Is Your Chevy HHR Running Erratically? Restore Its Performance.
If you’re dealing with a frustrating check engine light, poor fuel mileage, stalling, or a no-start condition in your 2007-2011 HHR, a failing Powertrain Control Module (PCM) is often the culprit. As the ‘brain’ of your vehicle, when the PCM goes bad, it can cause a host of confusing and intermittent issues. This isn’t just an inconvenience; it affects your vehicle’s reliability and safety. This replacement PCM, part number 12597125, is the definitive solution to get your HHR back on the road, running like it should.
The Smart Solution: Pre-Programmed for Your Exact Vehicle
Forget expensive dealership visits and towing fees. We take the hassle out of the repair by programming this module specifically for your vehicle using your VIN. We load the latest, most stable GM-certified software, ensuring optimal engine performance, fuel efficiency, and transmission shifting. When it arrives, it’s ready for a straightforward installation. This is the most efficient way to replace a faulty 2007-2011 HHR PCM.
A Real-World Scenario from My Shop
A customer brought in their 2009 HHR with a complaint that stumped two other shops: it would randomly refuse to start, but only when warm. There were no consistent trouble codes, just a flashing security light. After verifying power and ground to the module, we suspected an internal PCM failure. The heat was causing a solder joint on the main board to fail, cutting communication. We installed a pre-programmed PCM just like this one, and the problem was solved instantly. The customer saved hundreds compared to the dealership quote and drove away with a reliable car that same day.
Common Symptoms of a Failing GM PCM:
- ✔ Check Engine Light (CEL) is on with communication-related codes (U-codes) or multiple random codes.
- ✔ Engine cranks but will not start.
- ✔ Stalling, hesitation, or rough idling for no apparent reason.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inaccurate or non-functioning dashboard gauges.
Plug-and-Play Installation: No Dealer Visit Required
Replacing your 2007-2011 HHR PCM is a job most DIYers can handle. For the HHR, the module is conveniently located in the engine compartment. Follow these simple steps for a successful swap:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the HHR, you’ll find it on the left-hand (driver’s side) rear of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out. Never force them. Inspect the connectors for any corrosion and clean them with contact cleaner if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into place.
- Reconnect Everything: Firmly plug in the electrical connectors until they click, and then reconnect your negative battery terminal.
- Perform Security Relearn: You may need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions will be included.
Guaranteed Compatibility Across a Wide Range of GM Vehicles
This module, service number 12597125, is a direct replacement for a variety of GM cars, trucks, and vans. It replaces the following part numbers: 12612397, DL 216140, 12594750, 12629019, 12635902, and 12611549. Please use the fitment chart to confirm this is the correct part for your specific make, model, and engine option.
Frequently Asked Questions about the 2007-2011 HHR PCM
Q: How do I provide my VIN for programming?
A: After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information to program it correctly.
Q: Is any additional programming required after installation?
A: No. This PCM comes fully programmed with the latest GM software matched to your VIN. In some cases, a simple ‘security relearn’ or ‘CASE relearn’ may be needed, which can be done without special tools and we provide instructions for.
Q: How can I be sure my old PCM is the problem?
A: While the symptoms listed above are strong indicators, it’s always best to have the vehicle properly diagnosed. Key signs are communication error codes (like U0100), multiple unrelated sensor codes appearing at once, or having already ruled out wiring and sensor issues.
Q: Will this fix my car’s specific issue?
A: This module will resolve any issues directly caused by a faulty PCM. It corrects problems with engine management, fuel delivery calculations, and transmission control signals originating from a defective computer.
Q: Where is the PCM located on my 2008 Chevy HHR?
A: For the 2007-2011 HHR, the Electronic Control Module (PCM/ECM) is located in the engine compartment, on the driver’s side, towards the firewall.