Restore Your Cadillac’s Core Performance and Reliability
If your 2009 Cadillac SRX is experiencing frustrating issues like erratic idling, stalling, a persistent Check Engine Light, or a complete no-start condition, the root cause is often a failing Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen how a faulty ECM can turn a reliable vehicle into a source of constant headaches. The ECM is the central computer of your engine, managing everything from fuel injection and ignition timing to emissions controls and communication with other vehicle systems. When it fails, the entire powertrain suffers.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and high dealership costs out of the equation. By providing us with your vehicle’s VIN at checkout, you will receive a high-quality 2009 SRX Engine Control Module that has been professionally programmed with the latest official GM software updates specific to your exact vehicle. This critical step ensures seamless integration, optimal performance, and restored fuel efficiency right out of the box.
From the Diagnostic Bay: The Intermittent Stall Mystery
A customer brought in a 2009 Cadillac SRX with a 4.6L engine that had a problem that was driving them crazy: it would stall intermittently at stoplights, but not always. No specific trouble codes were stored, just a few random communication errors. Other shops had replaced sensors and cleaned the throttle body to no avail. After hooking up my scan tool and monitoring live data, I noticed the ECM’s internal processor would occasionally drop communication for a split second right before a stall. This pointed to an internal hardware failure within the module itself. We installed a VIN-programmed ECM just like this one, and the problem was solved instantly. The customer was thrilled to have their reliable luxury SUV back without the expensive guesswork.
Is Your Vehicle Showing These Signs of ECM Failure?
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but will not start.
- ✔ Unexplained drops in fuel economy.
- ✔ The engine stalls, stumbles, or misfires for no apparent reason.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Loss of communication with the scan tool or other modules (U-codes).
- ✔ Failed emissions inspection.
A Straightforward Guide to Installation
Installing your new 2009 SRX Engine Control Module is a manageable task for a DIYer with basic tools, especially since the programming is already done. For the 2009 SRX, the ECM is typically located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: Open the hood and find the module in the LH (driver’s side) engine compartment. It’s a metal box with several large electrical connectors.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and unplug them from the old ECM. Do not force them; they have release mechanisms.
- Remove the Old Module: Unbolt the mounting hardware that secures the ECM to its bracket or the vehicle body.
- Install the New Module: Mount your new, pre-programmed ECM in the same location 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.
- Final Step: Some vehicles require a security relearn procedure, which can often be done by cycling the key. Consult your owner’s manual or a reliable online resource for your specific vehicle’s procedure if it doesn’t start immediately.
Verified Vehicle Compatibility
This module, part number 12622175, is a direct replacement for a wide range of GM vehicles. It is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12630464, and 12678512. Please confirm your vehicle is on the list below:
- 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
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the Engine Control Module with the exact software and calibrations your specific vehicle requires from GM. This ensures perfect compatibility and function without a trip to the dealer.
Is this a plug-and-play part?
Yes, because we program it to your VIN before shipping, it is a plug-and-play installation for most vehicles. In some cases, a simple security or anti-theft relearn procedure may be necessary, which typically does not require special tools.
Will this fix my car’s specific problem?
This module will correct issues directly caused by a faulty ECM. While the symptoms listed are very common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the part you need before ordering.
What if my original part number is not 12622175?
This ECM is a direct replacement for several service numbers, including 12636659, 12639300, and others listed in the description. As long as your vehicle is on our compatibility list, this module will work correctly once programmed.
Do I need to send my old ECM back?
No core charge or return is required for this part. You can keep or recycle your old module.