Is Your Truck Running Rough? Restore Its Brainpower.
If your 2010-2013 GMC Sierra or Chevrolet Silverado 1500 with the 4.3L V6 engine is experiencing perplexing issues like stalling, poor fuel economy, a persistent check engine light, or erratic behavior, the root cause is often a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire vehicle’s performance suffers. This isn’t just an inconvenience; it can be a critical failure that leaves you stranded. Don’t let a faulty computer dictate your truck’s reliability. This direct-fit ECM, part number 12635043, is the definitive solution to restore your vehicle’s performance and dependability.
The Simple, Programmed Solution for Your 2010-2013 Sierra 1500 ECM
Replacing an ECM used to mean a costly trip to the dealership for installation and programming. We’ve eliminated that hassle. When you order from us, you’re not just getting a part; you’re getting a complete, ready-to-install solution. We take your vehicle’s unique Vehicle Identification Number (VIN) and program the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance, tailored specifically for your truck. The module arrives at your door ready for installation, saving you time, money, and the headache of coordinating with a service center.
From the Diagnostic Bay
We had a 2011 Silverado 1500 4.3L come into the shop with a complaint of a random, harsh 1-2 shift and an intermittent P0300 (Random Misfire) code. The owner had already replaced the spark plugs, wires, and ignition coil pack, but the problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed the injector pulse width on cylinder 3 was erratic at idle. All wiring checked out fine. We suspected the injector driver inside the ECM was failing. We installed one of our pre-programmed modules, performed the quick 10-minute security relearn, and the truck ran perfectly. The harsh shift was gone, the misfire disappeared, and the customer was thrilled to have his reliable work truck back without paying dealership prices.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or unstable idle
- ✔ Noticeable decrease in fuel economy
- ✔ Engine misfires or hesitation during acceleration
- ✔ Harsh or incorrect transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with diagnostic scan tools
Guaranteed Fitment & Compatibility
This Engine Control Module is a direct replacement for several original equipment service numbers, ensuring broad compatibility. Your purchase is guaranteed to be the correct fit for the following vehicles equipped with the 4.3L V6 engine:
- 2010-2013 GMC Sierra 1500 Pickup (Located LH front under battery)
- 2010-2013 Chevrolet Silverado 1500 Pickup (Located LH front under battery)
- 2010-2014 GMC Savana 1500 Van (Located LH rear engine compartment)
- 2010-2014 Chevrolet Express 1500 Van (Located LH rear engine compartment)
This module replaces the following service numbers: 12635043, 12639471, 12653246. By providing your VIN, we ensure the software loaded onto the module is an exact match for your vehicle’s specific configuration.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide your vehicle’s VIN at checkout, and we will flash it with the latest GM-certified software for your specific vehicle.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your truck. It contains information about the manufacturer, model, and specific options. We use the VIN to access the exact factory software and calibrations your vehicle requires for the engine and transmission to operate correctly.
Is any other procedure needed after installation?
Yes, you will need to perform a security relearn procedure, also known as a Passlock or anti-theft relearn. This procedure syncs the new ECM to your vehicle’s anti-theft system. It can typically be done without any special tools and involves a series of key cycles. Instructions are readily available online or in service manuals.
Where is the ECM located on my 2012 Sierra 1500?
On the 2010-2013 Sierra and Silverado 1500 pickups, the ECM is located in the engine bay on the driver’s side (LH), underneath the battery tray. You will need to remove the battery to access it.
Will this part fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first. The ECM can be the cause of many codes, but it’s important to rule out other potential issues like faulty sensors or wiring.