The 2021 Terrain has about average reliability compared to other cars from the same model year.
The Reliability score is based on our latest subscriber survey of 2021 GMC Terrain owners. The owner comments describe problems respondents experienced with this vehicle.
Cruise control, clock, warning lights, body control module, keyless entry, wiper motor or washer, tire pressure monitor, interior or exterior lights, horn, gauges, 12V power plug, USB ports, alarm or security system, remote engine start, heated or cooled seats, heated steering wheel, headlights, automatic headlights, automatic wipers, wireless charging pad.
Squeaks, rattles, wind noises, seals and/or weather stripping, air and water leaks.
"Musty odor started several months ago. First we replaced filters. Not that. Leak from stripping on roof window."
Anonymous, NC (2021 GMC Terrain SL 1.5-L 4 Cyl turbo)Engine rebuild or replacement, cylinder head, head gasket, turbocharger or supercharger, timing chain or belt.
Muffler, pipes, catalytic converter, exhaust manifold, heat shields, leaks.
Transmission rebuild or replacement, torque converter, premature clutch replacement.
Infotainment system (audio, GPS, phone), rear entertainment system, backup or other camera/sensors, head-up display.
Windows, locks and latches, doors or sliding doors, tailgate, trunk or hatch, mirrors, seat controls (power or manual), seat belts, sunroof, convertible top, glass defect.
Radiator, cooling fan, water pump, thermostat, antifreeze leaks, overheating.
Paint (fading, chalking, peeling, or cracking), loose interior or exterior trim or moldings, rust.
Accessory belts and pulleys, engine computer, engine mounts, engine knock or ping, fuel leaks, oil leaks.
Gear selector and linkage, transmission computer, transmission sensor or solenoid, clutch adjustment, rough shifting, slipping transmission, leaks.
Driveshaft or axle, CV joint, differential, transfer case, four-wheel-drive/all-wheel-drive components, driveline vibration, electrical failure, traction control, electronic stability control.
Alternator, starter, hybrid battery replacement, hybrid battery related systems, regular battery, battery cables, engine harness, coil, ignition switch, electronic ignition, spark plugs and wires failure, auto stop/start.
AC compressor, blower (fan) motor, condenser, evaporator, heater system, automatic climate system, electrical failure, refrigerant leakage.
Premature pad/rotor wear, pulsation or vibration, antilock system, parking brake, master cylinder, calipers, squeaking, brake failure, regenerative braking.
Shocks or struts, ball joints, tie rods, wheel bearings, alignment, steering linkage (includes rack and pinion), power steering (pumps and hoses, leaks), wheel balance, springs or torsion bars, bushings, electronic or air suspension.
Sensors (O₂, or oxygen, sensor), emission-control devices (includes EGR), fuel-injection system, fuel gauge/sender, fuel pump, problems filling up the tank.
""Would not start. After a time, up to 20 minutes it would. Problem was resolved.""
Anonymous, NC (2021 GMC Terrain SL 1.5-L 4 Cyl turbo)