Restore Peak Performance to Your Cadillac DTS
Is your 2009, 2010, or 2011 Cadillac DTS suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic symptoms of a failing Engine Control Module (ECM), the central computer that governs your vehicle’s engine performance, fuel delivery, and emissions. A faulty ECM can turn your luxury ride into a source of constant frustration. This replacement Engine Control Module, part number 12639300, is the definitive solution to restore your vehicle’s reliability and smooth operation.
From the Diagnostic Bay
We had a 2010 Cadillac DTS come into the shop with a complaint of intermittent stalling at stoplights and a check engine light that would come and go. The owner had already replaced the spark plugs and an ignition coil with no success. Our scan tool showed a loss of communication with several sensors, but the wiring checked out perfectly. Experience pointed us to the ECM. After swapping in a pre-programmed module just like this one, all the ghost codes vanished, and the car ran flawlessly. It’s a reminder that sometimes the most confusing electronic issues trace back to the vehicle’s brain.
Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic idling.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Transmission shifting problems or harsh gear changes.
- ✔ Misfire codes (e.g., P0300-P0308) even after replacing ignition components.
- ✔ Loss of power and sluggish performance.
Your Direct-Fit 2009-2011 DTS ECM Solution
Don’t let a faulty computer keep your Cadillac off the road. This module is a direct-fit replacement, but its key benefit is the included programming service. When you order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most up-to-date software directly from GM, ensuring it is perfectly matched to your vehicle’s specific configuration. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money.
This plug-and-play approach makes the repair process straightforward. Once the new module is installed, your vehicle will recognize it as its own, restoring all critical engine functions. This is the most reliable and efficient way to solve complex electronic engine problems.
Guaranteed Compatibility
This ECM is a direct replacement for a wide range of GM vehicles and is interchangeable with several service numbers. Please verify that your vehicle is on the list below and that your original module carries one of the following part numbers:
Interchangeable Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
This part will fit these makes and models with these options:
- CADILLAC CTS 2009 (6.2L)
- CADILLAC DTS 2009-2011
- CADILLAC SRX 2009 (4.6L)
- CADILLAC STS 2009 (4.4L, 4.6L)
- CADILLAC STS 2010 (4.6L)
- CADILLAC XLR 2009 (ID 12625453 or 12636659)
- 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
- BUICK LUCERNE 2009-2011 (4.6L)
- SAAB 9-7X 2009
By purchasing this pre-programmed 2009-2011 DTS ECM, you are choosing a reliable, cost-effective repair that gets your vehicle back to factory specifications without dealership hassle.
Frequently Asked Questions
Do I need to program this ECM when I receive it?
No. This ECM comes fully programmed to your vehicle. Simply provide your VIN during checkout, and our technicians will flash the module with the correct GM software before it ships.
Why do you need my VIN?
The Vehicle Identification Number (VIN) allows us to access the exact factory software and calibration files for your specific vehicle’s engine, transmission, and options. This ensures perfect compatibility and performance.
Where is the ECM located on my 2009-2011 Cadillac DTS?
On the Cadillac DTS, the ECM is typically located in the engine compartment, inside the air cleaner assembly box. Always disconnect the vehicle’s battery before attempting to remove or install the module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original ECM, then yes, this part will resolve the issue. However, if the light is on due to a faulty sensor or other mechanical problem, those issues will need to be addressed separately.
Is any special procedure required after installation?
In some cases, a security relearn procedure or a Crankshaft Variation (CASE) relearn may be necessary. These procedures are often simple and can be found in your vehicle’s service manual or performed with a capable bi-directional scan tool.