2020 GMC Terrain · symptom sheet
Engine stalls or loses power while driving
- 31owner reports
- 71,000median miles
- 0involved a crash
Newest report Sep 2, 2026 · checked Oct 2, 2026
108 of the 197 complaints on this car are about the engine. 31 of those describe stalling. Only brake wear is reported more often on this car.
Tick what matches of 31 reports
Stalling on other Terrain years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2016, 2017, 2026.
What this problem usually is
Stalling reports are some of the most alarming on the site. The engine quits while the car is moving, sometimes on a highway and sometimes at a stop. Many owners say it restarted right away and the dealer found no stored code, which is part of why these complaints pile up before anything gets fixed.
What got replaced
Owners who name the part that was replaced mention the fuel pump (9 reports) and the battery (7 reports).
Recalls and investigations
One recall on the engine covers the 2020 model year. A recall on the same system isn't always the same failure, so read the defect text.
The start/stop accumulator endcap may have missing bolts.
All 2 recalls on the 2020 GMC Terrain, with the owner complaints on each recalled system
When it happens
The middle half of failures fell between 46,917 and 121,776 miles, from the 12 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 10 service bulletins or notices for the 2020 GMC Terrain that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
This service bulletin advises the tech that the rotational Clicking Noise Heard After Engine Shut Down may be normal characteristics of the vehicle.
This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on.
This technical bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
6 more on the 2020 GMC Terrain page.
What owners wrote
“The vacuum pump locked up and sheered off the end of the cam shaft and made the cam skip timing and destroyed the motor. While driving no check engine likes till after i lost power. Luckly i was able to roll to a stop The pumps have been a problem the car is only 4yrs old and has 71000 miles.”
Filed Jul 31, 2024 · 71,000 miles
Should you keep driving it?
This page can't tell you that. 0 of 31 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Paid for this repair before a recall covered it? How recall reimbursement works
Other problems on this car
- Brakes grind, pulse or wear early 72 reports
- Infotainment, screen or backup camera fails 25 reports