Restore Your Cadillac’s Performance and Reliability
Is your 2009 Cadillac XLR suffering from frustrating issues like a persistent check engine light, poor fuel mileage, or a no-start condition? As a technician with over two decades of experience under the hood, I’ve seen countless drivers chase these symptoms, often replacing sensor after sensor without success. The problem frequently lies with the vehicle’s electronic brain: the Engine Control Module (ECM). This isn’t just another part; it’s the central command center for your engine’s performance, fuel delivery, and emissions systems. When it fails, the entire vehicle can feel unpredictable and unreliable.
This replacement ECM, part number 12625453, is the definitive solution to get your luxury roadster running correctly again. 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 with the latest GM software updates already installed, ready for a straightforward installation. You can bypass the expensive and time-consuming trip to a dealership for programming. This is the same process we use in our own shop to ensure a fast, reliable, and effective repair.
Case Study: A Tricky Diagnosis
A few months back, a 2009 XLR was brought to my bay with a complaint of intermittent stalling at stoplights and a check engine light that other shops couldn’t solve. The codes were all over the place—random misfires, a throttle body communication fault, and even a U0100 Lost Communication with ECM/PCM code. After verifying the wiring harness and grounds were solid (a common first step), we focused on the ECM. On the surface, it seemed okay, but under load and when heat-soaked, its internal processor would fault. We installed a VIN-programmed 2009 XLR Engine Module, and the car ran perfectly. The customer was thrilled to have their car back, running smoother than it had in years. This experience highlights how a failing ECM can create a cascade of confusing symptoms that point away from the real culprit.
Common Signs of a Failing ECM
- ✔ Check Engine Light is illuminated with codes like P0601, P0606, or U-series communication faults.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Unexplained stalling, hesitation, or rough idling.
- ✔ Poor engine performance and lack of power.
- ✔ Automatic transmission shifts erratically or harshly.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow capacitors to discharge.
- ✔ Locate the Module: On your 2009 XLR, the ECM is located in the right-hand (passenger side) front of the engine compartment.
- ✔ Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- ✔ Remove Old ECM: Unbolt the mounting hardware that secures the old ECM to its bracket and remove it from the vehicle.
- ✔ Install New ECM: Mount your new, pre-programmed 2009 XLR Engine Module in place and secure it with the original hardware.
- ✔ Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Steps: The vehicle may require a security relearn procedure, which can typically be done without special tools by cycling the key. Consult your owner’s manual or a reliable service guide for the specific steps for your vehicle. Start the engine and verify the check engine light is off and the car runs smoothly.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles and is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12622175, 12630464, and 12678512. Please confirm your vehicle is on the list below. We program the module based on the VIN you provide to ensure perfect compatibility.
CADILLAC DTS 09-11
CADILLAC SRX 09 (4.6L)
CADILLAC STS 09 (4.4L, 4.6L)
CADILLAC STS 10 (4.6L)
CADILLAC XLR 09 (ID 12625453 or 12636659)
CHEVROLET COLORADO 09-12 (2.9L, 3.7L)
CHEVROLET CORVETTE 09 (ZR1)
CHEVROLET TRAILBLAZER 09 (6.0L)
GMC CANYON 09-12 (2.9L, 3.7L)
GMC ENVOY 09 (5.3L)
HUMMER H3 09-10 (3.7L)
BUICK LUCERNE 09-11 (4.6L)
SAAB 9-7X 09
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-certified software for your specific car. It arrives ready to install.
Is this a new or used part?
This is a high-quality, tested replacement part, guaranteed to meet or exceed original equipment performance. We ensure every module is fully functional and programmed with the latest stable software from GM.
Will this 2009 XLR Engine Module fix my car’s specific problem?
This module is the correct solution for issues caused by a faulty ECM, such as the symptoms listed above. While it solves a very common point of failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the root cause of your vehicle’s issues before ordering.
What is the security relearn procedure?
This is a simple procedure that syncs the new ECM with your vehicle’s anti-theft system. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle two or three times. This allows the components to recognize each other and enables the engine to start.
Where do I provide my VIN?
You can enter your vehicle’s VIN in the designated box on the checkout page. Please double-check it for accuracy, as this is critical for correct programming.