Restore Peak Performance to Your Chevrolet HHR
Is your 2007-2011 Chevrolet HHR running rough, stalling, or displaying a persistent check engine light? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing your vehicle’s engine, transmission, and emissions systems. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose problems. This genuine GM control module, part number 12638026, is the definitive solution to restore your vehicle’s reliability, efficiency, and drivability.
We take the guesswork out of the repair process. Unlike a generic module from a parts store or a salvage yard, this unit comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and calibrations for your HHR’s exact engine, transmission, and options package. We flash it with the latest updates available from General Motors, which often include improvements to fuel economy, performance, and emissions that were not available when your vehicle was new. This means you’re not just replacing a part; you’re getting a component with the most current operational software.
Is Your Chevy HHR Experiencing These Issues?
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns with various codes.
- ✔ Rough or erratic idling that makes the car shake at a stop.
- ✔ A sudden and unexplained drop in fuel economy.
- ✔ Engine hesitation, stumbling, or stalling during acceleration.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Failing a state emissions or smog test.
- ✔ Unpredictable or harsh automatic transmission shifting.
- ✔ Communication error codes (U-codes) stored in the system.
From the Diagnostic Bay
We had a 2009 HHR come into the shop that was a real head-scratcher. The owner had replaced the spark plugs, ignition coils, and even the mass airflow sensor, but it still had a rough idle and would occasionally stall at red lights. The check engine light would come on with random misfire codes that would change cylinders. After hours of chasing down wiring diagrams and testing sensors, we hooked up our high-level scanner and monitored the live data from the PCM. We noticed the fuel trim and ignition timing commands were fluctuating wildly for no reason. We connected a known-good PCM, and the engine immediately smoothed out. The original 2007-2011 HHR PCM had an internal fault that was causing it to send incorrect signals. It’s a classic case of how a failing computer can make you think you have a dozen other problems.
The Importance of a VIN-Programmed 2007-2011 HHR PCM
Your vehicle’s PCM is not a one-size-fits-all component. It’s tailored to manage the unique parameters of your car. By providing us with your VIN during checkout, you ensure that the module you receive is a true plug-and-play solution. This eliminates the need for expensive trips to the dealership for programming. Once installed, you may need to perform a simple security relearn procedure, which can typically be done in your own driveway in about 30 minutes with just your key. This procedure syncs the new PCM with your vehicle’s anti-theft system.
This module is a direct replacement for several service numbers, including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. Its wide compatibility across numerous GM models like the Cobalt, Malibu, G6, and Silverado speaks to its robust engineering. By choosing this part, you are getting a reliable, tested component that meets or exceeds original factory specifications.
Installation is Straightforward
Replacing the PCM on your HHR is a manageable task for a DIY mechanic. The module is located in the engine compartment on the driver’s side, near the rear. Always disconnect the battery before beginning work. Carefully unplug the electrical connectors, unbolt the old module, and install the new one in its place. Reconnect the connectors and the battery, then perform the security relearn procedure if necessary. With our pre-programmed module, you’ll be back on the road in no time, enjoying a smoother, more responsive, and more reliable vehicle.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine performance, including fuel injection, ignition timing, emissions systems, and automatic transmission shifting, to ensure optimal efficiency and power.
Does this PCM come programmed?
Yes, absolutely. We require your vehicle’s VIN at checkout to program this module with the latest GM software specific to your car. This makes installation much simpler and avoids a costly trip to the dealer.
Where is the PCM located on my 2007-2011 HHR?
On the Chevrolet HHR, the PCM is typically located in the engine compartment, on the driver’s side, towards the firewall. It is a silver metal box with several large electrical connectors.
Will I need to do anything else after installing this part?
In most cases, you will need to perform a security relearn procedure (also known as an anti-theft relearn). This process syncs the new PCM to your car’s keys and security system. It is a simple procedure that can be done at home and does not require special tools.
Is this compatible with other GM vehicles?
Yes, this specific PCM hardware is used in a wide variety of GM vehicles from this era, including the Cobalt, Malibu, G6, Silverado, and more. However, the programming is unique to each model. The unit you receive will be programmed specifically for your HHR based on the VIN you provide.