Is Your Cadillac Running Rough, Stalling, or Throwing Confusing Codes?
If you’re dealing with frustrating engine problems like intermittent stalling, poor fuel economy, erratic transmission shifting, or a check engine light that won’t go away, the culprit is often the very brain of your engine: the Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen how a failing ECM can send owners and even other shops on a wild goose chase, replacing perfectly good sensors without ever solving the root problem. Your vehicle’s performance and reliability depend on this critical component functioning flawlessly.
The Direct Solution: A VIN-Programmed ECM
This isn’t just a replacement part; it’s a complete, ready-to-install solution for your vehicle. We take the guesswork and extra cost out of the repair by pre-programming this Engine Control Module specifically to your car using your Vehicle Identification Number (VIN). This ensures all systems communicate correctly right out of the box.
- ✔ VIN-Specific Programming Included: We flash the module with the latest GM-approved software for your exact vehicle.
- ✔ No Dealership Visit Required: Save hundreds of dollars and significant time by avoiding the need for dealership programming.
- ✔ Restores Original Performance: Corrects issues caused by a faulty computer, from poor idle to communication errors.
- ✔ Simple Installation: Designed for a direct swap with your original module.
Expert Pro Tip: Check Your Connectors First!
Before you install your new 2009 XLR Engine Control Module, take a close look at the wiring harness connectors that plug into it. Over the years, I’ve seen countless ECMs fail prematurely due to moisture intrusion or corrosion on the connector pins. A simple water leak from a cowl seal can drip directly onto the harness, causing shorts and communication faults. Cleaning the pins with a dedicated electronics contact cleaner and ensuring the seals are intact can prevent damage to your new module and save you from a repeat failure down the road.
Easy Installation to Get You Back on the Road
Replacing the ECM is a straightforward process that a confident DIYer can handle. While specific steps may vary slightly by model, the general procedure is as follows:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the 2009 Cadillac XLR, the ECM is typically found in the right-hand front of the engine compartment. For other models, it may be on the firewall or near the air cleaner box.
- Disconnect the Harness: Carefully release the locking tabs on the electrical 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.
- Install the New Module: Mount your new, pre-programmed ECM and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start. In most cases, no additional security relearn procedure is necessary.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for a wide range of GM vehicles. Please verify your vehicle is on the list below. This part is interchangeable with the following GM service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
This ECM is compatible with the following models:
- 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)
IMPORTANT: Please provide your vehicle’s 17-digit VIN in the notes section during checkout so we can program the module before shipping. This is a critical step to ensure compatibility and proper function.