2003 GMC Sonoma 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.

• Brakes7 owner complaints, usually around 35,000 miles

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

• Body and structure6 owner complaints

  Look underneath for rust, especially on the frame and brake lines, and check that door and panel gaps are even.

• Doors, latches and locks5 owner complaints

  Test every door handle, lock and latch from inside and outside, including the trunk or tailgate.

• Transmission and drivetrain5 owner complaints, usually around 50,700 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.

• EquipmentRecall number 04V132000, Mar 18, 2004

Service bulletins worth asking about

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

• GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilitiesJul 24, 2024
• The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle...Sep 1, 2023
• Structure: body: tailgateMay 9, 2023
• This service bulletin provides information on OEM and Remanufactured Engine and Automatic...Sep 16, 2022
• This diagnostic tip advises the tech not to separate the flexplate from the torque convertor or damage my...Sep 1, 2022
• Power trainSep 1, 2022

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.