Is Your Vehicle Running Rough, Stalling, or Not Starting at All?
A failing Engine Control Module (ECM) can be the source of some of the most frustrating and difficult-to-diagnose vehicle problems. If you’re dealing with a persistent Check Engine Light, unpredictable stalling, poor fuel economy, or a car that simply won’t communicate, the very brain of your engine might be the culprit. Don’t let a faulty computer keep you stranded. This genuine GM Engine Control Module is the reliable, straightforward solution to restore your vehicle’s performance and get you back on the road with confidence.
Common Symptoms & Your Solution
A problematic ECM can manifest in various ways. You might be experiencing:
- Check Engine Light (CEL) with communication-related trouble codes (U-codes).
- Engine stalling or cutting out for no apparent reason.
- Complete no-start condition where the engine cranks but won’t fire.
- Noticeable decrease in fuel efficiency.
- Erratic transmission shifting or other strange electrical behavior.
This fully tested, programmed 12655007 ECM is the definitive solution. We take a genuine, used OEM unit and flash it with the latest official GM software calibrated specifically to your vehicle’s VIN. This process ensures perfect compatibility and function, just like the original, without the exorbitant dealership price tag.
Features & Tangible Benefits
- ✔ Plug & Play Installation: This unit arrives pre-programmed to your vehicle’s unique VIN. No expensive dealer-level programming tools are required for installation, saving you time and hundreds of dollars in labor.
- ✔ Genuine OEM Reliability: Sourced from salvaged vehicles, this is an original equipment manufacturer part, ensuring perfect fitment, connector compatibility, and long-term durability that aftermarket units can’t match.
- ✔ Updated GM Software: We flash the module with the most current software available from General Motors for your specific vehicle, which can resolve factory bugs and improve overall performance and efficiency.
- ✔ Cost-Effective Repair: Get a high-quality, perfectly functioning engine computer for a fraction of the cost of a new unit from a dealership.
- ✔ Broad Compatibility: This versatile ECM, also known by part numbers 12653998, 12633555, and 12644446, fits a wide range of popular GM models.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
Many people assume you can just swap an ECM from another vehicle. On modern GM cars, this is impossible. The ECM is tied to the original vehicle’s anti-theft system (VATS/Passlock) and has specific calibrations for its engine, transmission, and options. Our VIN programming service is not just a convenience—it’s essential. We overwrite the old data and configure this programmed 12655007 ECM to think it was born for your exact car, ensuring it communicates flawlessly with all other modules for a seamless and successful repair.
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship the ECM without it. You can typically find your VIN on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will I need to do any additional programming after installation?
In most cases, no. The core engine and systems programming is complete. However, some GM vehicles may require a simple, key-on/key-off security relearn procedure that you can do yourself in your driveway. We can provide instructions for this common procedure if needed.
Is this a new part?
No, this is a used, genuine OEM part that was carefully removed from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped to you.
My original part number is slightly different. Will this work?
This listing is for part number 12655007 and its direct interchanges: 12653998, 12633555, and 12644446. As long as your vehicle is on the compatibility list provided, this ECM will function correctly once programmed to your VIN.
What does the warranty cover?
This part is covered by a one-year replacement warranty. In the unlikely event the unit fails within one year of the purchase date, we will provide a replacement unit. This covers the part itself, not labor or other diagnostic costs.