Restore Your Vehicle’s Core Performance and Reliability
Is your Chevrolet Volt or other GM vehicle suffering from baffling electrical issues, a persistent Check Engine Light, or a frustrating no-start condition? As a technician with over two decades of diagnostic experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can wreak havoc on a perfectly good engine. It’s the brain of your vehicle, and when it falters, it can mimic a dozen other problems, leading to wasted time and money on incorrect repairs. This is your direct-fit, reliable solution to get your vehicle running right again.
This isn’t just a replacement part; it’s a complete, plug-and-play fix. We take the hassle and high cost out of the equation by programming this module specifically to your vehicle’s VIN before it ships. This means no expensive trips to the dealership for programming, no special scan tools required. You get a component loaded with the latest GM software updates, ensuring optimal engine performance, fuel efficiency, and emissions control from the moment you install it. This is the most efficient way to solve complex issues tied to the 2011-2015 Volt Engine Control Module and restore peace of mind.
A Technician’s Notebook
I remember a 2013 Volt that came into the shop with an intermittent no-start and a flashing security light. The owner had already replaced the battery and checked the starter. Scans showed a U0100 Lost Communication with ECM code, but it wasn’t consistent. After verifying the wiring and power/ground feeds to the module, we suspected an internal ECM fault. On these complex hybrid systems, a stable ECM is non-negotiable. We installed a VIN-programmed module just like this one, and the vehicle fired up instantly and never had the issue again. It saved the customer from a costly dealership diagnostic rabbit hole.
Common Signs of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel economy.
- ✔ Rough idling, stalling, or engine misfires.
- ✔ Transmission shifting problems or harsh engagement.
- ✔ Communication error codes, such as P0601, P0606, or U0100.
- ✔ Seemingly unrelated warning lights appearing on the dash.
A Straightforward Guide to Installation
Replacing the ECM is a task many DIYers can handle with basic tools. For the 2011-2015 Volt Engine Control Module, the process is quite accessible.
- Safety First: Always disconnect the negative terminal from your vehicle’s 12V battery and secure it away from the post.
- Locate the Module: On the 2011-2015 Volt, the gasoline engine’s ECM is typically found in the left-hand (driver’s side) rear of the engine compartment. Consult a service manual if you’re unsure.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New ECM: Mount the new, pre-programmed module in place and tighten the bolts. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which often involves turning the key to the ‘ON’ position for 10-15 minutes. Start the engine and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12643636 and several others across a wide range of GM vehicles. While it is a primary fit for the Chevy Volt, it is also compatible with many popular models. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Compatible with part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200
Fits select models of:
- Chevrolet Volt (2011-2015)
- Chevrolet Cruze (2012-2016)
- Chevrolet Sonic (2012-2016)
- Chevrolet Trax (2013-2016)
- Chevrolet Silverado 2500/3500 (2012-2016)
- GMC Sierra 2500/3500 (2012-2016)
- Buick Encore (2013-2016)
- Cadillac ELR (2014-2016)
- And many more GM cars, trucks, and vans.
Frequently Asked Questions
Do I need to do any programming after I receive it?
No. This module comes fully programmed to your vehicle’s VIN with the latest GM software. It is ready for installation right out of the box. A simple key cycle or security relearn procedure may be necessary, but no special tools are required.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Is this compatible with my vehicle if my old part number is different?
Yes, this module replaces multiple GM part numbers, including 12668866 and 12668994. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.
What if this doesn’t fix my problem?
While a faulty ECM is a common cause for the symptoms listed, we always recommend proper diagnostics. Ensure all wiring, power, and grounds to the module are checked. We stand by our parts, but cannot guarantee it will fix issues stemming from other components.
What is a security relearn procedure?
This is a simple process that syncs the new ECM with your vehicle’s anti-theft system. It typically involves turning the ignition to the ‘ON’ position (without starting the engine) for about 10-15 minutes until the security light on the dash stops flashing or turns off.