2018 GMC Terrain used buying checklist

Test for the problems owners report most

The most reported problems of this model year, with what to look for on the test drive.

• Check engine light33 owner complaints, usually around 90,000 miles

  Start the engine cold and listen for knocking or ticking. Check for warning lights, oil leaks and a low oil level, and ask how often oil had to be topped up.

• Brake failure14 owner complaints

  Brake firmly from moderate speed: the pedal should feel firm and the car should stop straight, with no grinding or pulsing.

• Jerking or lurching13 owner complaints, usually around 2,500 miles

  On a test drive from a cold start, check that shifts are smooth, with no slipping, delays, shudder or jerking at low speed. Ask for transmission fluid service records.

Make sure these recalls were done

Recall repairs are free at any dealer of the brand. Ask the seller for proof, or have a dealer check the VIN.

• Power trainRecall number 20V668000, Oct 29, 2020
• Service brakes, hydraulicRecall number 18V576000, Aug 30, 2018
• Fuel system, gasolineRecall number 18V358000, May 31, 2018
• Air bagsRecall number 18V340000, May 24, 2018
• Power trainRecall number 17V516000, Aug 22, 2017

Repairs the maker may still cover

Warranty extensions can cover a known problem beyond the normal warranty. Check whether this car is still within the time or mileage limit.

• This service bulletin provides information about GM AccessoriesMay 3, 2024

Service bulletins worth asking about

Repair instructions the maker sent to dealers for known problems. Ask whether any of these repairs were done.

• This service bulletin provides information on replacing the intake manifold when the engine is replaced...Jun 5, 2025
• The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle...May 15, 2025
• This service bulletin provides information to dealership personnel for new vehicles with less than 1,000...May 7, 2025
• This warranty administration bulletin provides policy information on vehicles outside of a California...Apr 18, 2025
• This service bulletin provides information on the proper Reflective High Temperature Heat and/or...Apr 3, 2025
• The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential...Mar 31, 2025

Before you pay

• Decode the VIN and make sure it matches the title, the registration and the car itself.
• Get a vehicle history report to check for accidents, salvage or flood titles and odometer problems.
• Ask for service records, especially oil changes and any transmission fluid service.
• Start the car from cold, and drive it at city and highway speeds for at least 20 minutes.
• Have an independent mechanic inspect the car before you sign anything.