Is Your Chevy HHR Running Rough?
If your 2007-2011 Chevrolet HHR is experiencing frustrating issues like a persistent check engine light, poor fuel economy, stalling, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your vehicle’s engine, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, the symptoms can be unpredictable and difficult to diagnose. Don’t let a faulty computer keep you off the road. This is your direct, reliable solution.
This listing is for a replacement Powertrain Control Module, compatible with part numbers including 12597125 and 12618031, that arrives at your doorstep fully programmed for your specific vehicle. We take the guesswork and the expensive dealership visits out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest GM-certified software and calibrations. This ensures a seamless installation and restores your vehicle’s original performance and efficiency.
From the Diagnostic Bay
We had a 2009 HHR come in with the strangest problem. The owner said it would randomly lose power on the highway, with the gauges sweeping and then returning to normal, but no check engine light would stay on. We checked the battery, alternator, and all the main grounds—everything looked perfect. After hours of chasing wires, we decided to monitor the PCM’s internal voltage and temperature data on a long test drive. Sure enough, we saw the internal processor voltage drop erratically right before the power loss events. A failing component inside the module was causing it to reset. We installed one of our pre-programmed PCMs, performed the quick security relearn, and the HHR ran flawlessly. It’s a classic example of how a failing PCM can cause bizarre, hard-to-trace symptoms.
Symptoms of a Failing 2007-2011 HHR PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Drastic decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or intermittent starting issues.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Unexplained warning lights on the instrument cluster.
The Plug-and-Play Advantage
Why spend hundreds of dollars at a dealership for programming and labor? Our process is designed for the DIY mechanic and professional alike. Because we program the module using your VIN, the unit integrates perfectly with your HHR’s existing systems, including the engine, transmission, and anti-theft security. In most cases, the only additional step required is a simple security relearn procedure, which you can perform yourself in your driveway in about 15 minutes with just the key. We provide clear instructions to make the process straightforward.
This module is a direct replacement for a wide range of GM vehicles and is compatible with numerous service numbers, including 12612397, 12594750, 12597125, 12629019, 12635902, and 12611549. While it fits models like the Cobalt, Malibu, G6, and Silverado, this specific programming is tailored for the 2007-2011 HHR PCM to ensure perfect operation.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle all the programming for you before the part is shipped. It arrives ready to be installed in your vehicle. All we need is your vehicle’s 17-digit VIN to ensure a perfect match.
What is a security relearn, and is it difficult?
A security relearn (also known as an anti-theft relearn) syncs the new PCM to your car’s ignition keys and security system. It’s a simple procedure that usually involves turning the key to the ‘ON’ position for 10 minutes, then off, and repeating two more times. We include easy-to-follow instructions for this process.
Where is the PCM located on my Chevy HHR?
On the 2007-2011 Chevrolet HHR, the Electronic Control Module (ECM/PCM) is typically located in the left-hand (driver’s side) rear of the engine compartment, near the firewall.
Will this fix my car’s problem for sure?
This replacement PCM will correct any issues directly caused by a faulty computer. However, it’s essential that your vehicle has been properly diagnosed. Problems like bad sensors, faulty wiring, or mechanical failures can mimic PCM symptoms. We recommend a professional diagnosis to confirm the PCM is the point of failure.
How do I find my original part number to verify compatibility?
Your original part number is printed on a white or silver sticker on the casing of your existing module. Verifying this number against our compatible list (e.g., 12597125, 12618031) is the best way to ensure you’re ordering the correct part.