The Brain of Your Vehicle, Restored and Ready to Install
When the Engine Control Module (ECM) in your 2009 Cadillac SRX or other compatible GM vehicle starts to fail, it can feel like the vehicle has lost its mind. You might be dealing with a persistent check engine light, frustrating no-start conditions, erratic engine performance, or even incorrect transmission shifting. As a technician with over two decades of experience under the hood, I’ve seen how a faulty ECM can cause a cascade of confusing symptoms that are often misdiagnosed, costing drivers time and money. This isn’t just a component; it’s the central command center for your engine’s performance, fuel economy, and emissions.
This replacement Engine Control Module, part number 12630464, is the definitive solution to these problems. What sets this module apart is our professional, off-board programming service. Before we ship it, we flash the unit with the very latest GM-certified software updates, tailored specifically to your vehicle using the VIN you provide. This critical step eliminates the need for an expensive trip to the dealership for programming, making this a truly plug-and-play solution for both seasoned mechanics and determined DIYers. By installing a precisely matched and updated module, you’re not just replacing a part—you’re restoring your vehicle’s original performance and reliability.
A Technician’s Notebook: The Intermittent Stall
I remember a 2009 SRX 4.6L that came into my bay with a ghost of a problem. The owner complained of intermittent stalling, but only after driving for 30+ minutes on a warm day. No codes were stored. We checked fuel pressure, sensors, and wiring—everything seemed fine. On a hunch, I let the engine run in the shop until it was fully heat-soaked. Then, using a heat gun, I carefully warmed the ECM. Within minutes, the engine sputtered and died. After it cooled, it started right back up. The internal processors were failing under thermal stress, a classic ECM failure I’ve seen dozens of times. We replaced it with a pre-programmed module like this one, and the problem was solved for good. It’s a reminder that not all critical failures throw a code.
Telltale Signs of a Failing GM ECM
If you’re experiencing any of the following issues, a failing ECM could be the culprit. A proper diagnosis is key, but these are common indicators I’ve seen in my shop:
- ✔ Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable loss of power, poor acceleration, or hesitation.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling, especially when the engine is warm.
- ✔ Failure to pass state emissions testing.
Simple Swap: Your ECM Installation Guide
Installing your new 2009 SRX Engine Module is a straightforward process. While specific locations vary by model (see fitment list), the general steps are 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 in the LH (driver’s side) engine compartment. For other models, it may be on the firewall or frame rail.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- 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 in place and secure it with the original hardware.
- Reconnect and Secure: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In many GM vehicles, you will 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 service information for the exact procedure.
Verified Vehicle Compatibility List
This module is a direct replacement for a wide range of GM vehicles. Please verify your model and engine combination below. This unit is interchangeable with service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
CTS 2009 (6.2L)
DTS 2009-2011
SRX 2009 (4.6L)
STS 2009 (4.4L, 4.6L)
STS 2010 (4.6L)
XLR 2009 (ID 12636659 or 12625453)
Chevrolet:
COLORADO 2009-2012 (2.9L, 3.7L)
CORVETTE 2009 (ZR1)
TRAILBLAZER 2009 (6.0L)
GMC:
CANYON 2009-2012 (2.9L, 3.7L)
ENVOY 2009 (5.3L)
Buick:
LUCERNE 2009-2011 (4.6L)
Hummer:
HUMMER H3 2009-2010 (3.7L)
Saab:
SAAB 9-7X 2009
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to program the ECM with the exact software and calibrations your vehicle requires from the factory. This ensures perfect compatibility with your engine, transmission, and options package, making installation seamless.
Is any additional programming required after I install it?
No, the main engine programming is complete. However, you will likely need to perform a simple security or anti-theft relearn procedure, which can be done without special tools. This syncs the new ECM to your vehicle’s keys and security system.
Will this fix my specific problem?
This module will correct issues directly caused by a failing ECM. While symptoms like a no-start or check engine light are common, it’s crucial to ensure the ECM is the actual point of failure. We recommend proper diagnostics to rule out other components like sensors or wiring.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified to be fully functional before being programmed with the latest GM software for your specific vehicle, providing OEM performance and reliability.
How do I find my original part number?
The part number is printed on a sticker on the case of your current ECM. You can cross-reference it with the numbers listed here (12630464, 12636659, etc.) to confirm compatibility.