Is Your 2006 HHR Experiencing Frustrating Engine Problems?
A faulty Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the electronic brain of your 2006 Chevrolet HHR. When it begins to fail, it can cause a cascade of confusing and intermittent issues that can be difficult to diagnose. From a sudden refusal to start to erratic idling and poor fuel economy, a failing PCM can make your reliable HHR feel unpredictable. This isn’t just an inconvenience; it can affect your vehicle’s performance, emissions, and overall safety. You need a solution that is reliable, straightforward, and gets you back on the road without the exorbitant costs and programming headaches of a dealership visit.
From the Diagnostic Bay
We once had a 2006 HHR towed in that had its owner completely stumped. The car would randomly stall at stoplights and occasionally wouldn’t start at all, but there were no consistent trouble codes—just a random collection of communication errors that would come and go. The owner had already replaced the crankshaft position sensor and the ignition module based on forum advice, with no success. After hooking up our professional scan tool and monitoring live data, we noticed the 5-volt reference signal to several key sensors was fluctuating wildly. This is a classic, yet often overlooked, symptom of an internal PCM failure. A simple replacement with a pre-programmed unit like this one had the car running perfectly in under an hour. It’s a reminder that sometimes the root cause lies within the central computer itself, not just the sensors it communicates with.
Common Symptoms of a Failing 2006 HHR PCM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine cranks but refuses to start, or starts and immediately stalls.
- ✔ Noticeable decrease in fuel efficiency for no apparent reason.
- ✔ Rough or erratic idling, surging, or stumbling during acceleration.
- ✔ Automatic transmission shifts harshly, at the wrong times, or not at all.
- ✔ Communication errors with diagnostic scan tools (e.g., U-codes).
- ✔ The vehicle’s anti-theft or security light may illuminate, preventing startup.
Why Our Pre-Programmed 2006 HHR PCM is the Ideal Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and complexity out of the process. When you order this Powertrain Control Module, service number 12599714, we use the Vehicle Identification Number (VIN) you provide to flash the unit with the latest, most stable software updates directly from GM. This critical step ensures that the module is perfectly matched to your vehicle’s specific configuration, including its engine, transmission, and factory options. This VIN-specific programming is essential for proper function and avoids the compatibility issues that plague unprogrammed modules.
This module is a direct-fit replacement for several original equipment service numbers, ensuring broad compatibility. It directly replaces:
- 12599714
- 12589998
- 12597329
- 12600882
- 12600883
- 12605766
- 12605765
This part is verified to fit the following vehicles:
- 2006 Chevrolet HHR (2.2L Engine)
- 2006 Chevrolet Cobalt (2.2L Engine, VIN F)
- 2005 Chevrolet Cobalt (ID 12589998)
- 2006 Pontiac Pursuit (2.2L Engine)
- 2005 Pontiac Pursuit (ID 12589998)
Upon installation, the only additional step typically required is a security relearn procedure, also known as a Passlock or anti-theft relearn. This is a simple process that syncs the new PCM with your vehicle’s existing keys and can usually be performed in your own driveway without any special tools. We include straightforward instructions to guide you through this final step, making the entire replacement process as seamless as possible.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. We program the module to your vehicle’s VIN before it ships. The only thing you may need to do is a simple security relearn procedure, which does not require a scan tool. We provide instructions for this process.
Where do I provide my vehicle’s VIN?
After placing your order, you can send us your 17-digit VIN through the messaging system or include it in the notes section during checkout. We cannot ship the part until we receive your VIN, as the programming is essential.
Is this a plug-and-play part?
It is as close to plug-and-play as possible. Once programmed to your VIN, you simply disconnect the battery, swap the old module with the new one, reconnect the battery, and perform the security relearn. This ensures all vehicle systems communicate correctly with the new brain.
How can I be sure this will fix my car’s problem?
While this PCM resolves the common symptoms listed, we always recommend a proper diagnosis by a qualified mechanic. A faulty PCM can mimic other issues, such as a bad sensor or wiring problem. Verifying the PCM is the point of failure before ordering will ensure this part solves your issue.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM (Engine Control Module) typically controls only engine functions. A PCM (Powertrain Control Module) controls both the engine and the transmission. For your 2006 HHR, this unit functions as the PCM, managing all powertrain operations.