Is your Pontiac G6, Chevy Malibu, or other GM vehicle running poorly, stalling unexpectedly, or showing a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer responsible for managing your engine’s performance, fuel economy, and emissions. A faulty PCM can lead to a cascade of frustrating issues, but this pre-programmed module is the reliable, straightforward solution to get your vehicle back on the road and running like new.
This is a genuine GM engine computer, service number 12597125, which is a direct replacement for part number 12635901 and several other service numbers. We take the guesswork out of the repair by programming the module specifically for your vehicle using the VIN you provide at checkout. This ensures that all factory settings, engine parameters, and security information are a perfect match, simplifying the installation process significantly. The module arrives with the latest software updates from General Motors, often correcting factory bugs and improving overall performance and efficiency.
From the Diagnostic Bay
We had a 2009 Pontiac G6 come into the shop with a complaint that was stumping everyone. The car would randomly lose power, the transmission would shift erratically, and the check engine light would flicker on and off with a host of communication error codes (U-codes). The owner had already replaced the throttle body and a few sensors with no luck. After running a full diagnostic, we noticed the 5-volt reference signal from the PCM was fluctuating. Instead of a steady 5 volts, it was dropping intermittently, causing chaos among the sensors. We swapped in a pre-programmed PCM, performed the security relearn, and the car ran perfectly. It’s a great reminder that when multiple unrelated systems act up, the central computer is often the culprit.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine stalling or shutting off while driving
- ✔ Rough idling or misfires
- ✔ Poor fuel economy
- ✔ Failure to pass emissions tests
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with diagnostic scan tools
Why Choose a VIN-Programmed 2008-2010 G6 PCM?
Replacing a modern engine computer isn’t as simple as swapping a battery. The PCM is tied directly to your vehicle’s security system (Pass-Key, Passlock, or VATS) and contains specific data for your engine, transmission, and emissions equipment. Our professional VIN programming service handles this critical step for you. By flashing the unit with your car’s unique information and the newest GM calibrations, we ensure it communicates flawlessly with all other modules in your vehicle. This plug-and-play approach saves you a costly trip to the dealership for programming and gets your repair done faster.
This module is compatible with a wide range of General Motors vehicles beyond the Pontiac G6. Please verify your original part number matches one of the following service numbers: 12612397, 12594750, 12597125, 12629019, 12635902, or 12611549. It is a direct fit for models such as the Chevy Cobalt, HHR, Malibu, Impala, Silverado 1500 (4.3L), Saturn Aura, Vue, and more within the specified years. Refer to the detailed fitment list to confirm compatibility with your exact make, model, and engine option.
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, including fuel injection timing, spark advance, idle speed, and transmission shift points, to ensure optimal performance, fuel efficiency, and low emissions.
Do I need to get this part programmed?
No, we handle the programming for you before we ship the part. You must provide your vehicle’s 17-digit VIN during or after checkout so we can load the correct software and calibrations for your specific car. This makes installation much simpler.
Is installation difficult?
Physically replacing the module is typically straightforward, involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old unit. However, after installation, you may need to perform a security relearn procedure (also known as a key relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure can usually be done without special tools and instructions can be found online or in a service manual.
How do I know if my old PCM is definitely the problem?
Diagnosing a faulty PCM can be tricky. It’s best to have a qualified technician perform a full diagnostic scan. However, if you are experiencing multiple, seemingly unrelated issues like random stalling, communication error codes (U-codes), and erratic sensor readings, the PCM is a very likely cause.
Will this fix my car’s check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, if the light is on due to a faulty sensor (like an oxygen sensor or MAP sensor), you will still need to replace that specific component. This PCM will solve problems originating from the computer itself.