Restore Peak Performance to Your Cadillac DTS
Is your 2009-2011 Cadillac DTS experiencing perplexing engine issues like stalling, rough idling, or a persistent check engine light? The Engine Control Module (ECM), the central computer of your vehicle, is often the source of these frustrating problems. It governs everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the entire vehicle’s performance and reliability are compromised. This replacement ECM, part number 12628911, is the definitive solution to restore your vehicle’s original functionality and driving pleasure.
From the Diagnostic Bay
We once had a 2010 Cadillac DTS in the shop that had its owner chasing ghosts for weeks. The car would intermittently stall at red lights and had a vague ‘U’ communication code that wouldn’t pinpoint a specific sensor. The owner had already replaced the throttle body and a camshaft position sensor with no success. After running a full network diagnostic, we noticed the ECM would periodically drop offline for a split second. It wasn’t long enough to set a hard fault every time, but it was enough to disrupt engine operation. Installing a correctly programmed ECM resolved all the issues instantly. It’s a reminder that when multiple, unrelated systems act up, the central controller is a prime suspect.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling, stumbling, or misfiring unexpectedly
- ✔ Complete no-start or difficult starting conditions
- ✔ Noticeable decrease in fuel efficiency
- ✔ Erratic or harsh automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ Loss of power or hesitation during acceleration
The Direct Solution: A Programmed 2009-2011 DTS Engine Control Module
Don’t settle for a generic, unprogrammed module that will cause more headaches. We take the guesswork out of the repair by pre-programming this unit specifically for your vehicle. When you place your order, simply provide us with your Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable GM-certified software for your exact 2009-2011 DTS Engine Control Module. This ensures that all factory settings for your engine, transmission, and options are perfectly matched, making installation much smoother.
This module is a direct replacement for service number 12628911 and is also interchangeable with the following part numbers: 12636659, 12639300, 1263605, 12628993, 12625453, 12622175, 12630464, and 12678512. It fits a wide range of GM vehicles beyond the Cadillac DTS, including select model years of the Envoy, STS, Colorado, Trailblazer, Hummer H3, CTS, SRX, Canyon, Saab 9-7x, XLR, Corvette, and Lucerne. Please verify the part number to ensure proper fitment for your application.
After installation, a standard security relearn procedure (also known as a CASE relearn or anti-theft relearn) will likely be necessary for the vehicle to start and run. This procedure pairs the new ECM with your vehicle’s security system and can often be performed without special tools. We recommend consulting your vehicle’s service manual or a qualified technician for the specific steps.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the Engine Control Module with the exact software and calibrations specified by GM for your car’s engine, transmission, and factory options. This step is critical for ensuring proper function and avoiding compatibility issues.
Is this part difficult to install?
The physical installation is straightforward for someone with moderate mechanical skill, as it typically involves disconnecting the battery and swapping the module. However, a post-installation security relearn procedure is required. If you are not comfortable with this process, we recommend seeking assistance from a professional mechanic.
What is a security relearn procedure?
A security relearn, or anti-theft relearn, is a sequence of steps that synchronizes the new ECM with your vehicle’s existing keys and anti-theft system. Without this procedure, the vehicle’s security system will prevent the engine from starting. The process usually involves a series of key turns and waiting periods.
How can I be sure my old ECM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a professional diagnosis performed. A mechanic can use a scan tool to check for specific ECM-related fault codes (like P0600-P0606) and verify that power and ground signals to the module are correct, ruling out wiring issues.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original ECM, then yes, this replacement part will resolve the issue. However, if the light is on due to a faulty sensor or another component, that separate issue will still need to be addressed.