Is Your GM Vehicle Running Rough?
If you’re dealing with frustrating and unpredictable issues like your 2007-2010 Cobalt stalling at red lights, erratic transmission shifting, or a persistent check engine light that no amount of part-swapping seems to fix, the problem often points to the very brain of your vehicle: the Powertrain Control Module (PCM), also known as the ECM.
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing PCM can wreak havoc. It controls everything from fuel injector pulses to spark timing and automatic transmission operation. When it starts to fail, the symptoms can be confusing and lead you down a costly rabbit hole of replacing perfectly good sensors and components.
Expert Pro Tip: Check Your Grounds First!
Before you condemn your PCM, do yourself a favor and check the main engine and body ground connections. On these GM platforms, I’ve diagnosed countless vehicles where a corroded or loose ground strap (especially the one on the engine block or near the transmission) was causing voltage fluctuations that mimicked a bad PCM. A few minutes with a wire brush can save you hundreds of dollars. Always confirm you have solid power and ground at the PCM connectors before replacing the unit.
The Reliable, Hassle-Free Solution
This isn’t just a part in a box; it’s a complete solution. This PCM, compatible with service number 12635902 and others, comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This is the single most critical step in the process. Without correct programming, the vehicle won’t start, the anti-theft system will engage, and it simply will not function.
We handle the complex part for you. By flashing the module with the latest GM-certified software updates before it ships, we ensure it’s truly a plug-and-play replacement. You avoid the expensive trip to the dealership and the high cost of their programming service.
Common Symptoms of a Failing GM PCM:
- ✔ Unexplained engine stalling or shutting off while driving.
- ✔ No-start condition where the engine cranks but won’t fire up.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Multiple, unrelated Diagnostic Trouble Codes (DTCs) being stored.
- ✔ Communication errors with your scan tool.
- ✔ Poor fuel economy and overall reduced engine performance.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with several service numbers. If your original module has one of the following numbers on its label, this is the correct part for you:
Compatible Service Numbers: 12597125, 12612397, DL216140, 12594750, 12629019, 12635902, 12611549.
Installation is straightforward. Once you receive the pre-programmed module, simply disconnect the battery, remove the connectors from your old PCM, unbolt it, and install the new one in its place. After reconnecting everything, you will likely need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. This process is simple and requires no special tools.