Is Your GM Truck or Van Plagued by Electrical Gremlins?
If you’re dealing with a 2010-2014 Savana, Express, Silverado, or Sierra that’s running poorly, stalling unexpectedly, or refusing to start, a failing Engine Control Module (ECM) is a likely culprit. The ECM is the central computer of your vehicle’s engine management system, controlling everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems, leaving your reliable workhorse dead in the water.
From the Diagnostic Bay
We once had a 2012 Express 1500 work van that was driving its owner crazy. It would stall at stoplights intermittently but never stored a consistent trouble code. The owner had already replaced the fuel pump and several sensors with no luck. After hooking up our diagnostic scanner and monitoring live data, we noticed the 5-volt reference signal from the ECM would briefly drop out right before the engine cut off. This pointed directly to an internal fault in the module. We installed a new, VIN-programmed ECM, and the van ran perfectly. It’s often these hard-to-trace intermittent issues that a fresh, reliable module solves for good.
Common Symptoms of a Failing ECM
- ✔ An illuminated Check Engine Light (CEL) with communication-related codes (U-codes) or internal processor fault codes (P06xx).
- ✔ The engine cranks but refuses to start.
- ✔ Intermittent stalling, stumbling, or misfiring, especially after the vehicle has warmed up.
- ✔ A noticeable decrease in fuel economy and overall engine performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inability for a diagnostic scan tool to communicate with the engine computer.
- ✔ Issues with other electronic systems, as the ECM communicates with multiple modules throughout the vehicle.
The Simple Solution: Your Programmed Savana 1500 Engine Control Module
Don’t let a faulty computer keep your truck off the road or force you into an expensive trip to the dealership. This direct-fit Savana 1500 Engine Control Module is the perfect solution to restore your vehicle’s performance and reliability. We take the hassle out of the replacement process. Simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during checkout, and our technicians will program the module with the latest, most stable GM-certified software specific to your exact vehicle configuration. This ensures that when the part arrives, it’s a true plug-and-play installation.
Guaranteed Compatibility and Fitment
This ECM, part number 12639471, is a direct replacement for several service numbers, including 12635043, 12639471, and 12653246. It is guaranteed to fit and function correctly on the following vehicles equipped with the 4.3L V6 engine:
- 2010-2014 Chevrolet Express 1500 Van
- 2010-2014 GMC Savana 1500 Van
- 2010-2013 Chevrolet Silverado 1500 Pickup
- 2010-2013 GMC Sierra 1500 Pickup
Installation is straightforward. For vans, the ECM is typically located in the left-hand rear of the engine compartment. For pickups, it’s found on the left-hand front side, under the battery tray. After physically swapping the module, you may need to perform a simple security relearn procedure, which can be done without any special tools. This process typically involves cycling the ignition key and takes about 10-15 minutes, synchronizing the new ECM with your vehicle’s anti-theft system.
Frequently Asked Questions
What information do I need to provide?
After your purchase, you must provide us with your vehicle’s 17-digit VIN. This is crucial for us to program the module with the correct software and calibrations for your specific truck or van.
Is this a plug-and-play part?
Yes, because we program it to your VIN before shipping, it is designed to be a plug-and-play installation. In some cases, a simple, tool-free security relearn procedure (often called a ‘key-on/key-off’ cycle) may be required to sync the module with your vehicle’s anti-theft system.
Do I need to send in my old module?
No, there is no core charge or need to send your old part back to us. This is a new replacement part, not a repair service for your old one.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty ECM, this part will resolve the issue. However, it’s essential to ensure your vehicle has been properly diagnosed, as other faulty sensors or wiring issues can cause similar symptoms. This module corrects problems originating from the computer itself.
Where is the ECM located on my vehicle?
For the Savana and Express vans, the ECM is located in the LH rear of the engine compartment. For Silverado and Sierra pickups, it is found in the LH front area, underneath the battery.