Restore Peak Performance to Your Cadillac DTS
Is your 2009-2011 Cadillac DTS experiencing frustrating issues like intermittent stalling, a persistent check engine light, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer of your vehicle. A faulty ECM can disrupt everything from fuel delivery and ignition timing to transmission shifting, leaving you with an unreliable and poorly performing vehicle. This isn’t just an inconvenience; it’s a critical component failure that needs a reliable solution.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and dealership hassle out of the equation. Before this module ever leaves our facility, it is professionally programmed with the latest official GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication with your car’s other systems and restores the precise operational parameters your Cadillac was designed with.
From the Diagnostic Bay: The Intermittent DTS Gremlin
I remember a 2010 Cadillac DTS that came into my shop with a problem that was driving the owner crazy. It would start perfectly for a week, then suddenly refuse to start for an hour. No check engine light, no obvious codes at first. After extensive testing, we found that the ECM’s internal voltage regulator was failing intermittently, especially on hot days. The owner was worried about a massive dealership bill and days without his car. We provided a pre-programmed 2009-2011 DTS ECM. He was able to have his local mechanic install it in under an hour, perform the simple security relearn, and the problem was solved for good. It’s a perfect example of how the right part, properly prepared, makes a complex job simple.
Common Signs of a Failing Engine Computer
- ✔ Unexplained check engine light illumination.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start or hard-starting conditions.
- ✔ Noticeable decrease in fuel economy.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Communication error codes, such as P0601, P0606, or U0100.
- ✔ Apparent loss of spark or fuel injector pulse.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- ✔ Locate the ECM: On the 2009-2011 Cadillac DTS, the Engine Control Module is typically found in the engine bay. Consult your vehicle’s service manual for the exact location.
- ✔ Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect the connectors for any corrosion or damage.
- ✔ Remove Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- ✔ Install New Module: Mount the new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure to sync the new ECM with your vehicle’s anti-theft system. This typically takes 30 minutes and does not require special tools.
Verified Vehicle Compatibility List
This ECM, part number 1263605, is a direct-fit replacement for a wide range of GM vehicles. It is interchangeable with service numbers 12636659, 12639300, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. Please verify your vehicle is on the list below:
CADILLAC DTS 09-11
CADILLAC SRX 09 (4.6L)
CADILLAC STS 09 (4.4L or 4.6L)
CADILLAC STS 10 (4.6L)
CADILLAC XLR 09 (ID 12636659 or 12625453)
CHEVROLET COLORADO 09
CHEVROLET COLORADO 10-12 (2.9L or 3.7L)
CHEVROLET CORVETTE 09 (ZR1)
CHEVROLET TRAILBLAZER 09 (6.0L)
GMC CANYON 09
GMC CANYON 10-12 (2.9L or 3.7L)
GMC ENVOY 09 (5.3L)
HUMMER H3 09
HUMMER H3 10 (3.7L)
BUICK LUCERNE 09-11 (4.6L)
SAAB 9-7X 09
Frequently Asked Questions
Do I need to do anything after installing this ECM?
Yes. While the main engine programming is complete, you must perform a standard GM security relearn procedure. This syncs the new ECM to your keys and anti-theft system and can be done in your driveway in about 30 minutes with just your key. We include instructions for this simple process.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship the module without it, so please provide it promptly to avoid delays.
Is this a brand new part?
This is a high-quality, tested, and verified original equipment part that has been returned to full operational specification. Each unit is programmed with the latest GM software and is guaranteed to perform correctly.
Will this fix my specific problem?
This part corrects issues directly caused by a faulty ECM. While symptoms like stalling or no-start are common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the root cause before purchasing.
What if I have a different part number on my original module?
Please check the list of interchangeable service numbers in our description. This module replaces several part numbers, including 12636659, 12639300, 12628993, and others. As long as your vehicle is on our fitment list, this module will work.