Is Your Chevy Cobalt or HHR Running Rough?
If you’re experiencing frustrating issues like a persistent check engine light, poor fuel economy, engine stalling, or a complete no-start condition, the root cause is often a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it fails, the symptoms can be unpredictable and difficult to diagnose. This replacement ECM, part number 12600882, is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We had a 2006 Chevy HHR come into the shop that was driving the owner crazy. It would randomly stall at stoplights and occasionally refuse to start, but there were no consistent trouble codes—just a generic U-code every now and then. The owner had already replaced the battery, alternator, and crankshaft position sensor with no luck. After connecting our scope, we noticed an erratic signal from the ECM’s 5-volt reference line. A quick swap with a known-good, programmed module confirmed our suspicion: the original ECM was failing internally. This pre-programmed 2005-2006 Cobalt ECM saved the customer from further guesswork and unnecessary parts expenses, getting their HHR back on the road reliably.
Direct-Fit Solution for Your Vehicle
This isn’t just a generic part. We provide a fully programmed module specific to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and calibrations for your engine, transmission, and factory options. By programming the unit with the latest GM updates before it ships, we eliminate the need for an expensive trip to the dealership. It arrives at your door ready for a straightforward installation.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Unexplained drop in fuel mileage
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Intermittent or complete no-start condition
- ✔ Communication errors with diagnostic scan tools
- ✔ Performance issues like hesitation or lack of power
Why Choose Our Programmed 2005-2006 Cobalt ECM?
Getting your vehicle back to factory-spec performance is our priority. This module is a direct replacement for a range of original equipment service numbers, including 12599714, 12589998, 12597329, 12600882, 12600883, 12605766, and 12605765. Our process is simple: you provide your VIN during or after checkout, our technicians flash the module with the precise GM software for your car, and we ship you a component that is ready to be installed. In most cases, the security relearn procedure (often called a CASE relearn) is a simple process you can perform at home without special tools. We provide clear instructions to guide you through it.
Complete Vehicle Fitment Information
This Electronic Control Module is guaranteed to fit the following vehicles:
- 2005 Chevrolet Cobalt: Electronic Control Module; (LH front engine compartment), ID 12589998
- 2006 Chevrolet Cobalt: Electronic Control Module; (LH front engine compartment), 2.2L (VIN F, 8th digit, 4-134)
- 2006 Chevrolet HHR: Electronic Control Module; (LH rear engine compartment), 2.2L
- 2005 Pontiac Pursuit: Electronic Control Module; (LH front engine compartment), ID 12589998
- 2006 Pontiac Pursuit: Electronic Control Module; (LH front engine compartment), 2.2L
Don’t continue to struggle with a poorly running vehicle. Replacing your faulty ECM is the most effective way to solve complex electronic issues and restore the smooth, efficient operation you expect from your car. Order today and get your vehicle running right again.
Frequently Asked Questions
Do I need to send you my old ECM?
No, there is no core charge for this part. You do not need to send your original module back to us.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the ECM with the correct software and calibrations for your specific car. You can provide this during checkout or reply to your order confirmation email.
Is any additional programming required after installation?
The module ships fully programmed for your VIN. However, you will need to perform a security relearn procedure after installation so the module can communicate with your vehicle’s anti-theft system and keys. We provide easy-to-follow instructions for this process, which typically takes 10-30 minutes and does not require special tools.
How do I find the part number on my current ECM?
Your ECM is located in the engine compartment. The part number is typically on a white sticker on the main body of the module. This unit replaces multiple service numbers, so as long as your vehicle is listed in our fitment guide, this part will work for you.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to ensure you have properly diagnosed the problem, as the check engine light can be triggered by many other failing components like sensors or wiring.