Is your 2009-2011 Cadillac DTS experiencing frustrating issues like stalling, erratic idling, 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, making your luxury car feel unreliable. Don’t let a bad module keep you off the road or lead to expensive, incorrect repairs.
This is your direct-fit, hassle-free solution. We are offering a genuine GM Engine Control Module, part number 12628993, that arrives at your doorstep fully programmed to your specific vehicle. Before we ship, we flash the module with the latest GM-authorized software updates using the Vehicle Identification Number (VIN) you provide. This critical service eliminates the need for a costly trip to the dealership for programming, saving you time, money, and the headache of scheduling appointments. It’s the most efficient way to restore your Cadillac’s performance and dependability.
Key Signs of a Failing Engine Computer
- ✔ Check Engine Light is on with communication-related or internal processor fault codes (e.g., P0601, P0606, U0100).
- ✔ The engine cranks but will not start.
- ✔ Intermittent stalling or stumbling, especially after the engine has warmed up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Communication loss with other vehicle modules, causing multiple warning lights on the dash.
From the Diagnostic Bay: A Tricky DTS Diagnosis
I remember a 2010 Cadillac DTS that came into my shop with a maddeningly intermittent no-start problem. The owner had already replaced the battery and starter with no luck. When it acted up, there was no spark and no fuel injector pulse. The scan tool would lose communication with the ECM. After checking all the power and ground circuits to the module, I suspected an internal failure. By using a heat gun to gently warm the ECM, I could replicate the failure every single time. The processor on the circuit board was failing under thermal stress. Replacing the module with a pre-programmed unit like this one solved the problem permanently, saving the customer from further guesswork and the high cost of dealership diagnostics.
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 located in the engine bay. Consult a service manual for the precise location if you are unsure.
- ✔ Disconnect Connectors: Carefully unlatch and remove the electrical connectors from the old ECM. Inspect them for any signs of corrosion or damage.
- ✔ Swap the Modules: Unbolt and remove the old module from its mounting bracket. Install the new, pre-programmed module in its place and secure it.
- ✔ Reconnect Everything: Plug the electrical connectors firmly into the new ECM. Reconnect the negative battery terminal.
- ✔ Final Steps: In many GM vehicles, a security relearn procedure may be required to sync the new ECM with your vehicle’s anti-theft system. This can often be done without special tools and instructions are widely available online. Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This ECM is a direct replacement for a wide range of General Motors vehicles. While this listing is focused on the 2009-2011 DTS ECM, it also fits the following models. Please verify your specific application.
CADILLAC CTS (2009, 6.2L) | CADILLAC DTS (2009-2011) | CADILLAC SRX (2009, 4.6L) | CADILLAC STS (2009-2010, 4.4L/4.6L) | CADILLAC XLR (2009) | CHEVROLET COLORADO (2009-2012) | CHEVROLET CORVETTE (2009, ZR1) | CHEVROLET TRAILBLAZER (2009, 6.0L) | GMC CANYON (2009-2012) | GMC ENVOY (2009, 5.3L) | HUMMER H3 (2009-2010) | BUICK LUCERNE (2009-2011, 4.6L) | SAAB 9-7X (2009)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the correct software and calibrations for your specific vehicle’s engine, transmission, and options. This ensures seamless integration and proper function right out of the box.
Is this ECM difficult to install?
For someone with basic mechanical skills, the installation is very straightforward. It involves disconnecting the battery, unplugging the old module, swapping it with the new one, and reconnecting everything. The most important step is ensuring the VIN you provide is correct for programming.
Will I need to do anything after installation?
After installation, some GM vehicles require a security relearn procedure to allow the engine to start. This procedure pairs the new ECM to your car’s anti-theft system and typically involves a sequence of key turns. It does not require a dealer scan tool.
Is this a used part?
This is a high-quality, tested component that has been inspected and prepared for service. It is programmed with fresh, factory-authorized software to ensure reliability and performance, serving as a dependable replacement for your original failed unit.
What if my original part number is different?
No problem. This ECM, part number 12628993, directly supersedes and is interchangeable with several other GM service numbers, including 12636659, 12625453, and more. As long as your vehicle is on the compatibility list, this module will work perfectly.