What are the most common GMC Terrain problems?
According to Au7o's analysis of 740+ owner reports, the 2023 GMC Terrain has 6 documented issues. The most frequently reported are: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion, High-Pressure Fuel Pump Failure Causing Engine Stall (Recall), Occupant Classification System Fails to Suppress Front Passenger Airbag in Ventilated Seats (22V929). Of these, 3 are rated critical and should be addressed promptly.
Is the GMC Terrain reliable?
The 2023 GMC Terrain has 6 known issues documented across 740+ owner reports. 3 issues are rated critical: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion and High-Pressure Fuel Pump Failure Causing Engine Stall (Recall) and Occupant Classification System Fails to Suppress Front Passenger Airbag in Ventilated Seats (22V929). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common GMC Terrain problems?
Repair costs for known GMC Terrain issues range from $0 to $2,800, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion, typically costs $400-$2,800 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2018-2025 GMC Terrain 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion?
The 2018+ Terrain with the 1.5L turbocharged engine (LFV/LYX) experiences PCV (Positive Crankcase Ventilation) diaphragm failure inside the valve cover. The integrated PCV diaphragm tears, causing excessive crankcase pressure that forces oil into the intake manifold and intercool… Repairs typically run $400-$2,800. Severity: high.
What is the 2021-2023 GMC Terrain High-Pressure Fuel Pump Failure Causing Engine Stall (Recall)?
On 1.5L turbo Terrains, a component inside the high-pressure fuel pump can fracture prematurely, generating metallic debris that migrates through the fuel line and blocks the injector inlets, starving the engine of fuel and causing sudden stalling and loss of power while driving… Repairs typically run $0-$1,200. Severity: high.
What is the 2023 GMC Terrain Occupant Classification System Fails to Suppress Front Passenger Airbag in Ventilated Seats (22V929)?
GM recalled 2023 Terrain vehicles built with ventilated front passenger seats because the Occupant Classification System may fail to properly disable the front passenger airbag when a small child or a child restraint is detected in that seat. If the airbag deploys against a child… Repairs typically run $0-$0. Severity: high.
What is the 2018-2024 GMC Terrain Charge Air Cooler Moisture Freeze-Up - Misfire, Underboost and Reduced Engine Power in Cold Weather?
On the second-generation Terrain (2018+) with the turbocharged 1.5L LYX or 2.0L LTG engine, the air-to-air charge air cooler (intercooler) accumulates condensate from humid or rainy driving plus PCV-borne moisture. In cold ambient temperatures that water freezes inside the CAC co… Repairs typically run $150-$900. Severity: medium.
What is the 2020-2023 GMC Terrain Rear Seat LATCH Child-Restraint Anchor Bars Over-Coated - Child Seat Cannot Be Properly Attached (23V339)?
GM recalled 2020-2023 Terrain vehicles because excessive powder coating on the four rear-seat lower child seat LATCH anchorage bars can prevent a child restraint from being properly installed or securely latched. A child seat that will not seat fully on the anchor may not restrai… Repairs typically run $0-$0. Severity: medium.
What is the 2010-2024 GMC Terrain Wheel Bearing / Hub Assembly Magnetic Encoder Ring Failure - ABS and Traction Lights Without Bearing Noise?
Terrain front and rear hub assemblies integrate the ABS magnetic encoder ring into the bearing's inboard seal, where it sits directly exposed to road salt and moisture. Two distinct failure modes result. The mechanical one is the familiar humming or roaring that rises with speed… Repairs typically run $300-$800. Severity: medium.
