• 12703878 12703872
• Service NO: 12703872 Software NO: 12703878 - You must match both of these!

• You must match your part numbers exactly as seen above all the way through. If any numbers are off compared to your original it will not work properly.
• ECU will require programming or coding to your vehicle or vehicle's security system and is not plug and play.
• ECU will fit various GM 5.3 6.2 models with exact part numbers match.

ECU has been tested with our state of the art vehicle simulator which tests over 15 circuits of the ECU! Some of those are listed below:
• Reference Voltage Good!
• ECU powered up and has communication!
• ECU fuel pump/main relay test good!
• ECU injectors/coils test good and much more!

We do not provide programming for this ecu. You'll need your mechanic to perform the programming after installaion. **NOTE: As long as you did match your part and service numbers, the vehicle will start after programming however if the vehicle is running poorly you will need to have a crank and throttle relearn completed. An OE level scan tool will be required for these two processes.

• Mounting points are all intact
• Pins perfect, none are broken or bent

This ECM comes with a 90 day warranty from the date of purchase. Please keep a copy of your purchase record which we will send with your item.