Is Your Truck Plagued by Mysterious Electrical Gremlins?
If your 2007-2009 GMC Sierra 1500 is experiencing frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the brain of your vehicle, orchestrating everything from fuel injection and ignition timing to transmission shifts. When it begins to fail, it can cause a cascade of problems that are difficult to diagnose and can lead to costly, unnecessary repairs on other components.
Don’t keep throwing parts at the problem. This direct-replacement PCM, service number 12612397, is the definitive solution to restore your truck’s performance and reliability. We take the guesswork out of the repair by pre-programming the module to your truck’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures a seamless installation process and proper communication with all other modules on your vehicle.
We had a 2008 Sierra 1500 with the 4.3L V6 come into the shop that was driving the owner crazy. The truck would randomly stall at red lights and had a check engine light for an oxygen sensor circuit. The owner had already replaced both upstream O2 sensors twice, but the code kept returning. After hooking up our professional scan tool, we noticed the live data stream for the O2 sensors was completely flatlined, not fluctuating as it should. This pointed away from the sensors and towards the computer itself. We confirmed the wiring was good, which isolated the fault to the PCM. After installing one of our VIN-programmed PCMs, the O2 sensor data immediately came back to life, the stalling issue vanished, and the truck ran perfectly. It’s a classic case of symptoms pointing to one part, while the root cause lies with the central computer.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable decrease in fuel economy
- ✔ The engine cranks but will not start
- ✔ Communication errors with diagnostic scan tools
- ✔ Failure to pass state emissions testing
The Right Solution for Your 2007-2009 Sierra 1500 PCM
This isn’t just a generic, off-the-shelf part. It’s a comprehensive solution. By providing us with your VIN during checkout, you receive a module that is loaded with the latest GM-certified software updates. These updates often address factory-identified bugs and improve engine and transmission performance beyond the original specifications. This module is a direct replacement for multiple service numbers, including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549, ensuring broad compatibility. While this is a plug-and-play installation for most functions, please be aware that a security relearn and a Crankshaft Variation (CASE) relearn procedure may be required after installation. This is a standard step for this generation of GM vehicles and can be performed by most qualified technicians with the proper scan tool.
Do I need to get this computer programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN at checkout, and we will flash the module with the correct software and the latest updates from GM for your specific vehicle. It will arrive ready to be installed.
What is a CASE relearn procedure?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. This is often necessary after replacing the PCM to prevent a P0315 trouble code and ensure accurate misfire detection. This procedure requires a compatible professional-grade scan tool and is a standard final step for this repair.
Where is the PCM located on my 2007-2009 Sierra 1500?
On the 2007-2009 GMC Sierra 1500 (and its sibling, the Silverado 1500), the PCM is typically located in the engine bay on the driver’s side, underneath the battery tray.
Will this fit other vehicles besides the Sierra?
Yes. This PCM is compatible with a wide range of GM vehicles from this era, including the Chevy Silverado, Cobalt, Malibu, HHR, Impala, Pontiac G5/G6, Saturn Aura/Vue, and more. Please refer to the detailed fitment list on this page to confirm compatibility with your specific year, make, and model.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found in several places: on a metal plate on the driver’s side of the dashboard visible through the windshield, on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.