Restore Peak Performance and Reliability to Your GM Vehicle
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition, a failing Engine Control Module (ECM) is often the culprit. As the ‘brain’ of your vehicle’s engine management system, its proper function is critical. This isn’t just an inconvenience; it affects fuel economy, emissions, and overall vehicle safety. I’ve seen firsthand in my shop how a faulty ECM can mimic a dozen other problems, leading to wasted time and money on unnecessary repairs.
This genuine GM Engine Control Module, part number 12630464, is the definitive solution. We take the guesswork and hassle out of the replacement process. Before we ship it, we will program the module with the latest GM-certified software specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This means it arrives at your door ready for a straightforward installation, saving you a costly trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2009 Chevy Trailblazer with the 6.0L V8. The complaint was intermittent stalling at stoplights and a check engine light with a P0606 code (ECM/PCM Processor Fault). They had already replaced the spark plugs and an O2 sensor with no luck. After verifying power and grounds to the ECM were solid, we knew the internal processor was failing. Instead of a complicated dealer visit, we sourced a pre-programmed module like this one. The swap took less than 30 minutes in the bay, and after a quick security relearn, the truck ran perfectly. The customer was thrilled to have a reliable vehicle again without the dealership price tag.
Is Your Vehicle Showing These Symptoms?
A failing ECM can cause a wide range of problems. If you’re experiencing any of the following, this module is likely the fix you need:
- ✔ Check Engine Light (CEL) is on with codes like P0601, P0606, or other communication errors (U-codes).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel mileage.
- ✔ Stalling, stumbling, or hesitation during acceleration.
- ✔ Rough or erratic idling.
- ✔ Transmission shifting issues or failure to communicate with the TCM.
- ✔ Apparent loss of spark or fuel injector pulse.
A Straightforward Guide to Your 2009 Trailblazer Engine Control Module Installation
Replacing the ECM is a job most DIYers can handle with basic tools. Our pre-programming service makes it even simpler. Follow these general steps to get back on the road.
- Safety First: Always 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 2009 Trailblazer, the ECM is typically located on the driver’s side of the engine bay, near the firewall or inner fender.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors 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. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure the bolts.
- Reconnect Everything: Plug the electrical harnesses back into the new module until they click securely in place. Reconnect your negative battery terminal.
- Perform Security Relearn (If Needed): In many cases, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s specific procedure if required.
Verified Vehicle Compatibility
This ECM is a direct replacement for a wide range of General Motors vehicles. It is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. Please verify your vehicle is on the list below:
CADILLAC DTS 2009-2011
CADILLAC SRX 2009 (4.6L)
CADILLAC STS 2009 (4.4L, 4.6L), 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
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, with no additional programming required.
Why do you need my VIN?
Your VIN allows us to load the exact, correct software and calibrations for your vehicle’s specific engine, transmission, and options, ensuring perfect compatibility and performance.
Is this part difficult to install?
For most individuals with basic mechanical skills, this is a straightforward replacement. It involves disconnecting the battery, unplugging the old module, unbolting it, and installing the new one. A simple security relearn procedure may be necessary afterward.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original ECM (e.g., DTC P0601, P0606), then yes, this part will resolve the issue. It’s crucial to ensure the root cause of the problem is the module itself and not a wiring or sensor issue.
Is this a new or used part?
This is a high-quality, inspected, and tested original equipment (OE) module that has been professionally programmed with the latest software for your vehicle.
What if I order the wrong part?
Providing your VIN at checkout helps us guarantee fitment. We will verify compatibility before programming and shipping to prevent any errors, ensuring you get the correct part the first time.