Restore Peak Performance to Your GM Vehicle
Is your Cadillac ELR, Chevy Cruze, or Silverado acting up? Intermittent stalling, a persistent Check Engine Light, and erratic engine behavior are more than just annoyances—they’re often signs that the brain of your engine, the Engine Control Module (ECM), is failing. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty ECM can cause a cascade of confusing problems. This isn’t just a part; it’s the central command center for your vehicle’s performance, fuel economy, and emissions. This replacement 2014-2016 ELR Engine Control Module is the definitive solution to get your vehicle running reliably again.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest, most stable software updates directly from GM. This critical step ensures seamless communication with your car’s other systems and can even resolve underlying drivability issues that were present in the original factory software. You get a component that is truly ready for installation, saving you a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 2015 Chevy Volt (which shares a similar powertrain architecture with the ELR) that came into the shop with a baffling intermittent no-start condition. The owner had already replaced the battery and checked the starter. The scan tool showed a loss of communication code (U0100) that would come and go. After hours of tracing wires, we tested the ECM’s power and ground feeds, which were solid. The culprit was an internal failure in the ECM itself, causing it to randomly shut down. Swapping in a pre-programmed ECM like this one was the final fix. The customer was back on the road in under an hour, without needing to have their car towed to a dealer for expensive programming. This is the kind of straightforward, effective repair we aim to provide.
Common Signs of a Failing ECM
If your vehicle is experiencing any of the following, a failing engine computer could be the root cause. A failing ECM can often trigger a variety of Diagnostic Trouble Codes (DTCs), including the dreaded P0601, P0606, or U-series communication codes.
- ✔ Check Engine Light is on or flashing
- ✔ Vehicle refuses to start or has intermittent starting issues
- ✔ Noticeable drop in fuel efficiency
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Rough or unstable idle
- ✔ Failed emissions test
- ✔ Automatic transmission shifting erratically
A Straightforward Guide to Installation
Installing your new 2014-2016 ELR Engine Control Module is a manageable task for a confident DIYer. Following these steps will ensure a smooth process. Always consult a vehicle-specific repair manual if you are unsure about any step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On the 2014-2016 ELR, the ECM is typically found in the left-hand (driver’s side) rear of the engine compartment. For trucks and vans, it’s often on the LH front of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed ECM using the original hardware. Ensure it is secure.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click firmly into place. Reconnect the negative battery terminal.
- Perform Relearn Procedure: After installation, a security or key relearn procedure may be required. A common GM method is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times before attempting to start the engine. This allows the anti-theft system to recognize the new ECM.
Verified Vehicle Compatibility
This ECM is a direct-fit replacement for a wide range of General Motors vehicles. It is compatible with part numbers 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. Please match your part number or verify your vehicle is on the list below. Providing your VIN at checkout is required to ensure perfect programming.
- Cadillac ELR: 2014-2016
- Chevrolet Cruze: 2012-2016 (1.4L, Gasoline, VIN P)
- Chevrolet Sonic: 2012-2016 (1.4L)
- Chevrolet Spark: 2014-2015 (Gasoline)
- Chevrolet Trax: 2013-2016 (1.4L)
- Chevrolet Volt: 2011-2015
- Buick Encore: 2013-2016 (1.4L)
- Chevy Express / GMC Savana 2500/3500 Van: 2016 (4.8L, 6.0L)
- Chevy Silverado / GMC Sierra 2500/3500 Pickup: 2012-2016 (6.0L)
- GMC Sierra Denali 2500/3500: 2012-2016 (6.0L)
- Chevrolet Suburban 3500: 2016
Don’t let a bad computer keep you off the road. Order this pre-programmed 2014-2016 ELR Engine Control Module today and restore your vehicle’s proper function and reliability.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the module with the exact software and calibrations for your specific vehicle. This ensures it works correctly with your engine, transmission, and options package right out of the box.
Is this a simple plug-and-play installation?
Yes, because we program it to your VIN, it is designed to be as close to plug-and-play as possible. However, as with most modern GM vehicles, you will likely need to perform a simple key/security relearn procedure after installation, which typically does not require special tools.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (common codes P0601, P0606, U0100), then this part is the correct fix. It’s always best to have the codes professionally diagnosed to confirm the ECM is the point of failure before ordering.
Does this module come with the latest GM software?
Absolutely. We flash every module with the most current software available from GM for your specific VIN. This can often correct drivability issues that were not addressed by the original software your car came with.
What if I have questions during installation?
While we cannot provide vehicle-specific repair advice, we recommend consulting a professional repair manual or a qualified local mechanic. The installation is straightforward, but it’s always best to be prepared.