Restore Your Vehicle’s Brain and Drivability
Is your Cadillac, Chevy, or GMC plagued by frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can cause a cascade of problems that are difficult to diagnose. The ECM is the central computer of your engine, and when it falters, the entire vehicle suffers. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. Stop throwing parts at the problem. This is the direct, reliable solution you’ve been looking for.
This listing is for a genuine GM Engine Control Module, part number 12628993, that arrives at your door programmed and ready for installation. We take your vehicle’s VIN and flash the module with the latest, most stable software updates directly from GM. This critical step ensures perfect communication between the module and your vehicle’s other systems, restoring the precise performance and efficiency you expect. By getting a pre-programmed 2009 SRX Engine Module, you bypass the expensive and time-consuming trip to the dealership for programming.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2010 Chevy Colorado that came into my shop on a tow truck. The owner had replaced the fuel pump, spark plugs, and even the mass airflow sensor, but it would still randomly stall and refuse to restart for hours. The codes were all over the place—intermittent communication faults and random misfires. After checking all the wiring, we hooked up a scope to the injector drivers at the ECM. We found the signal would just drop out completely. The internal processor of the original ECM was failing under heat. We installed one of these pre-programmed modules, and the truck fired up instantly and ran perfectly. The customer saved hundreds, if not thousands, in further diagnostic guesswork.
Common Signs of a Failing Engine Control Module
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or U-series communication codes.
- ✔ Vehicle refuses to start or has intermittent starting problems.
- ✔ Noticeable drop in fuel efficiency.
- ✔ Engine stalling, stuttering, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test.
Your Straightforward Installation Guide
Installing your new 2009 SRX Engine Module is a manageable job for a confident DIYer. While specific locations vary by model (see fitment list), the general process is consistent.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: The module is typically found in the engine compartment, often on the firewall, inner fender, or near the air filter box.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them. Inspect connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s usually held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed ECM in place and tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step: In some cases, a security or crank relearn procedure may be needed, which can often be done without special tools. Instructions are widely available online for your specific model, or a local mechanic can perform it quickly.
Verified Fitment for a Wide Range of GM Vehicles
This module is a direct replacement for service number 12628993 and is also interchangeable with 12636659, 12639300, 1263605, 12628911, 12625453, 12622175, 12630464, and 12678512. Please confirm your vehicle is on this list:
- Cadillac CTS (2009): 6.2L
- Cadillac DTS (2009-2011)
- Cadillac SRX (2009): 4.6L
- Cadillac STS (2009-2010): 4.4L, 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 absolutely need to provide my VIN?
Yes. Providing your 17-digit Vehicle Identification Number (VIN) is mandatory. We use it to load the correct GM-certified software for your vehicle’s specific configuration, ensuring a perfect match and proper function.
Is any other programming required after installation?
In most cases, no. Our pre-programming handles the engine and transmission software. However, some GM vehicles may require a simple security relearn or crankshaft position sensor relearn, which can often be completed in your driveway. We recommend searching for the procedure for your specific model.
Will this fix my specific problem or check engine light?
This module will correct any issues directly caused by a failing ECM, including many common check engine light codes. However, it’s crucial to ensure the ECM is the actual root cause. If your issues are caused by a bad sensor or wiring, replacing the ECM will not fix them. Proper diagnosis is key.
Where is the ECM located on my 2009 SRX?
On the 2009 Cadillac SRX with the 4.6L engine, the Engine Control Module is located in the driver’s side of the engine compartment, near the firewall.
Is this part difficult to install for a DIYer?
For someone with basic mechanical skills and tools, this is a very manageable job. It primarily involves disconnecting the battery, unplugging a few connectors, and removing a few bolts. The most important part is being careful with the electrical connectors.