Is Your 2007 HHR Running Rough? The ECM Might Be the Culprit.
The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the central computer of your 2007 Chevrolet HHR. It’s responsible for managing everything from fuel mixture and ignition timing to transmission shift points and emissions control. When this critical component begins to fail, it can cause a wide array of confusing and frustrating symptoms that can be difficult to diagnose. From a persistent Check Engine Light to intermittent stalling or a complete no-start condition, a faulty ECM can bring your vehicle to a standstill.
From the Diagnostic Bay
We had a 2007 HHR with the 2.4L engine come into the shop that was a real head-scratcher. The owner complained of random stalling at traffic lights and a noticeable lack of power when accelerating. The check engine light was on with a generic communication error code (U0100). Mechanics at two other shops had already replaced the throttle body and a camshaft position sensor with no success. After verifying the wiring harness integrity, we suspected the ECM. We swapped in one of our pre-programmed modules, and the car immediately fired up and ran perfectly. It’s a classic case where the core problem wasn’t a sensor, but the computer interpreting the sensor data.
Your Plug-and-Play Solution: A Programmed 2007 HHR ECM
Don’t let a faulty engine computer keep you off the road. This genuine used GM ECM, part number 19210736 (interchangeable with 12605843), is the reliable and cost-effective solution you need. We take the guesswork and hassle out of the repair process. Before we ship the unit, our technicians will program it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that all factory settings, security information (anti-theft), and engine parameters are perfectly matched to your HHR. The result is a true plug-and-play installation with no need for an expensive trip to the dealership for additional programming.
Common Symptoms of a Failing 2007 HHR ECM
- ✔ Check Engine Light: The light may be on constantly or intermittently, often with communication-related trouble codes.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- ✔ Stalling or Rough Idle: Your HHR may stall unexpectedly while driving or at a stop, or it may idle erratically.
- ✔ No-Start Condition: The engine may crank but refuse to start, even with a good battery and starter.
- ✔ Erratic Transmission Shifting: The ECM also communicates with the transmission controller, and a failure can cause harsh or incorrect gear changes.
- ✔ Communication Issues: Your OBD-II scan tool may be unable to communicate with the vehicle’s computer.
This module is a tested, functional unit sourced from a salvaged vehicle. By providing us with your VIN upon purchase, you guarantee that the module you receive will have the latest GM software updates and will be ready for immediate installation. Restore your vehicle’s performance and reliability today.
Broad Compatibility: While this is a perfect fit for the 2007 HHR, part number 19210736 is also the correct ECM for a wide range of other 2007 GM vehicles, including the Pontiac Solstice, Saturn Sky, Cadillac DTS, Chevy Impala, and many more. Please verify the part number and consult the fitment list to ensure compatibility with your specific model and engine option.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. This is the primary benefit of our service. We program the module to your vehicle’s specific VIN before shipping it to you. This makes the installation plug-and-play, saving you time and the high cost of dealership programming.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. 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 a new part?
No, this is a genuine, used OEM part that has been carefully removed from a salvaged vehicle. Each unit is inspected to ensure it is a functional and reliable replacement for your original module.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM controls both the engine and the automatic transmission, which is the case for most modern vehicles like your 2007 HHR. This part serves as the PCM.
Will this part require a security or CASE relearn procedure?
Because we pre-program the unit to your VIN, in most cases, no additional procedures are required. However, some GM vehicles may require a simple security relearn procedure that can be done without special tools. Instructions can be easily found online or in your vehicle’s service manual.