Is Your Cobalt, Pursuit, or HHR Running Rough?
If you’re dealing with a persistent check engine light, unexplained stalling, erratic engine behavior, or a complete no-start condition in your 2005-2006 GM vehicle, the root cause is often a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shifting and emissions controls. When it begins to fail, it can create a cascade of frustrating and difficult-to-diagnose problems that won’t be fixed by replacing sensors or other components.
The Direct Solution for Your Engine Problems
This is a direct-fit replacement PCM, service number 12599714, which is the correct replacement for original part number 12589998 and several others. We take the guesswork out of the repair by programming the module specifically for your vehicle using the VIN you provide. This means it arrives at your door ready for installation, with the latest GM software updates already loaded. You can restore your vehicle’s original performance and reliability without an expensive trip to the dealership for programming.
From the Diagnostic Bay
We once had a 2006 Chevy Cobalt come in that had been to three other shops. The owner had spent a fortune replacing the throttle body, all four ignition coils, and the mass airflow sensor, but the car still had an intermittent stalling problem and a P0601 (Internal Control Module Memory Check Sum Error) code that kept returning. The issue wasn’t the parts being replaced; it was the computer telling them what to do. The original PCM had an internal fault. We installed one of our VIN-programmed modules, performed the security relearn, and the car ran perfectly. It’s a classic case of treating the disease, not just the symptoms.
Signs Your 2005-2006 Pursuit PCM May Be Failing
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic trouble codes related to PCM communication or internal errors (e.g., P0601, P0606).
- ✔ Unexplained engine stalling or hesitation during acceleration.
- ✔ Rough idling or misfires that aren’t solved by new spark plugs or coils.
- ✔ Poor fuel economy that has decreased over time.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
Guaranteed Compatibility and Simple Installation
This engine control module is a guaranteed fit for the following vehicles equipped with the 2.2L engine. Please verify your original part number matches one of the compatible service numbers listed below before ordering.
- 2005 Chevrolet Cobalt (Electronic Control Module; LH front engine compartment, ID 12589998)
- 2006 Chevrolet Cobalt (Electronic Control Module; LH front engine compartment, 2.2L, VIN F)
- 2005 Pontiac Pursuit (Electronic Control Module; LH front engine compartment, ID 12589998)
- 2006 Pontiac Pursuit (Electronic Control Module; LH front engine compartment, 2.2L)
- 2006 Chevrolet HHR (Electronic Control Module; LH rear engine compartment, 2.2L)
Compatible Service Numbers: 12599714, 12589998, 12597329, 12600882, 12600883, 12605766, 12605765
Installation is straightforward. The module is typically located in the left-hand (driver’s side) front of the engine compartment. Simply disconnect the battery, unplug the electrical connectors from the old PCM, unbolt it, and install the new one in its place. After reconnecting the battery, you will need to perform a security relearn procedure (also known as a VATS relearn), which pairs the new module to your vehicle’s anti-theft system. This procedure can be done without special tools and instructions are readily available online.
Frequently Asked Questions
What is a VIN-programmed module?
When you provide your vehicle’s 17-digit Vehicle Identification Number (VIN), we use it to load the exact GM-certified software and calibrations for your car’s specific options and systems. This ensures the module works correctly right out of the box, just like a new part from the factory, without requiring a trip to a dealer for expensive programming.
Do I need to do anything after installing this PCM?
Yes. After installing the module and reconnecting the vehicle’s battery, you must perform a security relearn procedure. This is a simple process that pairs the new PCM to your car’s anti-theft system and keys. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. Specific instructions for your vehicle are easy to find online.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or a code that points to an internal module failure (like P0601), this part is the correct solution. However, if the light is on due to a failing sensor (like an oxygen sensor or a knock sensor), you will still need to replace that specific sensor. This PCM will only resolve issues directly related to the computer itself.
Where do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your VIN. We cannot ship your part until we receive the VIN, as the programming is a critical part of the order process. Please have it ready to ensure the fastest possible shipping.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is very manageable. It involves disconnecting the battery, unplugging a few electrical harnesses, and removing a few bolts. The most important part is the security relearn procedure after installation. No specialized tools are required for the physical installation.