Restore Your Vehicle’s Performance and Reliability
Is your Chevrolet, Pontiac, or GM vehicle suffering from frustrating and intermittent engine problems? A faulty Engine Control Module (ECM) is often the hidden culprit behind issues like stalling, rough idling, a persistent check engine light, or a complete no-start condition. As a technician with over 20 years of experience, I’ve seen firsthand how a failing ECM can mimic a dozen other problems, leading to expensive and incorrect repairs. This replacement Engine Control Module, part number 12602044, is the definitive solution to get your vehicle running smoothly and efficiently again.
This isn’t just a part in a box. We provide a crucial service that saves you a trip to the dealership and hundreds of dollars in programming fees. Before we ship your module, we will flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between the new ECM and all other systems in your car, restoring original performance and fuel economy. A properly functioning 2006 Cobalt Engine Module is the brain of your vehicle, and providing it with the correct, updated software is essential for a lasting repair.
A Technician’s Notebook: The Intermittent No-Start Mystery
I once had a 2006 Pontiac G6 with the 3.6L V6 in my bay that was causing its owner endless headaches. It would randomly refuse to start, but only after it was warm. The owner had already replaced the battery and starter to no avail. We scanned it and found no current DTCs, but in the history, we saw a U0100 (Lost Communication with ECM/PCM) and a P0603 (Internal Control Module Keep Alive Memory Error). These are classic signs of an ECM beginning to fail internally, often due to heat-related stress on the circuit board. After confirming all power and ground connections to the computer were solid, we installed a VIN-programmed ECM. The intermittent no-start condition was completely resolved, and the customer was thrilled to have their reliable car back. This is a common failure mode for this family of modules.
Common Signs of a Failing ECM
If you’re experiencing any of the following, a faulty engine computer could be the cause. Don’t keep throwing parts at the problem—address the root cause.
- ✔ Check Engine Light is on with codes like P0601, P0602, P0604, P0605, or P0606.
- ✔ Vehicle has trouble starting or won’t start at all.
- ✔ Engine stalls, stutters, or misfires unpredictably.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
Your Straightforward Installation Guide
Installing your replacement 2006 Cobalt Engine Module is a job most DIY enthusiasts can handle. While the exact location varies by model (see fitment list), the general process is consistent.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work.
- Locate the ECM: On a 2006 Cobalt, the ECM is typically found in the left-hand (driver’s side) front of the engine compartment. For other models, it may be on the firewall or near the air cleaner box.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. There are usually two or three large connectors with locking tabs. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed ECM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key-on/key-off procedure to sync the new ECM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle should then start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. It fits a wide range of GM, Saab, and Isuzu vehicles. Please verify your specific model and engine in the list below.
ACADIA 07-08 Electronic Control Module; (behind fan shroud), ID 12607096 (ECM)
ALLURE 08-09 Electronic Control Module; (lower air cleaner housing), 5.3L
AURA 08-09 Electronic Control Module; (RH firewall), 2.4L, w/hybrid
AURA 08-09 Electronic Control Module; (RH firewall), 3.6L
CANYON 08 Electronic Control Module; (RH firewall)
COLORADO 08 Electronic Control Module; (RH firewall)
CTS 06 Electronic Control Module; (RH engine compartment), V-Series, ID 12603530
DEVILLE 05 Electronic Control Module; (LH engine compartment), ID 12590032
DTS 06, 08 Electronic Control Module
ENCLAVE 08 Electronic Control Module; (behind fan shroud)
ENVOY 07-09 & TRAILBLAZER 07-09 (various engines, check specific IDs)
G6 06-09 (various engines and IDs, please verify)
GRAND PRIX 08 Electronic Control Module; (lower air cleaner box), 5.3L
HHR 06 Electronic Control Module; (LH rear engine compartment), 2.4L
HUMMER H3 08 Electronic Control Module; (RH firewall)
IMPALA 06, 08-09 (various engines)
ION 06 Electronic Control Module; 2.4L (opt LE5)
ISUZU ASCENDER, I-290, I-370 08 (check specific IDs)
…and many more. Please check the full list above to confirm your exact vehicle.
Frequently Asked Questions About Your New ECM
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. Providing your VIN is critical. We use it to load the precise factory software and calibrations for your specific vehicle. This step ensures your engine, transmission, and all related electronics work together correctly, just as the manufacturer intended.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. The most important parts are safely disconnecting the battery and being gentle with the wiring connectors. The final security relearn procedure requires no tools at all, just patience.
What is a ‘security relearn’ and why is it necessary?
The security relearn (also called a Passlock or anti-theft relearn) is a simple procedure that syncs your new 2006 Cobalt Engine Module to your vehicle’s ignition key and security system. Without this step, the anti-theft system will prevent the engine from starting. It’s a built-in security feature on all modern GM vehicles.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your old ECM (common codes P0601-P0606), then yes, this part will resolve the issue. However, if the light is on for another reason, like a bad oxygen sensor, you will still need to diagnose and repair that separate problem.
What makes your module different from one from a salvage yard?
A salvage yard module will have the programming from the donor vehicle, which will not work correctly in your car. It would require a trip to a dealer for expensive programming. Our modules arrive pre-programmed for your specific VIN with the latest software, making the process much simpler and more reliable.