Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Cobalt, Malibu, HHR, or other GM vehicle suffering from frustrating and unpredictable engine problems? Issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition often point to a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This replacement PCM, part number 12635902, is the definitive solution to restore your vehicle’s reliability, fuel efficiency, and drivability. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships, ensuring a straightforward installation process.
From the Diagnostic Bay
I remember a 2009 Cobalt that came into the shop with the most bizarre symptoms. The owner complained of intermittent stalling at red lights and occasional hard shifts, but the check engine light would only come on sporadically. We checked everything – fuel pressure, spark, sensors – and couldn’t find a consistent fault. After hours of diagnostics, we hooked up a scope to the PCM’s main power and ground circuits and saw intermittent voltage drops. The internal power regulator in the original PCM was failing. We installed a VIN-programmed module just like this one, performed the quick security relearn, and the car ran perfectly. It’s a great reminder that when symptoms are inconsistent and widespread, the central computer is often the culprit.
Common Symptoms of a Failing GM PCM
- ✔ Persistent and often unexplained Check Engine Light (CEL)
- ✔ Engine stalling or cutting out while driving
- ✔ Rough or erratic idling
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication error codes with diagnostic scan tools
- ✔ Failure to pass emissions testing
The Right Solution: A Pre-Programmed 2007-2010 Cobalt PCM
Replacing a modern vehicle’s engine computer isn’t as simple as swapping a battery. The PCM is the central hub that communicates with dozens of other modules and sensors. It must be programmed with the correct software and calibration files for your specific vehicle, including its engine, transmission, and factory options. Our service eliminates the need for expensive dealership programming or specialized tools. By providing us with your VIN during checkout, you receive a module that is loaded with the latest GM-certified software updates, ready for installation right out of the box. This ensures all engine and transmission parameters are set correctly for optimal performance and longevity.
This module is a direct replacement for a wide range of service numbers, including: 12597125, 12612397, 12594750, 12629019, and 12611549. Its versatile design and our VIN-specific programming make it compatible with an extensive list of GM vehicles beyond the Cobalt, such as the Silverado 1500, Malibu, HHR, G6, Saturn Aura, Pontiac Solstice, and more. Please verify your part number or consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and the module will arrive ready to be installed with the latest GM software for your specific vehicle.
Where is the PCM located on a 2007-2010 Cobalt?
On the Chevrolet Cobalt, the PCM (or ECM) is typically located in the engine compartment on the driver’s side, often near the fuse box or battery.
What is a security or CASE relearn procedure?
After installation, some GM vehicles may require a security relearn (to sync the anti-theft system) or a CASE (Crankshaft Angle Sensor Error) relearn. The security relearn can often be done without special tools, while the CASE relearn helps the new PCM communicate precisely with the crankshaft sensor for optimal timing and misfire detection. A qualified mechanic can perform this easily.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty PCM, this replacement part will resolve the issue. It is crucial to have your vehicle properly diagnosed to ensure the PCM is the root cause of the problem.
How do I provide my VIN?
You can add your 17-digit VIN to the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship your part until we have the VIN to program it.
Is this part compatible with other service numbers?
Yes, this module is a direct replacement for multiple service numbers, including 12597125, 12612397, 12594750, 12629019, and others. It is designed to be a comprehensive solution for a wide range of GM vehicles.