Is your 2009-2011 Cadillac DTS running rough, stalling unexpectedly, or refusing to start? These frustrating and often intermittent issues can point directly to a failing Engine Control Module (ECM), the central computer of your vehicle. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty ECM can cripple an otherwise reliable car. This isn’t just a part; it’s the solution to restoring the smooth, powerful performance you expect from your Cadillac.
We take the guesswork and high dealership costs out of the equation. This genuine OEM 2009-2011 DTS Engine Control Module arrives at your door completely plug-and-play. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our experts will flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and function, eliminating the need for an expensive trip to the dealer for programming.
Is Your Cadillac Exhibiting These ECM Failure Signs?
- ✔️ The engine cranks but won’t start, or starts and immediately stalls.
- ✔️ A persistent Check Engine Light is on, with communication-related or internal processor fault codes (e.g., P0601, P0606, U0100).
- ✔️ Unexplained drops in fuel economy and poor engine performance.
- ✔️ Harsh or erratic automatic transmission shifting.
- ✔️ Intermittent loss of power or hesitation during acceleration.
- ✔️ Your scan tool cannot communicate with the ECM.
Case Study: The Ghost in the Cadillac
A customer brought in their 2010 DTS with a maddeningly intermittent no-start condition. It would work perfectly for days, then refuse to crank. All the usual suspects—battery, starter, relays—checked out fine. After hours of tracing wiring diagrams, we noticed the data stream from the ECM would occasionally drop out right before the failure. The module wasn’t throwing a hard code, but it was failing internally under specific thermal conditions. Replacing the ECM with a correctly programmed unit like this one solved the problem for good. It’s a classic example of how a failing 2009-2011 DTS Engine Control Module can create ghost-like electrical problems that are impossible to pin down without experience.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all modules to power down completely.
- ✔ Locate the ECM: On the Cadillac DTS and Buick Lucerne, the ECM is typically located within the lower part of the air cleaner filter box assembly. On other models, its location can vary (e.g., firewall, fender).
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, pre-programmed ECM and securely reconnect the electrical harnesses. Ensure they click into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn: This step is crucial. Turn the key to the ‘ON’ position (don’t start the engine) for 10-15 minutes. The security light on the dash should turn off. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of three cycles). The vehicle should now start and run correctly.
Verified Fitment Across Multiple GM Models
While this is the primary solution for the 2009-2011 DTS Engine Control Module, its versatile design allows it to be programmed for a wide range of GM vehicles. Please verify your part number and vehicle in the list below. This computer is a direct replacement for service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
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 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 / H3T 09-10 (3.7L)
BUICK LUCERNE 09-11 (4.6L)
SAAB 9-7X 09
Frequently Asked Questions
How do I provide my VIN?
Simply enter your 17-digit Vehicle Identification Number (VIN) in the designated box on the checkout page. We cannot process your order without it.
Is this part difficult to install?
The physical replacement is straightforward for most DIYers with basic tools. The most important part is performing the security relearn procedure correctly after installation, as detailed in our guide.
Will this fix my specific problem?
This module corrects issues directly caused by a failing ECM, such as internal processor faults (P0601) and communication errors. While it solves the most common drivability problems, always ensure a proper diagnosis has been performed.
Does this ECM come with a warranty?
Yes, all our modules come with a standard warranty against defects. Please see our warranty policy page for complete details and peace of mind.
What if I have the old part number 12628911?
This module, part number 12625453, is an authorized and updated replacement for several older service numbers, including 12628911. It will function identically once programmed for your vehicle.