Is Your Sierra 1500 Running Rough? Get Back on the Road Fast.
If you’re experiencing frustrating issues like a persistent check engine light, stalling, rough idling, or a no-start condition in your 2010-2013 GMC Sierra or Chevrolet Silverado, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the central computer of your truck’s engine, managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, it can cause a cascade of problems that can leave you stranded. This direct-fit replacement ECM, part number 12639471, is the definitive solution to restore your truck’s performance and reliability.
The Plug-and-Play Solution Your Truck Needs
Don’t waste time and money at the dealership with expensive diagnostics and programming fees. We take the guesswork out of the repair. When you order from us, we flash the module with the latest official GM software updates specifically for your truck. All we need is your 17-digit Vehicle Identification Number (VIN) during checkout. The module you receive will be completely programmed and ready for a straightforward installation. This process ensures perfect compatibility and function, just like the original part from the factory.
Diagnosing a Faulty 2010-2013 Sierra 1500 ECM
A failing engine computer can manifest in numerous ways, often intermittently at first. If your truck is showing any of the following symptoms, it’s time to consider a replacement ECM. This module is the correct part to resolve these common issues and restore peak operating condition.
- ✔ Check Engine Light: A constant or flashing check engine light (CEL) is the most obvious sign. You may see communication-related codes (U-codes) or specific processor fault codes.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly while driving or at idle. You might also experience random misfires that don’t seem to be related to spark plugs or coils.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can happen if the ECM is not properly controlling the fuel pump or ignition system.
- ✔ Poor Fuel Economy: If the ECM isn’t calculating the air-fuel mixture correctly, you’ll notice a significant drop in your truck’s MPG.
- ✔ Erratic Shifting: The ECM works closely with the Transmission Control Module (TCM). A faulty ECM can send incorrect data, leading to harsh or delayed gear changes.
- ✔ Failed Emissions Test: An inability to pass a smog check is a common indicator of an ECM that is no longer managing the emissions systems correctly.
Guaranteed Fitment & Compatibility
This Engine Control Module is a guaranteed fit for a range of GM trucks and vans equipped with the 4.3L V6 engine. It directly replaces service numbers 12635043, 12639471, and 12653246. Please verify your vehicle is on the list below to ensure compatibility.
- GMC Sierra 1500: 2010, 2011, 2012, 2013 (4.3L Engine)
- Chevrolet Silverado 1500: 2010, 2011, 2012, 2013 (4.3L Engine)
- GMC Savana 1500 Van: 2010, 2011, 2012, 2013, 2014 (4.3L Engine)
- Chevrolet Express 1500 Van: 2010, 2011, 2012, 2013, 2014 (4.3L Engine)
Installation is simple for the average DIY mechanic. On the Sierra and Silverado, the ECM is located in the engine bay on the driver’s side, underneath the battery tray. Simply disconnect the battery, remove the battery and tray, unplug the electrical connectors from the old module, swap it with your new pre-programmed unit, and reconnect everything. In some cases, a security relearn procedure may be required, which can typically be done without special tools by cycling the key.
Frequently Asked Questions
Do I need to program this ECM?
No. This is the biggest benefit of ordering from us. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN, and the module will arrive ready to install.
Where is the ECM located on my 2011 Sierra 1500?
For the 2010-2013 Sierra and Silverado 1500 pickups, the ECM is located in the engine compartment on the driver’s side (LH), underneath the battery and battery tray.
Is this a difficult part to install?
For someone with basic mechanical skills, this is a straightforward job. It involves disconnecting the battery, removing it and its tray, and then swapping the module. No special tools are typically required, though you may need to perform a simple security relearn procedure after installation, which involves cycling the ignition key.
What information do you need from me?
We only need your vehicle’s 17-digit VIN to flash the module with the correct GM software for your truck’s specific configuration. You can typically find the VIN on your driver’s side door jamb sticker or on the dashboard visible through the windshield.
Will this fix my check engine light?
If the ECM itself is the cause of the check engine light, then yes, this part will solve the problem. However, it’s crucial to diagnose the vehicle correctly. If another component (like a bad sensor) caused the original ECM to fail, you must fix that underlying issue as well to prevent damage to the new module.