There are 3 owner-reported steering complaints for the 2020 GMC Terrainin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
I was driving 55 miles an hour on an Expressway. And suddenly my truck just shut off.The brake became very hard unable to break very scary situation for me and my children. Engine power was reduced and would not start, many errors came up. The vacuum pump failed, which also caused the cam shafts to fail.The vacuum pump exploded into pieces and sent metal into my engine.
Service brake assists light flashes on dashboard . Steering wheel locks up and jerk’s loose suddenly when making a right turn, in these moments when the steering wheel jerks loose ;hands are off taken off the steering wheel otherwise injury can occur. Battery life 2 -yrs old is not performing optimally. Can not hold a sufficient charge and ESC light flashes. Vdnt valve leaks discovered.
THIS VEHICLE IS UNSAFE DUE TO A VIOLENT SIDE TO SIDE WOBBLE IN THE FRONT END MUCH LIKE THE JEEP DEATH WOBBLE. THIS HAPPENS CONSTANTLY ANYWHERE FROM 30MPH - 70MPH USUALLY AFTER HITTING A SMALL BUMP OR WHEN TURNING HARD. THE TURNING ASPECT IS WHERE IT HAS BECOME VERY DANGEROUS ON SLIPPERY SURFACES AS THE CAR THEN SLIDES OUT. I LIVE IN THE MOUNTAINS WHERE THIS IS A NORMAL OCCURANCE. I AM ACTUALLY AFRAID TO DRIVE THIS VEHICLE ANY LONGER. THE DEALERS HAVE CONFIRMED THE ISSUE, BUT STATES THAT GM DOES NOT HAVE A FIX FOR THIS AS OF NOW. I HAVE HEARD THIS IS AFFECTING ONLY THE AWD TERRAINS AND EQUINOX PLATFORMS. GM HAS BEEN UNRESPONSIVE TRYING TO GET AN ANSWER OR GETTING THIS FIXED. THE CAR HAS BEEN INTO MULTIPLE DEALERSHIPS SEVERAL TIMES FOR THIS SAME ISSUE AND HAS BEEN HAPPENING SINCE THE CAR TURNED ABOUT 2400 MILES AND HAS BEEN HAPPENING MORE FREQUENTLY SINCE THEN FOR THE PAST 6000 MILES.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026