Is Your Cadillac DTS Running Rough? The ECM Might Be the Culprit.
If your 2009, 2010, or 2011 Cadillac DTS is experiencing perplexing issues like stalling, poor fuel mileage, erratic shifting, or a persistent check engine light, the root cause is often a failing Engine Control Module (ECM). As the central computer of your vehicle, the ECM manages everything from fuel injection and ignition timing to transmission signals. When it begins to fail, it can create a cascade of problems that are difficult to diagnose. This replacement ECM, part number 12678512, is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
From the Diagnostic Bay
We once had a 2010 Cadillac DTS come into the shop with a list of complaints that had other mechanics stumped. The owner reported random stalling at stoplights, occasional hard shifts, and a check engine light that would come and go. Scans showed intermittent communication errors with various sensors. After verifying the wiring harness and sensor integrity, we focused on the ECM. On the surface, it seemed fine, but under load, its internal processors were failing. We installed a VIN-programmed ECM just like this one, and it was like a new car. All the ghost-like issues vanished instantly. It’s a perfect example of how a single component—the ECM—can mimic a dozen other problems.
The Plug-and-Play Solution for Your Cadillac
The biggest hurdle in replacing an ECM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. When you order this module, you simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the unit with the latest, most stable GM-certified software specific to your exact vehicle configuration. This ensures that when the part arrives, it’s ready for installation, saving you hundreds of dollars in dealer fees and towing costs. It’s the most efficient way to get your DTS back on the road.
Common Symptoms of a Failing 2009-2011 DTS ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Unexplained engine stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Communication error codes (U-codes) when scanned.
- ✔ Failure to pass state emissions testing.
Guaranteed Compatibility and Reliability
This Engine Control Module is a direct replacement for a wide range of GM vehicles, ensuring a perfect fit and function. It is interchangeable with several service numbers, including 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, and 12630464. While this listing focuses on the 2009-2011 DTS ECM, it also fits models like the Buick Lucerne, Chevrolet Corvette, GMC Envoy, Hummer H3, and more, as detailed in our fitment guide. Each unit is meticulously tested to ensure it meets or exceeds original equipment standards for performance and longevity. By installing this pre-programmed module, you are restoring your vehicle’s core operational integrity with a reliable and cost-effective part.
Frequently Asked Questions
Do I need to program this ECM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready to install.
Where can I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) is typically located on a metal plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my car’s specific problem?
This module will correct any issues directly caused by a faulty ECM. While the symptoms listed are common indicators of ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the source of the problem before ordering.
Is any additional setup required after installation?
In some cases, a simple ‘Security Relearn’ procedure may be necessary, which typically involves cycling the key in the ignition. This procedure does not require any special tools and we can provide instructions if needed.
Is this a brand new part?
This is a high-quality, fully tested replacement part that is guaranteed to function to original equipment specifications. Each unit undergoes rigorous checks to ensure reliability and performance.
How do I provide my VIN to you?
You can enter your VIN in the notes section during the checkout process or simply reply to your order confirmation email with the information. We cannot ship your part until we receive the VIN.