Is Your Cadillac, Camaro, or Corvette Running Rough?
There’s nothing more frustrating than a high-performance vehicle that won’t perform. If you’re dealing with a persistent check engine light, unexplained stalling, rough idling, or a complete no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As the brain of your vehicle’s engine, a faulty ECM can cause a cascade of baffling issues that are difficult to diagnose. In my 20+ years in the shop, I’ve seen perfectly good engines crippled by a failing computer, leaving owners stressed and facing expensive dealership diagnostic fees.
The Direct-Fit, Programmed Solution is Here
This genuine GM Engine Control Module, service number 12633264 (interchangeable with 12678513), is the definitive solution to get your vehicle back on the road. We take the guesswork and hassle out of the repair. Before this module ships, we professionally program it with the latest GM-certified software, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This means no expensive trips to the dealer for programming or key relearns. It arrives at your door ready for a straightforward, plug-and-play installation.
A Real-World Scenario: The Heat-Soak Gremlin
“A customer’s 2011 CTS-V came in last month with a maddening problem: it would start and run perfectly when cold, but after a 20-minute drive, if he shut it off to get gas, it would refuse to restart for an hour. There were no consistent trouble codes, just intermittent communication faults. After checking the usual suspects (fuel pump, crank sensor), we focused on the ECM. These modules, especially when packed into a hot engine bay like the CTS-V’s, can develop internal solder joint fractures that only separate when heat-soaked. We swapped in a pre-programmed ECM, and the problem vanished instantly. This is a classic failure mode I’ve seen dozens of times on these platforms.”
Is Your Vehicle Experiencing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re noticing any of the following, this module is likely the fix you need:
- ✔ Unexplained check engine lights with various communication or sensor codes
- ✔ Engine stalls unexpectedly while driving or at idle
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Poor fuel economy and noticeable loss of power
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Intermittent issues that get worse as the engine warms up
Plug-and-Play Installation: No Dealer Visit Required
Installing your new ECM is a job most DIYers can handle in under an hour. While locations vary slightly, the process is generally the same. For the Cadillac CTS, you’ll find it in the right-hand front of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the systems to discharge.
- Locate the ECM: Identify the Engine Control Module. It’s a silver box with multiple large electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all wiring harness connectors from the old module. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In most cases, our programming handles this. However, on some vehicles, a simple 10-minute key cycle procedure may be needed to sync the security system. Instructions are available upon request.
Guaranteed Compatibility for Your 2010-2015 CTS ECM
This module is the correct fit for a wide range of powerful GM vehicles. By providing your VIN, you guarantee that the software loaded onto this 2010-2015 CTS ECM is a perfect match for your car’s specific options and systems. This part is also the specified replacement for many other models, including the Corvette, Camaro, Hummer H3, and GM trucks with the 5.3L engine, ensuring a high-quality, widely-trusted component.