Restore Peak Performance to Your Chevrolet HHR
Is your 2007-2011 Chevrolet HHR suffering from baffling engine issues, a persistent check engine light, or a no-start condition? The Powertrain Control Module (PCM), the central computer of your vehicle’s engine and transmission, is often the culprit. This replacement PCM, service number 12597125, is the definitive solution to restore your vehicle’s factory performance, drivability, and fuel efficiency. We take the guesswork out of the repair by programming the module specifically to your vehicle’s VIN before it ships, ensuring a seamless integration process.
From the Diagnostic Bay
We once had a 2009 HHR come into the shop with a persistent, random misfire that the owner had spent hundreds trying to fix. He had replaced the spark plugs, ignition coils, and even the fuel injectors. The misfire would disappear for a day and then return with a vengeance. After connecting our diagnostic scanner, we noticed the injector pulse width for cylinder 3 was erratic. It wasn’t a bad injector; the command from the PCM itself was faulty. We installed a VIN-programmed PCM, performed a quick crankshaft variation relearn, and the HHR ran like it just rolled off the assembly line. It’s a classic case of symptoms pointing to one thing, while the root cause lies within the vehicle’s brain.
Common Symptoms of a Failing HHR PCM
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, a faulty PCM could be the root cause:
- ✔ Persistent Check Engine Light (CEL) with communication-related codes (e.g., U-series codes) or performance codes that don’t resolve after replacing indicated parts.
- ✔ Unexplained drops in fuel economy.
- ✔ Engine stalling, stumbling, or running rough at idle.
- ✔ Intermittent starting problems or a complete no-start condition where the engine cranks but won’t fire.
- ✔ Harsh or erratic shifting from the automatic transmission.
- ✔ Failure to pass state emissions tests due to module-related errors.
The Right Solution: A Programmed 2007-2011 HHR PCM
Unlike a generic part from a local auto parts store, this module is not a one-size-fits-all solution. It is a dedicated component that requires precise software to function correctly with your HHR’s specific systems. Our process is simple and effective: upon purchase, you provide us with your vehicle’s VIN. We then flash the module with the latest, most stable GM-certified software calibration for your exact vehicle. This critical step ensures that the PCM communicates flawlessly with the Body Control Module (BCM), Transmission Control Module (TCM), and anti-theft system, eliminating the need for an expensive trip to the dealership for programming.
Installation and Post-Install Procedures
Physical installation is typically straightforward. On the HHR, the PCM is located in the left rear of the engine compartment. Always disconnect the negative battery terminal before beginning. Once the new module is installed and the battery is reconnected, you may need to perform a simple security relearn procedure, often called a “key-on/key-off” cycle. This allows the PCM to synchronize with your vehicle’s anti-theft system. In some cases, a Crankshaft Position System Variation Learning (CASE) relearn may be needed, which can be done with a capable bi-directional scan tool.
Guaranteed Compatibility
This PCM is a direct replacement for a wide range of GM vehicles and is compatible with multiple service numbers, ensuring a perfect fit for your application. It directly replaces the following part numbers: 12612397, DL 216140, 12594750, 12597125, 12629019, 12635902, and 12611549. Ordering a pre-programmed 2007-2011 HHR PCM from us is the most reliable and cost-effective way to get your vehicle back on the road.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. This means it arrives ready for installation, saving you the time and expense of a dealership visit.
What information do you need from me?
After you place your order, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle. This is typically found on the driver’s side dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Is this part truly plug-and-play?
For most vehicles, yes. After installation, you may need to perform a simple security relearn procedure which involves a few key cycles. We provide instructions for this common procedure. Some vehicles may also require a CASE relearn with a scan tool.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, this part is the correct solution. It’s crucial to have your vehicle properly diagnosed to ensure the PCM is the source of the problem and not another sensor or component.
Where is the PCM located on my HHR?
On the 2007-2011 Chevrolet HHR, the Electronic Control Module (PCM/ECM) is typically located in the left-hand (driver’s side) rear area of the engine compartment.