Restore Your Vehicle’s Core Performance and Reliability
Is your Buick, Chevrolet, or Cadillac suffering from frustrating and unpredictable issues? A flashing check engine light, unexplained stalling, rough idling, or a sudden drop in fuel economy are often more than just minor annoyances. These are classic signs that the very brain of your engine—the Engine Control Module (ECM)—is failing. In my 20+ years of diagnostics, I’ve seen how a faulty ECM can mimic a dozen other problems, leading to expensive and unnecessary repairs. This isn’t just a part; it’s the central command center for your vehicle’s performance and efficiency.
We offer a dependable and straightforward solution: a professionally programmed Engine Control Module, compatible with part number 12642665 and many others. The biggest hurdle in replacing an ECM is the expensive programming required at a dealership. We eliminate that step entirely. Simply provide your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM-certified software specific to your car. This ensures that when it arrives, it’s ready for installation, restoring the precise fuel mapping, ignition timing, and transmission communication your vehicle had when it left the factory.
Case Study: A Tricky Diagnosis
A 2012 Chevy Impala came into my bay with a complaint of harsh shifting and intermittent stalling at red lights. The owner had already replaced two transmission solenoids at another shop with no luck. The transmission codes were erratic, and a deep dive with my diagnostic scanner showed communication loss codes (U0100) between the TCM and the ECM. Instead of throwing more parts at the transmission, we inspected the ECM. After swapping in one of our VIN-programmed modules, the communication was instantly restored, the shifting smoothed out, and the stalling vanished. It was a classic case of the ECM being the root cause, saving the customer hundreds in further transmission work.
Is Your Vehicle Showing These Red Flags?
A failing ECM can cause a wide range of symptoms. If you’re experiencing any of the following, this module is the likely solution.
- âś” Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” Vehicle refuses to start or has intermittent starting problems.
- âś” Engine stalls, stumbles, or runs rough for no apparent reason.
- âś” Noticeable decrease in fuel mileage.
- âś” Transmission shifting issues, such as harsh or delayed shifts.
- âś” Communication errors with other vehicle modules (U-series codes).
- âś” Failure to pass an emissions test.
A Straightforward Guide to Installation
Replacing your ECM is a manageable job for a confident DIYer. Our pre-programming service handles the most complex part, leaving you with a direct physical swap.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On most compatible vehicles like the 2010 Allure or Equinox, the ECM is found in the engine compartment, often on the driver’s side near the air filter box or firewall.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten it.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your vehicle may require a brief idle relearn procedure. Simply start the engine and let it idle for 5-10 minutes. The vehicle is now ready to drive.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide array of GM vehicles. It is crucial to match your vehicle, year, and engine size. This part replaces service numbers: 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993.
Cadillac: CTS (2010-2012), SRX (2010-2011)
Chevrolet: Camaro (2012), Captiva Sport (2012), Equinox (2010-2011), Impala (2012), Orlando (2012-2013)
GMC: Terrain (2010-2011)
Saab: 9-5 (2010-2011)
Note: Please verify the specific engine and options listed in the original fitment data, as compatibility can vary. Providing your VIN is the best way to guarantee a perfect match.
Frequently Asked Questions About Your ECM Replacement
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. The main benefit of our service is that we handle all the programming for you. We use your VIN to load the correct, updated GM software before we ship the part. It arrives ready for installation.
Where do I find my VIN and how do I provide it?
Your 17-digit Vehicle Identification Number (VIN) is located on a small plate on the driver’s side of the dashboard (viewable through the windshield) and on the driver’s side door jamb sticker. You can enter it during the checkout process or send it to us in a message after your purchase.
Is this a simple plug-and-play installation?
Yes, for the most part. Because we pre-program the module, you will not need any special computer tools. The physical installation involves disconnecting the battery, unplugging the old module, and plugging in the new one. On some vehicles, an anti-theft relearn procedure may be required, which can typically be done without special tools.
What if I don’t see my exact part number listed?
This module replaces several different part numbers (12616889, 12630908, etc.). As long as your vehicle model and year are on our compatibility list, this module will function correctly once programmed to your VIN.
Will this fix my car’s specific problem?
This module is the definitive solution for a failed ECM. If your vehicle is displaying common symptoms like a no-start condition, erratic engine behavior, or specific internal processor fault codes (like P0601), then this part is designed to resolve those issues.