Is your 2005-2006 Chevrolet Cobalt, Pontiac Pursuit, or 2006 HHR suffering from perplexing engine problems? Issues like a persistent Check Engine Light, erratic stalling, poor fuel economy, or a complete no-start condition often point to a single culprit: a failing Powertrain Control Module (PCM). As the central brain of your vehicle’s engine management system, the PCM is responsible for calculating and controlling everything from fuel injection and ignition timing to transmission shifting and emissions. When it fails, the entire vehicle’s performance and reliability are compromised.
This is a direct-fit replacement Engine Control Module (ECM/PCM) for vehicles originally equipped with part number 12589998. We take the guesswork and hassle out of the repair process. Each module is professionally programmed with the latest GM-certified software updates specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures that your new PCM communicates flawlessly with all other modules in your car, restoring its original performance, drivability, and fuel efficiency. Forget expensive trips to the dealership for programming; this unit arrives at your door ready for a straightforward installation.
We had a 2006 Chevy HHR come into the shop with a classic case of “ghost in the machine.” The owner reported intermittent stalling at red lights and a check engine light that would come and go. We scanned the codes and found a P0601 (Internal Control Module Memory Check Sum Error). After verifying the power and ground circuits to the PCM were solid, we knew the internal processor was failing. Swapping in a pre-programmed module like this one had the HHR running perfectly in under an hour, saving the customer hundreds compared to a dealership visit. These symptoms are incredibly common for a failing 2005-2006 Cobalt PCM and its counterparts.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication-related or internal processor fault codes.
- ✔ Unexplained stalling or engine hesitation, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfires or rough idling.
- ✔ The vehicle cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
Why Choose Our Pre-Programmed 2005-2006 Cobalt PCM?
This isn’t just a replacement part; it’s a complete solution. By programming the module to your specific VIN, we ensure that all factory settings, including security information (immobilizer) and specific engine parameters, are correctly loaded. This unit is fully compatible with a range of service numbers, including 12599714, 12589998, 12597329, 12600882, 12600883, 12605766, and 12605765. Our process guarantees a seamless integration with your vehicle, restoring it to factory specifications. After installation, you may need to perform a simple security relearn procedure, which can often be done without special tools and instructions can easily be found online.
Vehicle Fitment:
This module is a confirmed fit for the following vehicles with the specified options:
- 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, 8th digit)
- 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
Restore the reliability and performance of your vehicle with a properly functioning, VIN-programmed engine computer. Eliminate the frustrating diagnostic chase and get back on the road with confidence.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or requirement to send your old module to us. This is an outright purchase, allowing you to get your vehicle repaired faster.
What information do you need from me?
After you place your order, you MUST provide us with your vehicle’s 17-digit VIN. We cannot ship your part until we have this information, as the programming is specific to your car.
Is this part difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. However, after installation, a security relearn procedure (sometimes called a CASE relearn) is often required for the vehicle to start. This procedure syncs the new PCM with your vehicle’s anti-theft system.
Will this fix my car’s problem for sure?
This module will correct issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, it is crucial to have the vehicle properly diagnosed by a qualified mechanic to rule out other potential causes, such as wiring or sensor issues.
What does ‘programmed with the newest updates’ mean?
General Motors often releases software updates for their vehicles to improve performance, fuel economy, or fix minor bugs. When we program your module, we use the latest software version available from GM for your specific VIN, ensuring your vehicle runs as well or better than it did when it left the factory.