Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Cruze, Sonic, or Silverado running rough, stalling unexpectedly, or flashing a persistent Check Engine Light? You’re not just dealing with an annoyance; you’re likely facing a failing Engine Control Module (ECM), the central computer of your vehicle. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of frustrating, hard-to-diagnose problems. This isn’t just a part; it’s the solution to getting your vehicle’s reliability and performance back on track.
This genuine GM Engine Control Module, part number 12663405, is your direct-fit, hassle-free fix. The biggest challenge with ECM replacement has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. Before this module ships, our experts will flash it with the latest official GM software, precisely matched to your vehicle using your VIN. It arrives at your door ready for installation, saving you hundreds in dealer fees and getting you back on the road faster.
A Technician’s Notebook: The Intermittent No-Start
A 2014 Chevy Cruze came into my bay with a maddening issue: it would randomly refuse to start. No crank, no click, nothing. The battery was good, the starter checked out, but an hour later, it would fire right up as if nothing happened. The owner was at his wit’s end. After hooking up my scan tool, I noticed intermittent U0100 ‘Lost Communication with ECM/PCM’ codes. On these GM platforms, this is a classic sign of the ECM’s internal processor beginning to fail. We installed a VIN-programmed module just like this one. The key relearn took two minutes, and the car has started perfectly ever since. It’s a textbook example of how this single component can solve a problem that seems impossible to pin down.
Is Your Vehicle Showing These Telltale ECM Failure Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution. Look out for these common signs and diagnostic trouble codes (DTCs):
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A complete no-start or difficult starting condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication error codes, such as U0100, when using a scan tool.
- ✔ Internal module failure codes, most commonly P0601, P0603, or P0606.
A Straightforward Guide to Installation
Replacing the ECM is a job most DIYers with basic tools can handle in under an hour. Our pre-programming makes it even simpler. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the systems to discharge.
- Locate the Old ECM: On most supported vehicles like the Cruze or Sonic, the ECM is located in the engine bay, often near the battery or firewall. It’s a silver metal box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip and remove all electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed ECM into place. Reconnect all electrical connectors firmly until they click, ensuring they are in their original positions.
- Reconnect Power: Reattach the negative battery terminal and tighten it securely.
- Perform Security Relearn: You may need to perform a simple key relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new ECM. Then, start the engine.
Verified Vehicle Compatibility
This ECM is a direct replacement for a wide range of General Motors vehicles. Please verify your model and options below. This module replaces part numbers 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
- Buick Encore: 2013-2016 (1.4L)
- Cadillac ELR: 2014-2016 (Gasoline)
- Chevrolet Cruze: 2012-2015 (Gasoline, 1.4L), 2016 (Limited, VIN P)
- Chevrolet Express 2500/3500 Van: 2016 (4.8L, 6.0L)
- Chevrolet Silverado 2500/3500 Pickup: 2012-2016 (6.0L)
- Chevrolet Sonic: 2012-2016 (1.4L)
- Chevrolet Spark: 2014-2015 (Gasoline)
- Chevrolet Suburban 3500: 2016
- Chevrolet Trax: 2013-2016
- Chevrolet Volt: 2011-2015 (Gasoline)
- GMC Savana 2500/3500 Van: 2016 (4.8L, 6.0L)
- GMC Sierra 2500/3500 & Denali Pickup: 2012-2016 (6.0L)
Frequently Asked Questions
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, just like a new part from the dealer.
Is this part difficult to install?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, just like a new part from the dealer.
Will this fix my Check Engine Light?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, just like a new part from the dealer.
What is the difference between an ECM and a PCM?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, just like a new part from the dealer.
Do I need to do anything after installation?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the ECM with the exact software and calibrations for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, just like a new part from the dealer.