Restore Peak Performance to Your GM Vehicle
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. Random stalling, a check engine light that won’t go away, and poor fuel economy are more than just annoyances—they’re signs that your vehicle’s brain is in trouble. This replacement 2009 XLR Engine Module is the definitive solution, designed to restore the precise control and reliability you expect from your car.
The biggest hurdle in replacing an ECM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. When you order, simply provide us with your Vehicle Identification Number (VIN), and my team will program the module with the latest GM factory software specific to your vehicle. It arrives at your door ready for a straightforward, plug-and-play installation, saving you time and hundreds of dollars in programming fees.
Case Study: A Tricky Diagnosis
I remember a 2009 Cadillac STS that came into the shop with a laundry list of intermittent complaints: occasional hard starts, flickering dash lights, and a transmission that would sometimes shift harshly. The owner had already replaced the battery and alternator. Scans showed a slew of communication error codes (U-codes) that would come and go. After hours of chasing wires, we traced the issue to an internal fault in the ECM. The module was intermittently failing, corrupting data on the CAN bus network and causing chaos with other modules. A pre-programmed ECM like this one resolved all issues instantly, highlighting how a single failing component can mimic multiple system failures.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) with codes that are difficult to diagnose.
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or other processor faults.
- ✔ Unexplained loss of power, hesitation, or poor acceleration.
- ✔ Intermittent stalling or a complete no-start condition.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Communication errors with scan tools or other vehicle modules.
- ✔ Erratic automatic transmission shifting behavior.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the ECM: On the 2009 XLR, the ECM is found in the right-hand front of the engine compartment. For other models, its location may vary (e.g., firewall, inside the air cleaner box).
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old module. Avoid forcing them.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware, as you will need it for the new unit.
- ✔ Install the New Module: Mount your new, pre-programmed 2009 XLR Engine Module using the original hardware.
- ✔ Reconnect Everything: Securely plug the wiring harnesses into the new ECM. You should hear or feel a click. Reconnect the negative battery terminal.
- ✔ Final Check: Turn the key to the ‘On’ position for 10-15 seconds before starting the engine. This allows the vehicle’s systems to recognize the new module. Start the engine and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. Please confirm your model and options below:
- Cadillac CTS (2009): 6.2L, (RH front engine compartment)
- Cadillac DTS (2009-2011)
- Cadillac SRX (2009): 4.6L, (LH engine compartment)
- Cadillac STS (2009-2010): 4.4L or 4.6L, (LH frame rail)
- Cadillac XLR (2009): (RH front engine compartment), ID 12636659 or 12625453
- Chevrolet Colorado (2009-2012): 2.9L or 3.7L, (RH firewall)
- Chevrolet Corvette (2009): ZR1, (RH engine compartment)
- Chevrolet Trailblazer (2009): 6.0L, (LH engine)
- GMC Canyon (2009-2012): 2.9L or 3.7L, (RH firewall)
- GMC Envoy (2009): 5.3L, (LH engine)
- Hummer H3 (2009-2010): (RH firewall)
- Buick Lucerne (2009-2011): 4.6L, (lower part of air cleaner box)
- Saab 9-7X (2009): (LH engine)
By purchasing this VIN-programmed 2009 XLR Engine Module, you are choosing a reliable, cost-effective repair that gets your vehicle back to factory specifications without the hassle.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. This module arrives fully programmed to your vehicle’s VIN with the latest GM software updates. It is a plug-and-play solution, ready for installation right out of the box.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information to program the module correctly.
Is this part the same as a Powertrain Control Module (PCM)?
Yes, the terms Engine Control Module (ECM) and Powertrain Control Module (PCM) are often used interchangeably for this component. It is the main computer that controls engine and, in some cases, transmission functions.
Will this fix my specific check engine light codes?
This module is a direct solution for internal processor faults like DTC P0601 or P0606. While it can resolve many other issues, it’s essential to properly diagnose your vehicle to ensure the ECM is the root cause of the problem.
What if my original part number is not 1263605?
Please check the list of interchangeable service numbers provided in the description. This module is a direct replacement for several part numbers, including 12636659, 12639300, 12628993, and others listed.