Restore Peak Performance and Reliability to Your Vehicle
Is your Cadillac SRX, Chevy Colorado, or another GM vehicle on our fitment list suddenly giving you headaches? Unexplained stalling, a persistent Check Engine Light, rough idling, or a frustrating no-start condition can often be traced back to a single, critical component: the Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can mimic a dozen other problems, leading to wasted time and money on incorrect repairs. This isn’t just a part; it’s the brain of your engine, and when it falters, your vehicle’s performance and reliability suffer.
This replacement Engine Control Module, part number 12639300, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module specifically for your vehicle using your VIN. This means it arrives at your door loaded with the latest GM factory software updates, ready for a straightforward installation. You get a reliable part that restores factory operation without the need for an expensive trip to the dealership for programming. Getting your vehicle back to running smoothly has never been more direct.
Common Signs of a Failing ECM
- âś” Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- âś” The engine cranks but refuses to start.
- âś” Unpredictable stalling or hesitation during acceleration.
- âś” A noticeable decrease in fuel economy.
- âś” Erratic automatic transmission shifting behavior.
- âś” The cooling fans run constantly, even when the engine is cold.
Case Study: A Tricky Diagnosis
I remember a 2010 Chevy Colorado that came into my bay with an intermittent no-start condition. The owner had already replaced the battery and starter. We scanned it and found no active codes, which is the frustrating part of intermittent issues. After checking all the power and ground circuits to the ECM, everything looked perfect. On a hunch, I gently tapped the ECM housing with a screwdriver handle while my apprentice cranked the engine—it fired right up. A hairline fracture on the internal circuit board was causing the connection to fail randomly. Replacing the ECM with a properly programmed unit solved the problem permanently. It’s a classic example of how the 2009 SRX Engine Control Module and its counterparts can fail in ways that don’t always leave a clear code trail.
A Straightforward Guide to Your ECM Installation
- âś” Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
- âś” Locate the Module: On the 2009 SRX, the ECM is found in the driver’s side of the engine compartment. For other models, it may be on the firewall or near the air cleaner box.
- âś” Disconnect Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Never force them.
- âś” Remove the Old ECM: Unbolt the mounting hardware holding the old module in place and remove it from the vehicle.
- âś” Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- âś” Reconnect and Finalize: Plug the harness connectors firmly back into the new module until they click into place. Reconnect your negative battery terminal. A security relearn procedure may be required, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Will This Fit My Vehicle? Verified Compatibility
This module is a direct replacement for service number 12639300 and is also interchangeable with 12636659, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. It is confirmed to fit the following vehicles:
- 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 need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car. It arrives ready to install.
Is this a simple DIY job?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car. It arrives ready to install.
What is a VIN and where do I find it?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car. It arrives ready to install.
Will this fix my specific problem?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car. It arrives ready to install.
What if I order the wrong part?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car. It arrives ready to install.