03 CHEVY SILVERADO 5.3L 4X4 ECU ECM PCM ENGINE MODULE COMPUTER 12570558 HAS COM
12579403 - You must match these exactly!
Hardware No: 12570558
Service No: 12576106
ECU tested and does have communication and a properly functioning processor! All 8 injectors tested good, IA heater relay tested, FICM relay control, EGR function, Fuel pressure regulator and more!!
- You must match your part number exactly as seen above. 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 2003 GM Chevy Silverado 5.3L gas models with an exact part number match.
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.