Get Your Workhorse Running Right Again
Is your Silverado, Sierra, or Savana van letting you down? When your work vehicle is stalling, running rough, or won’t start at all, it’s more than an inconvenienceโit’s costing you time and money. The Engine Control Module (ECM) is the brain of your truck’s engine, and when it fails, it can cause a host of frustrating and hard-to-diagnose issues. This is your direct, reliable solution to get back on the road and back to work with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing ECM is the likely culprit:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0606, or other internal module errors
- Engine stalling or cutting out unexpectedly
- Noticeable drop in fuel economy
- Rough idling or engine misfires
- No-start condition where the engine cranks but won’t fire up
- Transmission shifting problems or harsh shifts
This professionally prepared Programmed 12639471 ECM is the definitive fix for these problems. We take all the guesswork and dealership hassle out of the equation. By programming the module to your vehicle’s specific VIN before we ship, we ensure it’s ready for a straightforward installation right out of the box.
Features & Real-World Benefits
- โ VIN-Specific Programming: We flash the module with the latest GM-authorized software updates matched directly to your VIN. This ensures perfect communication with your vehicle’s other systems, just like the original part.
- โ Plug & Play Design: Because it’s pre-programmed, you can avoid expensive trips to the dealership for coding. This saves you hundreds in labor costs and gets your truck back in service faster.
- โ Resolves Known Issues: The updated software often corrects factory bugs and improves engine efficiency and performance beyond the original calibration.
- โ Rigorously Inspected: Every module is thoroughly inspected to guarantee it’s ready for dependable, long-term service in your hard-working truck or van.
- โ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
From the Technician’s Bench: We recently helped a contractor whose 2011 Sierra 4.3L was intermittently stalling at job sites. He’d replaced sensors and plugs, but the problem persisted, making him look unreliable to his clients. The issue was a failing internal processor in his original ECM. A junkyard part wouldn’t work due to the security system. We sent him this Programmed 12639471 ECM, he performed the simple 15-minute security relearn himself, and his truck has been rock-solid ever since. He’s not just back on the road; he’s back to running his business with confidence.
Frequently Asked Questions
Do I need to do anything after I install this ECM?
In most cases, you will need to perform a security relearn procedure (often called VATS or Passlock). This is a simple process that takes about 15-30 minutes, involves turning the key on and off, and does not require any special tools. We include instructions to guide you. A CASE (Crankshaft Angle Sensor Error) relearn may also be needed, which can be done with many high-end scan tools.
How do I provide you with my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive the VIN, as the programming is specific to your exact vehicle.
Is this a brand new part?
This is a high-quality, tested, and fully functional replacement part sourced from an original vehicle. Each unit is inspected and programmed to ensure it meets or exceeds OEM performance standards, providing a reliable and cost-effective solution.
Will this fit my truck if my old part number is different?
Yes. This module is a direct replacement for service numbers 12635043, 12639471, and 12653246. As long as your vehicle is listed in the compatibility chart, this part will work perfectly once programmed to your VIN.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your existing ECM (common codes P0601-P0606), then this Programmed 12639471 ECM is the correct solution. However, you should always ensure your vehicle has been properly diagnosed, as other failing sensors or wiring issues can also cause a check engine light.