Restore Your Cadillac’s Peak Performance and Reliability
Is your 2009-2011 Cadillac DTS suffering from frustrating issues like intermittent stalling, a persistent check engine light, poor fuel economy, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s performance. A faulty ECM can make your luxury vehicle feel unreliable and unpredictable. This isn’t just an inconvenience; it’s a critical component failure that needs a dependable solution.
This is a direct-fit replacement Engine Control Module, part number 12628911, which arrives at your door fully programmed to your vehicle’s specific VIN. We handle the complex part for you. By flashing the module with the latest GM software updates before it ships, we eliminate the need for an expensive trip to the dealership for programming. This saves you both time and hundreds of dollars in labor fees, getting your Cadillac back to its smooth, powerful self faster.
A Technician’s Notebook: The Phantom No-Start
I once had a 2010 DTS in my bay that was a real head-scratcher. The owner said it would randomly refuse to start, but after sitting for an hour, it would fire right up as if nothing was wrong. There were no consistent trouble codes, just a history of lost communication faults (U-codes). After checking all the usual suspects—battery, grounds, ignition switch—I focused on the ECM. On these vehicles, heat soak can cause microscopic cracks in the ECM’s internal circuits. When the module got hot, the connection would fail. When it cooled, it worked again. We replaced it with a VIN-programmed module like this one, performed the security relearn, and the phantom issue was gone for good. It’s a textbook example of how a failing ECM can cause incredibly frustrating, intermittent problems.
Is Your Vehicle Showing These Symptoms?
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Complete no-start or difficult starting conditions
- ✔ Noticeable decrease in fuel mileage
- ✔ Erratic or harsh transmission shifting
- ✔ Stored diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
- ✔ Communication errors with scan tools
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the ECM: On the 2009-2011 Cadillac DTS, the ECM is typically located inside the engine bay. Consult a service manual for the exact position if you’re unsure.
- ✔ Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely re-fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely in place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: This is a critical step. You will need to perform a security relearn procedure (often called a Passlock or Passkey relearn) to sync the new ECM with your vehicle’s anti-theft system. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle will not start until this is completed.
Verified Vehicle Compatibility
While this is a primary solution for the 2009-2011 DTS Engine Control Module, its versatile design allows it to fit a wide range of GM vehicles. Please verify your specific model and engine option below. This unit is a direct replacement for service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
- Cadillac DTS: 2009-2011
- Cadillac CTS: 2009 (6.2L)
- Cadillac SRX: 2009 (4.6L)
- Cadillac STS: 2009 (4.4L, 4.6L), 2010 (4.6L)
- Cadillac XLR: 2009 (ID 12636659 or 12625453)
- Buick Lucerne: 2009-2011 (4.6L)
- Chevrolet Colorado: 2009, 2010-2012 (2.9L, 3.7L)
- Chevrolet Corvette: 2009 (ZR1)
- Chevrolet Trailblazer: 2009 (6.0L)
- GMC Canyon: 2009, 2010-2012 (2.9L, 3.7L)
- GMC Envoy: 2009 (5.3L)
- Hummer H3: 2009, 2010 (3.7L)
- Saab 9-7x: 2009
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to your specific VIN before we ship it. You will only need to perform the vehicle’s security relearn procedure after installation, which requires no special tools.
How do I provide my VIN?
Simply enter your 17-digit Vehicle Identification Number (VIN) during the checkout process. This is crucial for us to ensure the module is a perfect match for your vehicle’s systems.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (e.g., codes P0601, P0606), then this replacement part is the correct fix. It’s always best to have the codes professionally diagnosed to confirm the ECM is the root cause.
Is this part difficult to install for a DIYer?
The physical replacement is straightforward for someone with basic mechanical skills. It involves disconnecting the battery, unplugging connectors, and swapping the module. The most important part is completing the security relearn procedure correctly afterward.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM (Engine Control Module) specifically controls engine functions. A PCM (Powertrain Control Module) controls both the engine and the transmission. For your vehicle, this module serves as the primary engine computer.
Does this part come with a warranty?
Yes, all of our electronic modules come with a warranty that protects you against defects. Please see the warranty tab for full details and duration.