Get Your Work Van Back on the Road Fast
Is your 2016 GMC Savana 2500 van running rough, stalling, or refusing to start? A faulty Engine Control Module (ECM) is often the culprit behind these frustrating and costly issues. As the brain of your vehicle’s engine, the ECM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, it can bring your work to a grinding halt. This replacement Engine Control Module, part number 12643636, is the reliable solution to restore your van’s performance and get you back in business.
The VIN-Programmed Advantage
Don’t waste time and money at the dealership with a blank module that requires expensive programming and calibration. We take the hassle out of the process. When you order from us, we flash the module with the latest, most up-to-date GM factory software specifically for your vehicle. All we need is your van’s Vehicle Identification Number (VIN) during checkout. This ensures that the module you receive is a true plug-and-play component, ready for installation right out of the box. This tailored programming ensures all systems communicate correctly, restoring the original performance and efficiency you depend on.
From the Diagnostic Bay
We had a customer with a 2016 Express van (a cousin to the Savana) that was a nightmare for another shop. The van had a persistent random misfire and terrible fuel economy. The previous mechanic had replaced all the spark plugs, coils, and even a fuel injector, but the problem remained. The van finally came to us, and after hooking up our diagnostic tools, we noticed erratic data from the ECM. The module wasn’t correctly commanding the ignition coils. We installed one of our VIN-programmed ECMs, performed the quick security relearn, and the van ran perfectly. The customer had spent over a thousand dollars on unnecessary parts when the root cause was the computer all along. A correct diagnosis and a properly programmed module saved the day.
Is Your 2016 Savana 2500 ECM Failing?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following symptoms, your ECM could be the problem:
- ✔ Check Engine Light is on with various communication or sensor-related trouble codes (e.g., U-codes, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The cooling fans run constantly, even when the engine is cold.
- ✔ Your diagnostic scan tool cannot communicate with the engine computer.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for original part number 12643636 and is also a compatible replacement for several other GM part numbers, including 12668866, 12668994, 12663405, 12670335, 22819494, and 12692200. While this listing is focused on the 2016 Savana 2500 ECM, this versatile unit also fits a wide range of other GM vehicles such as the Chevrolet Silverado, GMC Sierra, Chevrolet Cruze, Buick Encore, and more. Please verify the part number to ensure a perfect match for your vehicle.
Installation is straightforward for any competent mechanic or experienced DIYer. Simply disconnect the battery, locate and unplug the old ECM, install the new one, and reconnect the battery. In most cases, the vehicle will start and run perfectly. Some GM vehicles may require a simple security relearn procedure (often called a “key relearn”) which can typically be done without special tools and takes about 30 minutes. Instructions for this procedure are widely available online or in your vehicle’s service manual.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN is essential for us to program the ECM with the correct software and calibrations for your specific engine, transmission, and options. This ensures seamless integration and optimal performance without a trip to the dealer.
Is this part difficult to install?
Installation is generally simple. It involves disconnecting the battery, swapping the module, and reconnecting the battery. Some vehicles may require a security relearn procedure, which is a straightforward process that you can often do yourself.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, this replacement module will resolve the issue. However, if the light is on due to other failing components (like a bad sensor), those issues will still need to be addressed. This module fixes problems originating from the computer itself.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM controls both the engine and the transmission, while an ECM typically just controls the engine. In modern vehicles like your Savana, the unit functions as a PCM, but the term ECM is still widely used.
How do I know for sure my ECM is the problem?
The best way to be certain is to have a professional diagnosis. However, common indicators include multiple unrelated error codes, communication failures with a scan tool, and symptoms that persist after replacing related sensors. If you’ve checked all other possibilities, the ECM is a likely culprit.