Is Your Cadillac XLR Experiencing Mysterious Electrical Problems?
As a technician with over two decades of experience, I know the frustration that comes with a high-performance vehicle like a 2009 Cadillac XLR that just won’t run right. You might be dealing with a check engine light that won’t go away, intermittent stalling at stoplights, a harsh-shifting transmission, or even a complete no-start condition. These aren’t just annoyances; they’re signs that the very brain of your engine, the Engine Control Module (ECM), may be failing.
A Technician’s Real-World Experience
“A customer’s 2009 Cadillac STS with the Northstar V8, which uses a very similar ECM, came into my shop last month. It had intermittent stalling and a slew of random communication codes (U-codes). The owner had already replaced the alternator and battery trying to solve what he thought was a voltage issue. After hooking up my scan tool and monitoring the live data stream, I saw the ECM module was intermittently dropping off the network entirely. We installed a VIN-programmed module just like this one, and the car has run flawlessly ever since. It saved him from chasing phantom issues and spending hundreds more on unnecessary parts.”
The Direct Solution: A VIN-Programmed 2009 XLR ECM
Don’t let a faulty computer keep your luxury roadster parked. This Engine Control Module is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and high dealership costs out of the equation. When you order, you provide us with your Vehicle Identification Number (VIN), and we program the module with the latest, most stable software directly from GM. It arrives at your door ready for a simple, plug-and-play installation.
- âś” Eliminate Guesswork: Solves common failure symptoms like rough idle, poor fuel economy, no-start conditions, and random warning lights.
- âś” Save Time and Money: No towing fees or expensive dealership programming appointments required. This is a direct-fit, pre-programmed part.
- âś” Latest GM Software: We flash the module with the newest vehicle-specific updates, ensuring optimal engine performance, fuel efficiency, and emissions control.
- âś” Seamless Integration: Because it’s programmed to your VIN, it communicates perfectly with your vehicle’s other modules, including the transmission, ABS, and security systems.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new ECM is a straightforward process that a confident DIYer can handle. While specific locations vary by model, the general steps are consistent.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the systems to fully discharge.
- Locate the ECM: On the 2009 XLR, the ECM is typically found in the right-hand front of the engine compartment. Consult your owner’s manual or a service guide for the exact location on your specific vehicle.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place and securely reconnect the wiring harnesses. You’ll hear a click as they lock in.
- Reconnect Battery: Re-attach the negative battery terminal. The vehicle may need to go through a security relearn procedure, which is often as simple as cycling the key a few times.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please verify that your vehicle is on this list and that your original part number is one of the interchangeable service numbers below.
Interchangeable Part Numbers:
12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
Vehicle Fitment List:
- 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 (ID 12636659 or 12625453)
- 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 enter your vehicle’s 17-digit VIN in the notes section during checkout. We cannot ship your order until we have this information to program the module correctly.