2018 Gmc Terrain: Reliability Data

Source: NHTSA — 312 complaints
312
Total Complaints
15,615mi
Median Mileage
SERVICE BRAKES
Top Issue
22
Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

2,290 25th Percentile
15,615 Median Mileage
51,569 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

SERVICE BRAKES
62
ENGINE
49
POWER TRAIN
40
ELECTRICAL SYSTEM
33
UNKNOWN OR OTHER
33
AIR BAGS
13
FUEL/PROPULSION SYSTEM
11
VEHICLE SPEED CONTROL
8
SERVICE BRAKES, HYDRAULIC
8
ELECTRONIC STABILITY CONTROL (ESC)
7

Severity Assessment

22
Crashes
2
Fires
17
Injuries
0
Deaths

Sample Complaint Reports

"TL* THE CONTACT OWNS A 2018 GMC TERRAIN. WHILE DRIVING VARIOUS SPEEDS, THE DRIVER'S ALERT WARNING SYSTEM FAILED TO OPERATE AS INTENDED. THE VEHICLE WAS TAKEN TO AN UNKNOWN DEALER, BUT THE CAUSE OF THE FAILURE COULD NOT BE DETERMINED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND STATED THAT THE..."
"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 ..."
"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 ..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28