Restore Peak Performance to Your Cadillac DTS
Is your 2009-2011 Cadillac DTS running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs that the heart of your engine management system—the Engine Control Module (ECM)—may be failing. Don’t let a faulty computer keep your luxury vehicle sidelined. This replacement ECM, part number 12628911, is the reliable, straightforward solution to bring back the smooth, powerful performance you expect from your Cadillac.
The biggest hurdle in replacing an ECM is typically the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. When you order, simply provide us with your vehicle’s VIN. Our technicians will then flash this module with the latest, most stable GM-certified software specific to your car. It arrives at your door ready for installation, saving you hundreds in potential programming and towing fees.
From the Diagnostic Bay: The Intermittent No-Start Mystery
A customer brought in their 2010 Cadillac DTS with a frustrating problem: it would randomly refuse to start. No crank, no click, nothing. Then, an hour later, it would fire up like nothing was wrong. There were no consistent trouble codes, making it a diagnostic nightmare. After verifying the battery, starter, and ignition switch were all healthy, my experience pointed toward the ECM. On these Northstar-equipped vehicles, I’ve seen internal ECM solder joints and processors fail from heat cycles, causing these exact intermittent communication drops. We installed one of our VIN-programmed modules, and the problem was solved instantly. The customer avoided a costly dealership diagnostic fee and got a permanent fix that restored their confidence in the car.
Is Your Cadillac Showing These Signs of ECM Failure?
A failing engine computer can cause a wide range of symptoms. If you’re experiencing any of the following, a faulty ECM is a likely culprit. Look out for Diagnostic Trouble Codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling, stuttering, or misfiring
- ✔ Complete no-start or intermittent starting issues
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
A Straightforward Guide to Installation
Replacing the ECM on your vehicle is a manageable job for a DIY enthusiast. Following these steps will ensure a smooth process. Always consult a vehicle-specific service manual if you are unsure about any step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On the 2009-2011 DTS, the Engine Control Module is typically located in the engine bay. Check your service manual for the exact position.
- Disconnect Wiring: Carefully unlatch and remove the electrical connectors from the old ECM. Inspect the connectors for any signs of corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Wiring: Firmly plug the electrical connectors into the new module until they click into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which often involves turning the key to the ‘On’ position for 10-15 minutes. Check your owner’s manual for specifics.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. While this is a primary fit for the 2009-2011 DTS Engine Module, it also fits the models listed below. It is interchangeable with service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
- Cadillac CTS (2009)
- Cadillac DTS (2009-2011)
- Cadillac SRX (2009)
- Cadillac STS (2009-2010)
- Cadillac XLR (2009)
- Buick Lucerne (2009-2011)
- Chevrolet Colorado (2009-2012)
- Chevrolet Corvette (2009)
- Chevrolet Trailblazer (2009)
- GMC Canyon (2009-2012)
- GMC Envoy (2009)
- Hummer H3 (2009-2010)
- Saab 9-7X (2009)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact factory software for your car’s specific options, engine, and transmission. This ensures perfect communication between the ECM and all other vehicle systems, making the installation process plug-and-play without needing a trip to the dealer.
Is any additional programming required after installation?
No. This module arrives fully programmed to your VIN. In most cases, you will simply need to perform a security relearn procedure (often called a ‘key-on’ relearn), which can be done without any special tools and is detailed in your owner’s manual.
Will this fix my specific problem?
This ECM is a direct solution for failures within the module itself, which cause the symptoms and trouble codes listed. However, it’s crucial to ensure your vehicle’s issue has been properly diagnosed. Problems with wiring, sensors, or other components can sometimes mimic ECM failure.
Where is the ECM located on my 2010 Cadillac DTS?
On the 2009-2011 Cadillac DTS, the Engine Control Module is generally located in the engine compartment. It is often found near the air filter housing or on one of the inner fenders. Always confirm the location with a vehicle-specific repair guide before starting work.
Is this part compatible with other part numbers?
Yes, this ECM is a direct replacement for several service numbers, including 12636659, 12628993, 12625453, and others listed in the description. Ordering this part ensures you receive a compatible and correctly programmed module.