Restore Peak Performance to Your Vehicle with a VIN-Programmed ECM
Is your Chevrolet, Pontiac, or Daewoo suffering from erratic engine behavior, a no-start condition, or persistent check engine lights that won’t go away? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine, fuel, and emissions systems. This replacement ECM, part number 12642927, is the definitive solution to restore your vehicle’s reliability and drivability. We take the guesswork and high dealership costs out of the equation by pre-programming this module specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures a seamless, plug-and-play installation process without the need for expensive dealer tools or additional programming.
From the Diagnostic Bay
We had a 2011 Chevy Cruze come into the shop with a complaint of random stalling and a check engine light for a throttle position sensor code that kept returning, even after the sensor was replaced twice. The technician was about to replace the entire throttle body. After checking the wiring and finding no issues, we focused on the ECM. We noticed that the 5-volt reference signal from the ECM to the sensor was fluctuating slightly. By swapping in a known-good, programmed ECM, the voltage stabilized, the code vanished, and the stalling issue was completely resolved. It’s a classic case where the root cause wasn’t the sensor itself, but the computer controlling it. A faulty ECM can send you chasing ghosts, but replacing it with a correctly programmed unit is often the final, correct fix.
Is Your Vehicle Exhibiting These Common ECM Failure Symptoms?
A failing ECM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following issues, your engine computer could be the culprit. This replacement 2009-2010 G3 ECM is designed to resolve these problems and get you back on the road with confidence.
- ✔ Check Engine Light: The check engine light is on, and you may have communication error codes (U-codes) or codes related to sensors that have already been replaced.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially as it warms up.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can be due to the ECM not firing the ignition coils or fuel injectors.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s gas mileage can be caused by the ECM failing to manage the air-fuel mixture correctly.
- ✔ Transmission Shifting Problems: On automatic models, the ECM communicates with the transmission controller. A faulty ECM can lead to harsh shifting, delayed engagement, or getting stuck in a single gear.
- ✔ Intermittent Electrical Issues: Seemingly random problems like cooling fans not turning on or erratic gauge behavior can sometimes be traced back to a failing engine computer.
Why Choose a VIN-Programmed 2009-2010 G3 ECM?
The Engine Control Module is not a one-size-fits-all part. Each vehicle has unique software based on its specific options, emissions standards, and powertrain. Our professional programming service ensures this module is a perfect match for your car. We flash it with the latest GM-certified software updates, which can often resolve factory bugs and improve overall performance and efficiency. When you receive your part, it’s ready for installation right out of the box. Simply provide your VIN at checkout, and we handle the complex programming for you.
Guaranteed Compatibility
This module is a direct replacement for several original part numbers, ensuring wide-ranging compatibility. It is compatible with the following part numbers: 12679199, 12642927, 12636386, 12621466, and 12630789. It is designed to fit the following vehicles:
- 2011-2012 Chevrolet Cruze (with 1.8L engine)
- 2009-2011 Chevrolet Aveo
- 2013 Chevrolet Spark
- 2009-2010 Pontiac Wave
- 2013-2014 Chevrolet Trax (with 1.8L engine)
- 2012 Chevrolet Sonic (with 1.8L engine)
- 2009-2010 Pontiac G3
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN. We cannot ship the module until we have this information, as the programming is specific to your car. You can add the VIN to the notes at checkout or send it to us in a message.
Is this part truly plug-and-play?
Yes. Because we program the module to your VIN, it will communicate with your vehicle’s other systems correctly upon installation. In most cases, no further programming is needed. However, some vehicles may require a simple security relearn procedure, which can be done without special tools and typically takes 10-15 minutes. Instructions can be provided upon request.
Do I need to send my old ECM back?
There is no core charge for this part. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
How do I know if the ECM is really the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed by a qualified mechanic. This includes checking for bad grounds, wiring issues, and faulty sensors before condemning the ECM. A proper diagnosis can save you time and money.
What if I install it and still have issues?
Our modules are thoroughly tested before shipping. If you still experience issues after installation, it is likely that another underlying problem exists with the vehicle. We recommend re-checking all wiring, grounds, and related sensors to ensure they are functioning correctly.