Is Your GM 4.3L Truck or Van Running Rough?
If you’re dealing with a frustrating no-start condition, erratic idling, a persistent Check Engine Light, or poor fuel economy in your work van or truck, a failing Engine Control Module (ECM) is often the culprit. For years, this meant a costly trip to the dealership for diagnostics, an expensive part, and hours of programming fees. We’ve changed that. This is a direct-fit, fully programmed Engine Control Module that gets you back on the road or back to the job site quickly and affordably.
The Brain of Your Engine, Restored.
The ECM is the central computer for your vehicle’s engine, managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, the symptoms can be widespread and confusing. Our solution provides a reliable replacement that’s ready to install right out of the box. We take your vehicle’s unique VIN and flash this module with the latest, most stable software updates directly from GM. This ensures perfect communication with your vehicle’s other systems and restores the performance you depend on.
“A customer’s 2012 Silverado 1500 with the 4.3L was towed in last month. It would crank but never start. The owner had already replaced the fuel pump and filter, thinking that was the issue. After 10 minutes with my scan tool, I saw no communication from the ECM. We confirmed the module had power and ground, pointing to internal failure. Installing one of our pre-programmed modules had his truck running perfectly in under 30 minutes, saving him from what would have been a $1200+ bill at the dealer.”
Common Symptoms of a Failing 4.3L ECM:
- โ Complete no-start or intermittent starting problems.
- โ Engine stalling unexpectedly while driving or at idle.
- โ Noticeable decrease in fuel mileage.
- โ Check Engine Light is on with communication-related codes (U-codes) or various sensor codes.
- โ Harsh or erratic automatic transmission shifting.
- โ The engine runs rough, misfires, or hesitates on acceleration.
Your Solution: A Pre-Programmed 2010-2014 Savana 1500 Engine Module
This isn’t just a part; it’s a complete solution. By programming the module to your VIN before it ships, we eliminate the most difficult part of the repair. You don’t need specialized scan tools or a subscription to dealer software. This is a true DIY-friendly fix that restores your vehicle’s core functionality.
Plug-and-Play Installation: No Dealer Visit Required
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for all systems to discharge.
- Locate the ECM: On Savana/Express vans, it’s in the LH rear of the engine compartment. On Silverado/Sierra pickups, it’s on the LH front, under the battery tray.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the old module. Inspect the pins for any corrosion or damage.
- Remove Old Module: Unbolt the original ECM from its mounting bracket.
- Install New Module: Bolt your new, pre-programmed module into place.
- Reconnect Everything: Firmly seat the wiring harness connectors until they click into place. Reconnect your negative battery terminal.
- Final Step: The vehicle may need to run for a few minutes to relearn its idle strategy. A security relearn procedure may be required, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Guaranteed Fitment & Compatibility
This module is a direct replacement for units with service numbers 12635043, 12639471, or 12653246. Please provide your VIN upon purchase to ensure we send you a perfectly matched and programmed part.
This part will fit these makes and models with the 4.3L engine option:
- 2010-2014 GMC Savana 1500 Van
- 2010-2014 Chevrolet Express 1500 Van
- 2010-2013 GMC Sierra 1500 Pickup
- 2010-2013 Chevrolet Silverado 1500 Pickup