Restore Peak Performance and Reliability to Your GM Vehicle
Is your 2012 Impala or other GM vehicle suffering from frustrating, intermittent issues? A faulty Engine Control Module (ECM) is often the hidden culprit behind problems like a persistent Check Engine Light, poor fuel economy, erratic engine behavior, or even a no-start condition. As the ‘brain’ of your vehicle’s engine, a failing ECM can disrupt everything from fuel injection and ignition timing to transmission shifting. This isn’t just an annoyance; it’s a critical component failure that compromises your vehicle’s performance and safety.
This replacement ECM, part number 12651993, is the definitive solution. We take the guesswork and high cost out of the repair by professionally programming the module to your specific vehicle using your VIN. This ensures it arrives with the latest GM factory software updates, ready for a straightforward installation. You get a reliable fix that restores factory performance without the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I remember a 2012 Cadillac CTS that came into the shop with a laundry list of complaints: harsh shifting, a flashing check engine light, and occasional stalling at red lights. The owner had already replaced a couple of sensors with no luck. A scan revealed a U0100 (Lost Communication with ECM/PCM) and a P0606 (ECM/PCM Processor Fault). While communication codes can be tricky, the P0606 was the smoking gun. It points directly to an internal failure of the module itself. We installed a VIN-programmed ECM just like this one, and it solved all the issues in one go. The customer was relieved to have his car back and running smoothly, saving him from chasing phantom problems.
Is Your GM Vehicle Showing These Signs of ECM Failure?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty ECM could be the cause. Look out for these common indicators and diagnostic trouble codes (DTCs):
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel efficiency for no apparent reason.
- ✔ Engine stalling, stumbling, or misfiring while driving.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication issues with your diagnostic scan tool.
Your Straightforward ECM Installation Guide
Installing your new, pre-programmed 2012 Impala Engine Control Module is a manageable job for a confident DIYer. Follow these general steps for a successful replacement. Note: The exact location may vary slightly by model (e.g., on the air cleaner bracket for the Impala, or in the LH/RH engine compartment for others).
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: On the 2012 Impala, the ECM is typically mounted to the air cleaner bracket. On other compatible models, it’s usually in the left-hand (driver’s side) engine compartment.
- Disconnect Wiring Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware as you will reuse it for the new module.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket using the original hardware. Ensure it is secure.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security or anti-theft relearn procedure may be necessary. This can often be done without special tools and instructions can be readily found for your specific model. Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This ECM is a direct replacement for multiple part numbers, ensuring broad compatibility across a range of GM vehicles. Please verify your vehicle and original part number from the list below. This unit replaces part numbers: 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993.
- ALLURE (2010) – 2.4L & 3.0L
- CAMARO (2012) – 3.6L
- CAPTIVA SPORT (2012)
- CTS (2010-2012) – 3.0L & 3.6L
- EQUINOX (2010-2011)
- IMPALA (2012)
- LACROSSE (2010-2011) – 2.4L & 3.0L
- ORLANDO (2012-2013)
- REGAL (2011)
- SAAB 9-5 (2010-2011) – 2.0L
- SRX (2010-2011) – 3.0L
- TERRAIN (2010-2011)
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the correct, vehicle-specific software from GM. This programming ensures the ECM communicates properly with your engine, transmission, and other onboard systems, making the installation process much smoother.
Is any additional programming needed after installation?
No! This module arrives pre-programmed and ready to install. In some vehicles, a simple ‘Security Relearn’ or ‘Crankshaft Position Variation Relearn’ procedure may be required, which can typically be done without special scan tools. This is not the same as full module programming.
How do I find my original part number?
Your ECM’s part number is printed on a sticker directly on the module’s case. You will need to locate the ECM on your vehicle to read it. This unit is a direct replacement for several part numbers, so even if yours is different, it will work if listed in our compatibility chart.
Will this fix my ‘Check Engine’ light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606), then yes, this part is the correct fix. However, a check engine light can be caused by hundreds of other issues. Proper diagnosis is always recommended.
Is this a brand new part?
This is a high-quality, tested, and verified used OEM part. Each unit is inspected and then programmed with the latest software for your vehicle, offering a reliable and cost-effective alternative to a new dealer part.