Is Your Chevy Cobalt or HHR Running Rough?
If you’re experiencing frustrating issues like stalling, poor fuel economy, a no-start condition, or a persistent Check Engine Light, the root cause might be a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it starts to fail, it can cause a wide range of confusing and unpredictable symptoms that can be difficult to diagnose. Don’t let a faulty computer keep your car off the road. This is a direct-fit, VIN-programmed replacement PCM, part number 12599714, designed to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We had a 2006 Chevy HHR come into the shop that was driving the owner crazy. It would randomly stall at traffic lights and occasionally refuse to start, but there were no consistent trouble codes—just a generic P0601 (Internal Control Module Memory Check Sum Error) that would pop up intermittently. The owner had already replaced the battery, alternator, and crankshaft position sensor with no luck. After hooking up our scanner and monitoring live data, we noticed erratic voltage readings coming from the PCM’s internal processor. We swapped in a VIN-programmed module, performed the security relearn, and the HHR ran perfectly. It’s a classic case where shotgunning parts costs more time and money than correctly identifying the faulty computer from the start.
Symptoms of a Failing 2005-2006 Cobalt PCM
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or shutting off while driving
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel efficiency
- ✔ Rough idling or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ False sensor readings or multiple, unrelated trouble codes
The Simple, Reliable Solution
This isn’t just a replacement part; it’s a complete solution. We take the guesswork out of the repair process. When you order this 2005-2006 Cobalt PCM, you provide us with your vehicle’s Vehicle Identification Number (VIN). Our technicians then use that VIN to flash the module with the latest, most up-to-date software directly from GM. This ensures that the computer is perfectly matched to your car’s specific configuration, including its engine, transmission, and factory options. The result is a plug-and-play installation that restores factory performance and drivability.
Key Features & Benefits:
- VIN-Programmed: Arrives ready for installation, flashed with the latest GM software for your specific vehicle.
- Direct Fit: Designed to replace original part number 12599714 and other compatible service numbers without any modification.
- Cost-Effective: A smart alternative to the high costs of a new module from a dealership, which often involves extra charges for programming and labor.
- Quality Tested: Each module undergoes rigorous testing to ensure functionality and reliability.
Compatibility Information
This module is a direct replacement for service numbers: 12599714, 12589998, 12597329, 12600882, 12600883, 12605766, and 12605765.
It is confirmed to fit the following vehicles:
- 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)
- 2006 Chevrolet HHR: Electronic Control Module; (LH rear engine compartment), 2.2L
- 2005 Pontiac Pursuit: Electronic Control Module; (LH front engine compartment), ID 12589998
- 2006 Pontiac Pursuit: Electronic Control Module; (LH front engine compartment), 2.2L
Important Note: After installation, you may need to perform a simple security relearn procedure (often called a Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions are widely available online.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your original module to us. This is an outright purchase.
What is VIN programming?
VIN programming is the process of loading your vehicle’s specific software and calibration files onto the PCM. This ensures the module works correctly with your engine, transmission, and options package. We handle this for you before shipping.
Will this fix my specific problem?
This module will correct issues directly caused by a faulty PCM. While the symptoms listed are common indicators of PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the source of the problem before purchasing.
Is any additional programming needed after installation?
No additional programming is required. However, you will likely need to perform a security relearn procedure, which syncs the new PCM to your car’s anti-theft system. This is a simple procedure that typically takes about 30 minutes and does not require a scan tool.
Where is the PCM located on my vehicle?
On the 2005-2006 Cobalt and Pursuit, the PCM is located in the left-hand (driver’s side) front of the engine compartment. On the 2006 HHR, it is found in the left-hand rear of the engine compartment.