Table 1 shows one common engine and engine cooling related problems of the 2023 GMC Terrain.
| Problem Category | Number of Problems |
|---|---|
| Engine And Engine Cooling problems |
Took dealer 3/26 for sam issue engine power reduced after already cause me hit curb. Got it out 4/1/26 now 4/5/26 it happened again same codes after they claimed they fixed it. Also keep having emergency services come on a caused my dashboard out. My issues is car keeps stalling losing power. Same codes as week ago after dealer fix. Also 4 time took for noises in my car from passenger side. They keep telling me they can’t replicate it, but you can clearly see where the door is not lined up. This has been going on for over 30,000 miles for that. Like some of these issues have been going on since the 36,000 but now I’m having issues where I’m losing power like this is insane all before 60,000 miles which I’m about to hit. It’s gonna end up getting me killed on the interstate. My VIN also says it’s fwd it’s awd at4 . Called dealer said only to update software clearly not the issue. My doors are off and they have refused to fix those for over 30,000 miles now. It won’t let me attach any pics for some reason I’ve tried since yesterday.
The contact owns a 2023 GMC Terrain. The contact stated that while driving on several occasions at various speeds, the check engine warning light illuminated, the message "engine power reduced" was displayed, and the vehicle lost power. The vehicle stalled on three separate occasions. The vehicle was able to restart each time after approximately 15 minutes of waiting, but the vehicle failed to accelerate above 40 mph. The vehicle was taken to a dealer and dtc: p228c, p0089, and p006c were retrieved, and the contact was informed that the fuel pump and fuel injectors needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was unknown.
The high pressure fuel pump, the car randomly goes into limp mode and stalls and then when cranking it back up in the middle of 635 it hesitates to start, done this 3 times already.
GMC Terrain with 12,564 total miles had experienced an engine failure. Under normal driving conditions, the car was sluggish and would not accelerate properly when pulling out into traffic or when getting on the freeway/interstate causing fear for driver safety and causing traffic slowdowns or congestion with a significantly increased risk of crash. While driving to work, the vehicle service engine light turned on and displayed "reduced engine power". Upon investigation the dealership found codes p0011, p0014, p0016, p0017, and quoted "cylinder 4 intake rocker had fallen off and laying on head, found excessive debris and metal material around rocker 4, found cylinder 2 intake rocker to be worn sideways. Found heavy damage to intake camshaft. Removed oil filter - found excessive metal in oil filter". Secondary issue, infotainment screen would randomly flash bright white on the right half, causing a major driver distraction. Engine, turbo, and infotainment system were all replaced, and vehicle returned 11. 06. 2025.
1st failure. August 28, 2025. Vehicle stalled out while driving with no warning. Check engine light stayed on. Could not drive. Car towed to dealership. Scanned codes found: p0089, p00c6 and p228c. Cause: internal failure. Bulletin pertaining to this issue performed. Program of ecm per bulletin. 2nd failure. February 19, 2026 vehicle stalled out a 2nd time while driving with no warning. Check engine light stayed on. Could not drive. Towed in a 2nd time. Scanned codes found: p0089, p00c6, p228c and p2c1f. Cause: internal fault. Fuel pump power control module replacement. Fuel pump replacement. 3rd failure. March 4th, 2026. Vehicle stalled out a 3rd time while driving with no warning. Check engine light stayed on. Could not drive. Towed in again to dealership. Currently sitting at dealership waiting on repairs a 3rd time for the same thing. Wife is 76 years old and is terrified to drive this car. What if this stalls out on the freeway in traffic. Car is unsafe to drive.
The contact owns a 2023 GMC Terrain. The contact stated while driving 15 mph, the message "engine power reduced” was displayed on the instrument panel. The contact stated that the vehicle the lost motive power in the middle of the roadway. The check engine warning light was illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the high-pressure fuel pump, causing fuel to leak into the oil, resulting in damages to the catalytic converter and oxygen sensor. The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA hotline for assistance. The failure mileage was 41,000.
At stop light turning right, the car stalled, cut on and cut back off, cut on and back off with about 30 cars behind me. Sputtering. On the dash board it said “engine power reduced”. I had to be pushed out a main highway by police, and thankfully my 6 month old daughter wasn’t in the back seat. I have had this car 12 days with 48256 miles on it. I’m extremely concerned with the safety of this car. And when towed was leaking gas like fluid.
Gm flier pip6071a - continued engine misfire/chugging/buck/skip under load, going up hills, trying to pass, etc. Was taken to shop January 2025 ~90,000 with these symptoms. Charged for spark plug replacement (visit 1). Taken back January 2026 ~150,000 miles, charged for ignition coil 1 and spark plugs. Immediately returned as problem persisted, spark plugs replaced (visit 3). February 6 2026, same problem as before, spark plugs replaced (visit 4). February 18 2026, currently in shop, problem persisting, trying to say it is the other 3 ignition coils, even after I requested they check O2 sensor and inspect catalytic converter.
Rear main seal leak car has been with dealer since 12/30/24 until present day. No updates other than I may need a engine.
I bought a 2023 GMC terrian sle brand new 14 months ago. It has 30,000 miles on it. I was driving down i75 and the car turned off. No warning signs! not to mention the car had no power! I couldn’t even put on my emergency flashers! me and my 3 year old son luckily were able to make it through a lane of traffic and up the embankment to call for help! I had the car towed to the dealership and they can’t find anything wrong with it! the car is acting normal now but I don’t feel safe in it!.