000 miles reported. Look up ODI 11154317 at NHTSA ↗
Owner report 11194565 · 2019-04-08 (April 8, 2019)
WIRING HARNESS NOT WEATHER SEALED N SHORTED OUT AFTER DEALER WASHED CAR ON DELIVERY
Owner-reported narrative. 10 miles reported. Look up ODI 11194565 at NHTSA ↗
Owner report 11435997 · 2021-10-08 (October 8, 2021)
Yesterday morning I noticed a smell of gas around my car. I looked and didn’t see anything. I drove to work. Once I got back to my vehicle after work I could smell gas as I approached my vehicle. I looked under my car and noticed a puddle of gas. I went to the gas station to put enough fuel for me to make it home in my vehicle and as I was putting the gas I noticed a drip under the vehicle. Once I got home and parked my vehicle I looked under the car and there was a rapid and steady drip coming from the fuel tank. The same make, mode and year o…
Owner-reported narrative. Look up ODI 11435997 at NHTSA ↗
Owner report 11547673 · 2023-10-02 (October 2, 2023)
The contact owns a 2018 GMC Terrain. The contact stated that while driving at approximately 35 MPH going over a hill, the brake pedal was depressed but was firm and failed to depress as needed. The engine power reduced message was displayed and flashed on and then off. The brake assist warning light was illuminated. The service transmission message was displayed. The contact continued to depress the brake pedal until the vehicle responded as needed. The driver was able to pull into a parking lot, and the vehicle rolled to a stop. While driving,…
Owner-reported narrative. 30,000 miles reported. Look up ODI 11547673 at NHTSA ↗