Is your 2007-2010 Pontiac G5 suffering from erratic behavior, a persistent check engine light, or a no-start condition? These frustrating issues often point to a failing Powertrain Control Module (PCM), the central computer responsible for managing your engine’s performance, fuel economy, and emissions. Don’t let a faulty computer keep you off the road. This is your direct, plug-and-play solution to restore your vehicle’s factory performance and reliability.
This listing is for a genuine GM engine computer, service number 12635901, which is a direct replacement for multiple service numbers including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. We take the guesswork and hassle out of the replacement process. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will program the module with the latest GM-certified software specific to your car. This ensures perfect compatibility and function right out of the box, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2009 Pontiac G5 come into the shop with a list of bizarre symptoms the owner had been chasing for months. It would randomly stall at stoplights, the transmission would shift hard, and the check engine light would come on and off with a mix of communication and sensor codes. Multiple shops had replaced sensors to no avail. When we hooked up our high-level scanner, we could see the data stream from the PCM dropping out intermittently. It was a classic case of an internal computer failure that wasn’t setting a clear ‘bad PCM’ code. We installed one of our pre-programmed modules, performed the security relearn, and the car ran like it just rolled off the assembly line. It’s a reminder that the PCM is the brain, and when it’s sick, the whole body suffers.
Is Your Pontiac G5 Exhibiting These Symptoms?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Unexplained drop in fuel mileage.
- ✔ Engine stalling, stumbling, or running rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Error codes related to internal processor failure (e.g., P0601, P0606).
Why Choose Our Pre-Programmed Pontiac G5 PCM?
Your vehicle’s PCM is a critical component, and getting the right one is essential. Our process ensures you receive a fully functional module that is 100% compatible with your Pontiac G5. We flash the unit with your car’s specific calibration files based on the VIN you provide. This process accounts for the engine, transmission, and all factory-installed options, making installation as simple as swapping the part. This is not a generic, one-size-fits-all solution; it’s a tailored component for your exact vehicle.
This module fits a wide range of General Motors vehicles, but this listing is specifically for owners of the 2007-2010 Pontiac G5. While it may be compatible with models like the Cobalt, Malibu, HHR, and others listed in the fitment data, it is crucial to match your original part number to ensure correct application. Installation is straightforward for a DIY mechanic, typically involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to swap in the new one. In many cases, a simple security relearn procedure (instructions can be found online or in a service manual) is the final step to get you back on the road.
What is a PCM and what does it do?
The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM) or Engine Control Unit (ECU), is your vehicle’s main computer. It controls all aspects of engine operation, including fuel injection, spark timing, emissions systems, and automatic transmission shifting, to ensure optimal performance and efficiency.
Do I need to get this programmed at a dealership?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide your VIN during checkout, and the computer will arrive at your door ready to be installed, saving you hundreds of dollars in dealer programming fees.
Where is the PCM located on my 2007-2010 Pontiac G5?
On the Pontiac G5, the PCM is typically located in the engine compartment on the driver’s side, near the fuse box or firewall. It is a silver metal box with several large electrical connectors.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s important to properly diagnose the problem first. If the light is on due to a bad sensor or another component, replacing the PCM will not fix the underlying issue.
What is a security or anti-theft relearn procedure?
Most GM vehicles have an anti-theft system (Passlock/VATS) that links the PCM to your key and ignition. After installing a new PCM, you may need to perform a simple ‘relearn’ procedure so the system recognizes the new computer. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle two or three times. Specific instructions are widely available online.