Restore Your Vehicle’s Performance and Reliability
Is your vehicle suffering from frustrating issues like a persistent Check Engine Light, poor fuel economy, intermittent stalling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM). As the brain of your vehicle’s powertrain, a faulty ECM can disrupt everything from ignition timing to fuel delivery, leaving you stranded and facing a costly dealership repair. This isn’t just an inconvenience; it’s a critical component for your vehicle’s health and safety.
We offer a direct, reliable solution. This Engine Control Module, part number 12622175, is the definitive fix for a wide range of GM vehicles. The best part? We handle the programming for you. Before we ship, we will flash the module with the latest official GM software updates, precisely matched to your vehicle using the VIN you provide at checkout. This means you receive a component that is ready for installation right out of the box, eliminating the need for expensive programming services at a dealership. Get your car, truck, or SUV running smoothly again with a dependable, correctly prepared 2009 CTS Engine Module.
A Technician’s Notebook: The Intermittent Stall Case
I remember a 2010 GMC Canyon that came into my shop with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random communication errors. After checking all the usual suspects—fuel pressure, wiring harnesses, grounds—I focused on the ECM. On the surface, it seemed fine. But by monitoring live data during a long test drive, I saw the processor voltage dip erratically just before a stall. The ECM was failing internally under thermal stress. We replaced it with a VIN-programmed unit like this one, and the problem was solved instantly. It’s a perfect example of how a failing computer can create ghost-like issues that are impossible to pin down without experience.
Common Signs of a Failing GM ECM
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0606, or U-series communication codes.
- ✔ The engine cranks but will not start.
- ✔ Noticeable drop in fuel efficiency.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Loss of communication with other vehicle modules.
Your Straightforward Installation Guide
Replacing your 2009 CTS Engine Module is a manageable job for a DIY enthusiast. Since this unit arrives pre-programmed, no special computer tools are required for the installation itself. Always consult a vehicle-specific repair manual if you are unsure.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On most of these GM models, the ECM is found in the engine compartment, often on the firewall, inner fender, or near the air cleaner box. It’s a metal box with large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that may need to be squeezed or lifted. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Firmly reconnect the wiring harness connectors, ensuring they click and lock securely. A poor connection is a common source of post-installation issues.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle may need to go through a brief idle relearn procedure, which typically involves starting it and letting it idle for a few minutes.
Verified Vehicle Compatibility
This module is a direct replacement for a wide array of General Motors vehicles and is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12630464, and 12678512. Please verify your part number and application below. This is a dependable solution for more than just a 2009 CTS Engine Module.
- CADILLAC CTS 09 (6.2L)
- CADILLAC DTS 09-11
- CADILLAC SRX 09 (4.6L)
- CADILLAC STS 09 (4.4L or 4.6L)
- CADILLAC STS 10 (4.6L)
- CADILLAC XLR 09 (ID 12625453 or 12636659)
- CHEVROLET COLORADO 09-12
- CHEVROLET CORVETTE 09 (ZR1)
- CHEVROLET TRAILBLAZER 09 (6.0L)
- GMC CANYON 09-12
- GMC ENVOY 09 (5.3L)
- HUMMER H3 09-10
- BUICK LUCERNE 09-11 (4.6L)
- SAAB 9-7X 09
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the correct, vehicle-specific software from GM. This ensures perfect compatibility with your engine, transmission, and factory options, making the installation process simple and effective.
Is this module difficult to install?
For someone with basic mechanical skills, the physical swap is straightforward. Since we program it beforehand, you avoid the most complex part of the job. You will not need a high-end scan tool for programming. See our installation guide above for the basic steps.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal failure of the original ECM (e.g., DTC P0601), this replacement module will resolve the issue. However, if the light is on for another reason (like a bad oxygen sensor), that separate problem will still need to be addressed.
What happens after I install it?
After installation, your vehicle should start and run properly. Some vehicles may require a security relearn or crankshaft position sensor relearn procedure, which can often be done without special tools. Instructions are widely available online or in service manuals.
Are there any other numbers I need to match?
The primary part number is 12622175, but this unit also replaces a long list of interchangeable service numbers. As long as your vehicle is on our compatibility list and we have your VIN for programming, you will receive the correct part for your application.