Restore Peak Performance to Your Cadillac DTS
Is your 2009-2011 Cadillac DTS suffering from baffling electrical gremlins, poor engine performance, or an illuminated Check Engine Light that won’t go away? The Engine Control Module (ECM) is the sophisticated brain of your vehicle, and when it starts to fail, it can cause a host of frustrating and difficult-to-diagnose problems. From my 20+ years in the repair bay, I’ve seen how a faulty ECM can mimic other issues, leading to wasted time and money on unnecessary parts. This replacement Engine Control Module, part number 12630464, is the definitive solution to get your luxury sedan running smoothly and reliably again.
The biggest hurdle with ECM replacement has always been the expensive and inconvenient programming required at a dealership. We eliminate that step completely. When you order, simply provide us with your vehicle’s VIN. Our technicians will then program this module with the latest official GM software specific to your car. It arrives at your door ready for a straightforward installation, making this a job that a confident DIYer or any professional shop can complete quickly.
A Technician’s Notebook
I remember a 2010 Cadillac DTS that came into the shop with a complaint of intermittent stalling at stoplights and a persistent U0100 ‘Lost Communication with ECM’ code. The owner had already replaced the fuel pump and a few sensors with no luck. The symptoms were erratic—sometimes it ran perfectly, other times it would barely stay running. After hooking up our professional scan tool and monitoring data streams, we saw the ECM’s voltage reference was dropping out intermittently. This wasn’t a sensor or wiring issue; the computer itself was failing internally. We installed a VIN-programmed ECM just like this one, and the car ran flawlessly. It saved the customer from further guesswork and restored their confidence in their vehicle.
Is Your Cadillac Showing These Symptoms?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty ECM is a likely culprit:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other communication errors (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ A noticeable decrease in fuel economy.
- ✔ The engine misfires, but spark plugs and coils are good.
- ✔ Issues with the automatic transmission shifting incorrectly.
- ✔ The cooling fans run constantly, even when the engine is cold.
A Straightforward Guide to Installation
With our pre-programming service, installing your new 2009-2011 DTS ECM is a simple swap. No specialized computer equipment is needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On the Cadillac DTS, the ECM is typically located in the engine bay. Consult your owner’s manual or a repair guide for the exact position.
- Disconnect the Module: Carefully unplug the wiring harness connectors from the old ECM. There are usually locking tabs that need to be released.
- Remove the Old Unit: Unbolt the old ECM from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed ECM in place and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module. You should hear or feel a click. Reconnect the negative battery terminal.
- Final Steps: Your vehicle may need to complete a security relearn procedure, which typically involves cycling the key. This is a simple process you can do in your driveway.
Verified Vehicle Compatibility
This module, part number 12630464, is a direct replacement for a wide range of GM vehicles. It is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, and 12678512. Please confirm your vehicle is on the list below:
- Cadillac DTS 2009-2011
- Cadillac CTS 2009 (6.2L)
- Cadillac SRX 2009 (4.6L)
- Cadillac STS 2009-2010 (4.4L, 4.6L)
- Cadillac XLR 2009
- Buick Lucerne 2009-2011 (4.6L)
- Chevrolet Colorado 2009-2012 (2.9L, 3.7L)
- Chevrolet Corvette 2009 (ZR1)
- Chevrolet Trailblazer 2009 (6.0L)
- GMC Canyon 2009-2012 (2.9L, 3.7L)
- GMC Envoy 2009 (5.3L)
- Hummer H3 2009-2010 (3.7L)
- Saab 9-7X 2009
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the ECM with the exact software and calibrations for your specific vehicle’s engine, transmission, and options. This ensures it works correctly right out of the box, without any additional programming.
Is this a difficult part to install myself?
For someone with basic mechanical skills, this is a very manageable job. The main tasks are disconnecting the battery and swapping the module. Since we handle the programming, you avoid the most complex part of the process.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the ECM (like code P0601), then yes, this part will resolve the issue. It’s crucial to ensure the problem isn’t with a sensor or wiring that the ECM is monitoring.
What if I install it and my car still won’t start?
After installation, your car’s anti-theft system may need to perform a security relearn. This procedure is simple and can be found in your owner’s manual or online. It usually involves turning the key to the ‘ON’ position for 10-15 minutes. If problems persist, double-check all connections.