This is an OEM ECU ECM PCM Engine Computer Module 12614085. It came out of a crashed 2007 Sierra Crew Cab 5.3L 4x4 with damage to left front side. The truck ran great with no problems until the accident. No problems or defects with the unit. It should work with any 4.8L or 5.3L GM vehicle including the Sierra, Silverado, Tahoe, Yukon, Express, etc. The model number of the unit is 12614085 to be used to verify that it works for your vehicle. Returns are accepted but buyer is responsible for return shipping + 15% restocking fee.