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GMC · Known Issues

2025 GMC Terrain Problems: 1 Known Issue

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

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Issue summary

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.

In This Article

  • Terrain Engine1
  • Recalls5
  • FAQ
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In This Article

  • Engine1
  • Recalls5
  • FAQ

All 1 Known Issue

Filter:
ALL YEARS2025202420232022202120202019201820172016201520142013201220112010
Community reported
740 owners

On the 2018-2025 GMC Terrain, 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 intercooler. Symptoms include oily residue around the air intake and intercooler outlet pipe. In severe cases, excessive crankcase pressure also causes coolant intrusion into the combustion chamber. GM issued TSB PIT5697 for this issue. This is the same problem affecting the Chevrolet Equinox 1.5T of the same era.

This issue also affects: Buick Cascada, Buick Encore GX, Buick Encore

Common Symptoms

  • Oil residue in intercooler outlet pipe or air intake
  • Blue/white smoke from exhaust
  • Coolant level dropping with no visible external leak
  • Rough idle after cold start
  • Check engine light (boost, MAF, or misfire codes)
  • Oil smell from engine bay

How to Fix

Replace valve cover assembly with updated GM part (GM 12690058) which includes the revised PCV diaphragm. Clean intercooler and intake manifold of oil contamination. Check for coolant consumption alongside oil intrusion. Inspect air-to-water intercooler for coolant contamination — replacement if contaminated (GM 84446987).

Typical repair cost:$400 - $2,800

Research This Issue

Based on 740 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence740 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026
NHTSA Recalls5 recalls

STRUCTURE:BODY:DOOR

General Motors, LLC (GM) is recalling certain 2024 Chevrolet Blazer, Blazer EV, Equinox, and GMC Terrain vehicles. The door strikers may fracture, resulting in the door opening unexpectedly.

Campaign #23V86900021/12/2023

AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER

General Motors, LLC (GM) is recalling certain 2023 Chevrolet Equinox and GMC Terrain vehicles equipped with ventilated front passenger seats. The Occupant Classification System may not properly disable the front passenger air bag when there is a small child or child restraint detected in the seat.

Campaign #22V92900015/12/2022

CHILD SEAT:VEHICLE LATCH ANCHOR

General Motors, LLC (GM) is recalling certain 2020-2023 Chevrolet Equinox and GMC Terrain vehicles. The four rear-seat lower child seat LATCH anchorage bars may have excessive powder coating, which could prevent a child seat from being installed with the anchorage bars. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 225, "Child Restraint Anchorage Systems."

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Other GMC Models

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Frequently Asked Questions

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.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 740+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #23V339000
11/05/2023

SEATS

General Motors, LLC (GM) is recalling certain 2022-2023 Chevrolet Equinox and 2022 GMC Terrain vehicles. The driver's seat may have a stripped or loose bolt at the seat frame height-adjust pivot.

Campaign #22V72400029/09/2022

TIRES

General Motors, LLC (GM) is recalling certain 2021-2022 Chevrolet Equinox and GMC Terrain vehicles equipped with certain Hankook tires. The tires may have been manufactured with an insufficient amount of curative agent, which could cause tread separation.

Campaign #21V61200005/08/2021

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.