Is Your Cadillac CTS Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience under the hood, I’ve seen firsthand the frustration a failing Engine Control Module (ECM) can cause. Your vehicle’s performance plummets, fuel economy suffers, and you might even be left stranded. The ECM is the central computer for your engine, and when it starts to fail, it can create a cascade of confusing and costly problems. This isn’t just a part; it’s the solution to getting your vehicle’s reliability and power back.
This listing is for a genuine GM Engine Control Module, part number 12678513, which is the direct replacement for your original unit. The best part? We handle the complex programming for you. Simply provide your vehicle’s VIN during checkout, and our experts will flash the module with the latest, most stable software directly from GM. It arrives at your door ready to install, saving you a trip to the dealership and their expensive programming fees.
Common Symptoms of a Failing GM ECM:
If you’re experiencing any of the following, a faulty engine computer is a likely culprit. I’ve diagnosed hundreds of these specific issues in my shop, and they almost always point back to the ECM.
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601, P0606, or other communication errors.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication loss with other vehicle modules.
Expert Pro Tip from 20+ Years on the Job:
Before you replace your ECM, do a quick but critical check. Locate the main engine-to-chassis ground strap. Over time, these can corrode or become loose, creating high resistance. I’ve seen dozens of vehicles, especially the high-performance models like the CTS-V and Corvette, come in with classic ECM failure symptoms that were actually just a bad ground. A simple cleaning of the contact points with a wire brush can sometimes solve the issue and save you hundreds. If the ground is solid, the ECM is your next logical step.
Why Our 2010–2015 CTS ECM is the Smart Choice
We don’t just sell parts; we provide complete, ready-to-install solutions. This module is meticulously prepared to ensure it works perfectly with your vehicle from the moment you plug it in. Forget about the hassle of finding a shop with the right tools—we’ve done the hard work for you.
Plug-and-Play Installation: No Dealer Visit Required
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On most of these vehicles, the ECM is found in the engine compartment, often on the right-hand (passenger) side, sometimes near the firewall or inner fender.
- Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old module. Inspect the connectors for any corrosion or bent pins.
- Remove Old Module: Unbolt the original ECM from its mounting bracket.
- Install New Module: Mount your new, pre-programmed ECM and securely reconnect the wiring harnesses. You should hear a distinct ‘click’.
- Reconnect Battery: Re-attach the negative battery terminal. Your vehicle is now ready to start. Some vehicles may require a security relearn procedure, which can typically be done without special tools.
Guaranteed Fitment & Compatibility
This 2010–2015 CTS ECM is a direct replacement for service numbers 12678513 and 12633264. It is guaranteed to fit and function in the following vehicles with the specified options:
- Cadillac CTS: 2010-2013 (6.2L), 2014 (6.2L – Coupe, Sedan, SW), 2015 (Coupe)
- Chevrolet Camaro: 2012 (3.6L/6.2L, ID 12633264), 2013-2015 (6.2L, VIN P)
- Chevrolet Corvette: 2010-2013 (6.2L, VIN R or T, opt LS9)
- Chevrolet Colorado / GMC Canyon: 2010-2012 (5.3L)
- Chevrolet Malibu: 2010-2012 (3.6L)
- Hummer H3: 2010 (5.3L)
Don’t let a faulty computer keep your car off the road. Order today and restore the performance and reliability you expect from your vehicle.