What are the most common GMC Terrain problems?

According to Au7o's analysis of 740+ owner reports, the 2025 GMC Terrain has 1 documented issue. The documented issue is: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion. Of these, 1 is rated critical and should be addressed promptly.

Is the GMC Terrain reliable?

The 2025 GMC Terrain has 1 known issue documented across 740+ owner reports. 1 issue is rated critical: 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion. 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 $400 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.

GMC · Known Issues

2025 GMC Terrain Problems: 1 Known Issue

2025 model year · 740+ owner reports · Updated September 2026

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According to Au7o's analysis of 740+ owner reports, the 2025 GMC Terrain has 1 documented issue, with 1 rated critical. The most serious is 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion ($400-$2,800 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.

2025 GMC Terrain Problems: 1 Known Issue

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

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What are the most common GMC Terrain problems?

Is the GMC Terrain reliable?

How much does it cost to fix common GMC Terrain problems?

What is the 2018-2025 GMC Terrain 1.5L Turbo PCV System Failure and Coolant/Oil Intrusion?