Is Your Chevrolet HHR Running Rough?
If your 2007-2011 Chevrolet HHR is experiencing frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition, the root cause is often a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can sideline your vehicle indefinitely.
Don’t let a faulty computer keep you off the road. This is a direct replacement PCM, service number 12635902, that restores your vehicle’s original performance and reliability. We take the guesswork and hassle out of the repair by pre-programming the module specifically for your vehicle using your VIN. This means it arrives with the latest GM software updates already installed, ready for a straightforward installation.
From the Diagnostic Bay
We had a 2009 HHR come into the shop with a laundry list of complaints: stalling at idle, harsh shifting, and a check engine light for a random misfire that previous shops couldn’t solve. They had already replaced plugs, coils, and even a fuel injector. After hooking up our diagnostic scanner, we noticed the live data for the ignition coil driver was fluctuating wildly. Instead of chasing more parts, we tested the circuits directly at the PCM and found the driver inside the module itself was failing intermittently. A new, correctly programmed PCM solved all the issues in one go. It’s a classic case of symptoms pointing everywhere, but the real problem lying with the vehicle’s central computer.
Symptoms of a Failing 2007-2011 HHR PCM
A failing PCM can manifest in various ways. If you’re noticing any of the following symptoms, it’s a strong indicator that your engine computer needs attention. This module is the solution for restoring proper function and clearing these persistent issues.
- ✔ Check Engine Light is on with various trouble codes (DTCs)
- ✔ Vehicle refuses to start or has difficulty starting
- ✔ Poor engine performance, including stuttering or hesitation
- ✔ Reduced fuel efficiency for no apparent reason
- ✔ Automatic transmission shifting erratically or harshly
- ✔ Communication errors with diagnostic scan tools
- ✔ Stalling or cutting out while driving
The Simple, Reliable Solution
Replacing your vehicle’s PCM can seem daunting, often involving expensive trips to the dealership for programming. We eliminate that step. By providing us with your vehicle’s VIN during checkout, you receive a module that is flashed with the correct software for your HHR’s specific configuration. This ensures all components communicate correctly and your engine operates according to factory specifications.
This PCM is a direct fit for a wide range of General Motors vehicles beyond the HHR, including models like the Chevrolet Cobalt, Malibu, Silverado 1500, Pontiac G6, Saturn Aura, and more. It is compatible with multiple service numbers, including 12597125, 12612397, and 12629019, making it a versatile and reliable choice for your repair needs.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and the module will arrive with the latest GM software updates specific to your car, ready for installation.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM stands for Powertrain Control Module, and ECM stands for Engine Control Module. In most modern vehicles like your HHR, the PCM is a single unit that controls both the engine and the transmission functions.
Where is the PCM located on a 2007-2011 Chevy HHR?
On the Chevrolet HHR, the PCM is typically located in the engine compartment, on the driver’s side, near the rear of the engine bay. It’s a silver metal box with several large electrical connectors. Always disconnect the battery before attempting to remove or install the module.
Will I need to perform any other procedures after installation?
In many cases, after installation, you will need to perform a security relearn procedure, also known as a Passlock or anti-theft relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and keys. It’s a simple process that typically takes 10-30 minutes and does not require any special tools. Instructions are widely available online or in your vehicle’s service manual.
Is this part compatible with other GM vehicles?
Yes. While this is a primary fit for the HHR, this specific PCM hardware was used across a wide variety of GM cars and trucks from this era, including the Cobalt, Malibu, G5, G6, Silverado, and Sierra with specific engines. Please verify the part number or consult our fitment list to ensure it’s correct for your vehicle.