Is Your Pontiac G3 Running Rough, Stalling, or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems in your 2009 or 2010 Pontiac G3, a failing Engine Control Module (ECM) is often the culprit. I’ve been a technician for over 20 years, and I’ve seen firsthand how a faulty engine computer can cause a cascade of issues that seem impossible to diagnoseโfrom erratic idling and poor fuel mileage to a car that won’t start at all. You’re not just buying a part; you’re buying a solution to get your vehicle running reliably again.
This isn’t just any replacement part. This is a dependable ECM, part number 12679199, that we program specifically for your vehicle using your VIN. We load the latest, most stable software from GM, ensuring your engine operates at its best. This process corrects factory bugs and adjusts for component wear, often resulting in smoother performance and better efficiency than the original module.
Common Symptoms of a Failing 2009-2010 G3 ECM
A bad engine computer can manifest in many ways. If you’re experiencing any of the following, your ECM is the likely cause:
- โ Unexplained Check Engine Light (CEL) illumination
- โ Engine stalling, stumbling, or hesitating during acceleration
- โ Complete no-start condition where the engine cranks but won’t fire
- โ Noticeable decrease in fuel economy
- โ Transmission shifting problems or harshness
- โ Communication errors with diagnostic scan tools
A Real-World Scenario from My Shop
“A customer’s 2010 G3 came in last week with these exact symptomsโit would crank but not start, and the cooling fans ran constantly as soon as the key was turned. The owner had already replaced the battery and checked fuses. A quick scan showed no communication with the powertrain control module. After confirming the module had proper power and ground at the connector, it was clear the internal processor had failed. This pre-programmed ECM is the exact fix we used to get them back on the road the same day, without a tow to the dealer.”
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest hurdles in replacing an ECM is the need for expensive dealership programming. We eliminate that step completely. By providing us with your Vehicle Identification Number (VIN) during checkout, we handle all the programming for you. When the part arrives, it’s ready to install.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the Pontiac G3, the ECM is typically found in the engine bay, often near the battery or firewall.
- Disconnect the Harnesses: Carefully unclip the wiring harness connectors from the old module.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect Everything: Securely plug the wiring harnesses into the new module and reconnect the negative battery terminal.
- Perform Idle Relearn (If Needed): Start the vehicle and let it idle for 5-10 minutes to allow the computer to learn the engine’s parameters. Your G3 is ready to drive!
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and is compatible with several part numbers. If your original module has any of the following numbers, this part will work for you:
Compatible Part Numbers: 12679199, 12642927, 12636386, 12621466, 12630789
This part will fit these makes and models with these options:
- CRUZE 11-12 Electronic Control Module; 1.8L
- AVEO 09-11 Electronic Control Module
- SPARK 13 Electronic Control Module
- WAVE 09-10 Electronic Control Module
- TRAX 13-14 Electronic Control Module; 1.8L
- SONIC 12 Electronic Control Module; 1.8L
- G3 09-10 Electronic Control Module
Don’t let a faulty ECM keep you off the road. Order today, provide your VIN, and get the simple, reliable solution delivered to your door.