2014 GMC Terrain Airbag Diagnosis & Fix B0021 B1001 B3902
Diagnosing Airbag trouble codes on a 2014 GMC Terrain B0021 B1001 B3902. I was not told of any accident damage to the vehicle but due to the SDM module having the wrong VIN# in it and doing an internet search on the cars original VIN, I learned the vehicle had been in a pretty substantial crash. It was then learned that the car had the wrong SDM module installed.