Restore Peak Performance to Your Cadillac XLR
If you’re dealing with a frustrating no-start condition, a persistent check engine light, or erratic engine behavior in your Cadillac, the Engine Control Module (ECM) is often the culprit. As the central computer of your vehicle, a failing ECM can cause a cascade of confusing issues. I’ve spent two decades in the garage, and I’ve seen firsthand how a faulty module can mimic other problems, leading owners and even some technicians on a wild goose chase replacing perfectly good sensors. This isn’t just a replacement part; it’s a definitive solution to restore your vehicle’s reliability and performance.
This is a direct-fit, VIN-programmed 2008-2009 XLR Engine Module. We take the guesswork and extra cost out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication with your car’s other systems, from the transmission to the anti-lock brakes, right out of the box.
A Technician’s Notebook: The Ghost in the Machine
A customer brought in a 2009 Cadillac XLR with a complaint of intermittent stalling and a transmission that seemed to have a mind of its own, occasionally refusing to shift. They had already replaced the throttle body and a speed sensor at another shop with no success. The scan tool showed a slew of communication error codes (U-codes) along with a P0601 for internal module failure. This is a classic ECM failure pattern. The internal processor starts to break down, sending corrupt data across the vehicle’s network. We installed one of our pre-programmed modules, performed the security relearn, and the car ran flawlessly. The customer saved hundreds by avoiding a costly misdiagnosis and an expensive trip to the dealer for programming.
Is Your Cadillac XLR Showing These Signs?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- âś” Check Engine Light is illuminated with codes like P0601, P0606, or various U-series communication codes.
- âś” Engine cranks but refuses to start.
- âś” Unexplained drop in fuel economy.
- âś” Rough or unstable idling.
- âś” Engine stalling or hesitating, especially under load.
- âś” Automatic transmission shifting erratically or harshly.
- âś” Loss of communication with your OBD-II scan tool.
A Straightforward Guide to Installation
Installing your new 2008-2009 XLR Engine Module is a manageable job for a confident DIYer. While the programming is done for you, a simple security relearn procedure is required after installation to sync the new module with your vehicle’s anti-theft system.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all systems to discharge.
- Locate the Module: On the 2008-2009 Cadillac XLR, the ECM is located in the engine compartment on the right-hand (passenger) side, near the front.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are typically release tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New ECM: Mount the new module securely onto the bracket and reconnect the electrical harnesses. Ensure they click firmly into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: This critical step pairs the new ECM to your keys. The most common GM procedure is: try to start the engine (it won’t run), leave the key in the ‘ON’ position for 10-12 minutes until the security light goes out, turn the key off for 10 seconds, and repeat two more times. On the third cycle, the vehicle should start.
Verified Vehicle Compatibility List
This ECM, part number 12590032, is a direct replacement for a wide range of General Motors vehicles. It is interchangeable with service numbers 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. While this listing is for the 2008-2009 XLR Engine Module, it also fits many other models. Please verify your original part number or consult the fitment list below. Key compatible models include:
- âś” 2008-2009 Cadillac XLR
- âś” 2006-2008 Cadillac DTS & STS
- âś” 2007-2009 Chevrolet Trailblazer & GMC Envoy
- âś” 2008-2009 Buick Allure & LaCrosse (5.3L)
- âś” 2008 Chevrolet Colorado & GMC Canyon
- âś” 2006-2009 Pontiac G6 (3.6L)
- âś” 2008 Hummer H3
- âś” …and many more. Please check the full fitment data to confirm for your specific vehicle.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the Engine Control Module with the exact software and calibrations for your specific vehicle. This includes engine type, transmission, and factory options, ensuring a seamless, plug-and-play installation without needing a trip to the dealership.
Do I need to do anything after installing it?
Yes. While the main engine programming is complete, you will need to perform a security relearn procedure (also called a VTD or Passlock relearn). This syncs the new module with your vehicle’s anti-theft system and keys. It’s a simple process that typically takes about 30 minutes and requires no special tools.
Is this a brand new part?
This is a top-quality, fully tested OEM replacement part that has been meticulously inspected and programmed to meet or exceed original factory specifications. It provides a reliable and cost-effective solution to a new part from the dealer.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606) or related communication faults, this module is the correct fix. However, you should always diagnose other codes (like sensor or circuit faults) first, as the ECM cannot fix a separate mechanical or electrical issue.
What is the warranty on this module?
This module comes with a comprehensive warranty to give you peace of mind. Please refer to the warranty tab on this page for specific details and duration.