Is Your Chevrolet HHR or Cobalt Experiencing Frustrating Engine Problems?
If you’re dealing with a check engine light that won’t go away, unexplained stalling, rough idling, or a complete no-start condition, the root cause is often a failing Engine Control Module (ECM), also known as the Powertrain Control Module (PCM). This component is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can create a cascade of confusing and difficult-to-diagnose symptoms, leaving you stranded and facing costly repair bills.
This is a direct-fit replacement ECM, part number 12605766, for your 2006 Chevrolet HHR, 2005-2006 Cobalt, or Pontiac Pursuit. Unlike a used part from a salvage yard that won’t work without expensive dealership programming, this module comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest, most stable software updates from General Motors, which can resolve underlying factory issues and improve overall vehicle operation. This ensures a seamless installation process and gets you back on the road quickly and reliably.
From the Diagnostic Bay
We had a 2006 Chevy Cobalt come into the shop with a very erratic issue. The owner complained of intermittent stalling at stoplights and a persistent P0601 ‘Internal Control Module Memory Check Sum Error’ code. They had already replaced the throttle body and a crank sensor based on other shops’ advice, with no success. After hooking up our diagnostic tools, we noticed the live data stream would occasionally freeze and drop out. This pointed directly to the processor inside the ECM failing. We installed one of our VIN-programmed modules, performed the security relearn, and the car ran perfectly. The P0601 code was gone for good, and the stalling issue was completely resolved. It saved the customer from chasing phantom sensor problems and got their car running right.
Solving Your Vehicle’s Core Electrical Issues
A failing 2006 HHR Engine Control Module can manifest in numerous ways, often mimicking the failure of other components. By replacing the faulty computer, you are addressing the source of the problem, not just the symptoms. This module is the definitive solution for restoring your vehicle’s original performance, reliability, and fuel efficiency. We handle the complex programming, so all you need to do is provide your VIN during checkout. The part arrives ready for installation, simplifying the repair process significantly.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various trouble codes (including U-codes for communication loss or P0601-P0606 internal module codes).
- ✔ Engine stalls intermittently or refuses to start at all.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or unstable engine idle.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle enters a reduced power or ‘limp’ mode.
- ✔ Issues with anti-theft system engagement, preventing the car from starting.
Why Choose a Pre-Programmed 2006 HHR Engine Control Module?
The main benefit of our service is convenience and reliability. Dealerships can charge hundreds for programming alone, and many independent shops lack the specific equipment to program this GM module correctly. We eliminate that step entirely. By programming the unit with the latest GM calibrations tied to your VIN, we ensure it communicates perfectly with all other modules in your vehicle—like the BCM and TCM—right out of the box. This unit is a reliable and cost-effective alternative to a dealership repair, designed to restore your vehicle’s factory functionality. This module is compatible with a range of service numbers, including 12599714, 12589998, 12597329, 12600882, 12600883, 12605766, and 12605765.
Frequently Asked Questions
Do I need to have this module programmed?
No. This Engine Control Module comes fully pre-programmed to your vehicle’s VIN. Simply provide us with your 17-digit VIN when you place your order, and we will flash the unit with the correct, updated GM software before shipping.
Will I need to do anything after I install it?
Yes. After installation, you will need to perform a security relearn procedure, often called a ‘CASE Relearn’ or ‘Crankshaft Variation Relearn’. This is a simple process that can typically be done without special tools and involves a sequence of key turns. Instructions are widely available online for your specific model, or your mechanic can perform it in a few minutes.
How do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield. It is also located on the driver’s side door jamb sticker.
Is this compatible with my 2.2L engine?
Yes, this module is specified for the 2.2L engine in the 2006 HHR, 2006 Pursuit, and 2005-2006 Cobalt models as detailed in the fitment guide. Please verify your vehicle’s options match the description to ensure compatibility.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM (Engine Control Module) traditionally controlled only engine functions. PCM (Powertrain Control Module) is a more modern term for a module that controls both the engine and the transmission. For this vehicle, the unit serves as the PCM, but it is commonly referred to as the ECM.