2014 GMC Terrain · symptom sheet
Check engine light or misfire
- 27owner reports
- 112,000median miles
- 0involved a crash
Newest report Feb 18, 2026 · checked Oct 2, 2026
152 of the 283 complaints on this car are about the engine. 27 of those describe misfire.
Tick what matches of 27 reports
Misfire on other Terrain years
No other Terrain model year has enough reports of misfire for a sheet of its own. See every Terrain year.
What this problem usually is
These reports start with the check engine light. Many describe the engine running rough or shaking at idle, a P0300-series code, or a catalytic converter code. A worrying number say the light was flashing. Owners often list ignition coils or spark plugs already replaced, and the light coming back afterward.
What got replaced
Owners who name the part that was replaced mention the sensor (5 reports).
Recalls and investigations
No recall on the engine covers the 2014 model year as of Oct 2, 2026.
When it happens
The middle half of failures fell between 76,000 and 147,623 miles, from the 18 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 40 service bulletins or notices for the 2014 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 inspection/diagnosis/correction information on a cold start misfire and/or rough idle and DTC P0300 that may also be set.
This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce ...
This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to ...
This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
36 more on the 2014 GMC Terrain page.
What owners wrote
“Other years of this vehicle have recalls for the catalytic converter. My check engine came on and it said it could be that or the O2 sensors. O2 sensors have been replaced and the check engine light is back on.”
Filed Feb 28, 2023
Should you keep driving it?
This page can't tell you that. 0 of 27 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 Which lights mean pull over now? Warning lights by color and urgency
Other problems on this car
- Windshield wipers stop working 72 reports
- Engine stalls or loses power while driving 49 reports
- Windshield cracks or distorts 49 reports
- Burns oil or oil level rises 39 reports
- Timing chain or cam phaser rattles 31 reports
- Engine failure, knocking or rod bearing 29 reports