Restore Peak Performance to Your Vehicle with a VIN-Programmed ECM
Is your Cadillac, Chevy, or GMC plagued by baffling electrical issues, a persistent Check Engine Light, or unpredictable stalling? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as your vehicle’s brain. In my 20+ years of diagnostics, I’ve seen how a faulty ECM can turn a reliable vehicle into a source of constant frustration. This isn’t just a part; it’s the central command for your engine’s performance, fuel economy, and emissions. When it fails, nothing works right.
This replacement Engine Control Module, part number 12628911, is the definitive solution. We take the biggest hassle out of the repair: programming. Simply provide your vehicle’s VIN at checkout, and our technicians will flash the module with the latest, most stable GM factory software specifically for your car or truck. This means it arrives at your door ready for installation, saving you a costly trip to the dealership and their programming fees. This is the most direct path to getting your vehicle running smoothly again.
Case Study: A Tricky Diagnosis
I remember a 2009 Cadillac SRX that came into the shop with a laundry list of complaints from the owner. It had an intermittent no-start condition, occasional rough idling, and the transmission would sometimes shift erratically. The owner had already replaced the battery and alternator with no luck. We scanned it and found a few random communication codes (U-codes) but nothing consistent. After checking the main power and ground circuits to the ECM, we noticed a slight voltage drop under load. Experience told me that even without a hard P0601 (Internal Processor Failure) code, the ECM’s internal voltage regulation was likely failing. We installed a VIN-programmed 2009 SRX Engine Control Module, and it was like a new vehicle. All the intermittent gremlins vanished. This part solved it all.
Is Your GM Vehicle Showing These ECM Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Look out for:
- ✔ Complete no-start or intermittent starting issues.
- ✔ Check Engine Light is on with codes like P0601, P0606, or P060C (Internal Control Module Processor Errors).
- ✔ Network communication codes such as U0100 (Lost Communication with ECM/PCM).
- ✔ Poor or erratic engine performance, including misfires and rough idling.
- ✔ A significant drop in fuel efficiency for no apparent reason.
- ✔ Problems with automatic transmission shifting, such as harsh or delayed shifts.
- ✔ The engine stalls unexpectedly while driving or at a stop.
A Straightforward Guide to Your ECM Installation
For many of the vehicles this module fits, installation is a manageable job for a confident DIYer or any professional mechanic. While specific locations vary, the general process is consistent.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On the 2009 SRX, the ECM is found in the engine compartment on the driver’s side. On other models like the Colorado/Canyon, it’s on the passenger side firewall. Consult a repair manual for your specific vehicle if you’re unsure.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab that needs to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Final Steps: In some cases, a security or anti-theft relearn procedure may be required. This can often be done without special tools by cycling the key. Turn the ignition to ‘ON’ for 10-15 minutes, then ‘OFF’ for 30 seconds, and repeat two more times before attempting to start the engine.
Verified Vehicle Compatibility List
We guarantee this module will function correctly for the following vehicles and options. This part is a direct replacement for multiple service numbers, including 12636659, 12639300, 12628993, 12625453, and more. Please verify your model is on this list to ensure a perfect fit.
CADILLAC DTS 2009-2011
CADILLAC SRX 2009 (4.6L)
CADILLAC STS 2009 (4.4L, 4.6L)
CADILLAC STS 2010 (4.6L)
CADILLAC XLR 2009
CHEVROLET COLORADO 2009-2012 (2.9L, 3.7L)
CHEVROLET CORVETTE 2009 (ZR1)
CHEVROLET TRAILBLAZER 2009 (6.0L)
GMC CANYON 2009-2012 (2.9L, 3.7L)
GMC ENVOY 2009 (5.3L)
HUMMER H3 2009-2010 (3.7L)
BUICK LUCERNE 2009-2011 (4.6L)
SAAB 9-7X 2009
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. You just need to provide your vehicle’s 17-digit VIN when you place your order. It will arrive ready to install.
Is this a brand new part?
This is a high-quality, tested, and verified used OEM part. Each module is inspected and programmed with the latest GM software to ensure it meets or exceeds original factory performance standards.
Will this fix my specific problem?
This module is the direct solution for internal ECM failures, which cause the symptoms listed above. However, proper vehicle diagnosis is key. Please ensure your mechanic has ruled out other issues like bad wiring, sensors, or fuel delivery problems before ordering.
What is a security relearn procedure?
It’s a simple process that syncs the new ECM with your vehicle’s anti-theft system. On most compatible GM vehicles, it involves cycling the ignition key and waiting, as described in the installation guide. It does not require a scan tool.
What if I have a different part number on my old ECM?
This ECM, part number 12628911, is interchangeable with several other GM service numbers like 12636659, 12639300, and 12625453. As long as your vehicle model and engine are on our compatibility list, this module will work for you.