Is Your Cadillac DTS Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a luxury ride like the Cadillac DTS into a source of constant frustration. If you’re dealing with baffling electrical gremlins, poor performance, or a car that just won’t start reliably, the ECM is often the culprit. It’s the brain of your engine, and when it starts to fail, the symptoms can be unpredictable and difficult to diagnose.
Common Symptoms of a Failing GM ECM:
- โ Unexplained Check Engine Light with various communication or sensor codes.
- โ Engine stalling, stumbling, or hesitating during acceleration.
- โ Harsh or erratic shifting from the automatic transmission.
- โ Complete no-start condition where the engine cranks but won’t fire up.
- โ Reduced fuel economy and overall poor engine performance.
- โ Issues with specific systems, like the throttle body or fuel injectors, even after replacing the parts.
A Real-World Diagnostic Story
“A customer’s 2010 DTS came into my shop last month with a persistent P0606 code (ECM/PCM Processor Fault) and a complaint of random stalling at traffic lights. They had already spent a small fortune replacing the crankshaft position sensor and the throttle body at another shop, with no success. After verifying power and grounds to the module were solid, we knew the issue was internal to the computer. The processor was failing under thermal load. We installed one of our pre-programmed ECMs, and the car has been running flawlessly ever since. This is a classic case where chasing symptoms instead of the root cause gets expensiveโa faulty ECM was the problem all along.”
The Simple, Reliable Solution: A VIN-Programmed ECM
Forget about expensive dealership visits, towing fees, and the uncertainty of a complex repair. This genuine GM Engine Control Module, part number 12628993, is the definitive solution. We take all the guesswork out of the process. Simply provide us with your vehicle’s VIN during checkout, and our experts will program the module with the latest GM-certified software specific to your car. It will arrive at your door ready for a straightforward installation.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new 2009-2011 DTS Engine Control Module is a job most DIYers can handle in their own driveway. Follow these simple steps to get your Cadillac back to peak condition:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On the 2009-2011 Cadillac DTS, the Engine Control Module is typically located in the engine bay. Consult a service manual for the exact position if needed.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the old ECM. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the original 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 Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: In many cases, a security relearn procedure may be required, which can typically be done without special tools by cycling the key. Instructions are readily available online for this simple process. Once complete, start the engine and enjoy restored performance!
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with multiple service numbers. If your original module has one of the following part numbers, this is the correct part for you:
Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
While this listing is focused on the 2009-2011 DTS Engine Control Module, it also fits many other models like the Cadillac STS & SRX, Buick Lucerne, Chevy Corvette & Colorado, GMC Canyon & Envoy, Hummer H3, and more. Please verify the part number on your original unit to ensure a perfect match.