GMC · Known Issues

2023 GMC Terrain Problems: 2 Issues Every Owner Should Know

2023 model year · 740+ owner reports · Updated July 2026

According to Au7o's analysis of 740+ owner reports, the 2023 GMC Terrain has 2 documented known issues, with 2 rated critical. The most serious are 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion ($400-$2,800 repair) and High-Pressure Fuel Pump Failure Causing Engine Stall (Recall) ($0-$1,200 repair). The most commonly reported issue is 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion with 740 owner reports. Across all issues with published estimates, repair costs range from $400 to $2,800. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common GMC Terrain problems?

According to Au7o's analysis of 740+ owner reports, the 2023 GMC Terrain has 2 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). Of these, 2 are rated critical and should be addressed promptly.

Is the GMC Terrain reliable?

The 2023 GMC Terrain has 2 known issues documented across 740+ owner reports. 2 issues are rated critical: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion and High-Pressure Fuel Pump Failure Causing Engine Stall (Recall). 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.

2023 GMC Terrain Problems: 2 Issues Every Owner Should Know

All 2 Known Issues

2018-2025 GMC Terrain: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion#

Common Symptoms

How to Fix

Owner tips & cautions

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2021-2023 GMC Terrain: High-Pressure Fuel Pump Failure Causing Engine Stall (Recall)#