Is your 2010-2014 Chevy Express or GMC Savana van running poorly, stalling, or showing a persistent check engine light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine performance, fuel economy, and emissions. A faulty ECM can cause a cascade of frustrating and difficult-to-diagnose issues, leaving you stranded and facing expensive repair bills. This direct-fit Engine Control Module, part number 12653246, is the definitive solution to restore your vehicle’s reliability and performance.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and additional cost out of the repair by pre-programming the module specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will flash the unit with the latest, most stable software updates directly from General Motors. This ensures perfect compatibility and optimal performance right out of the box, saving you a trip to the dealership and the high costs associated with their programming services.
From the Diagnostic Bay
We had a 2013 Silverado 1500 with the 4.3L V6 come in with a really bizarre issue. The owner complained of random stalling at stoplights, but it would always start right back up. There were no consistent trouble codes, just a generic U-code pointing to a communication loss that would appear and disappear. We checked the battery, alternator, grounds, and wiring harnesses for hours, finding nothing. On a hunch, we monitored the ECM’s internal temperature data stream and noticed it would spike just before a stall. The module was failing internally when it got warm, but not enough to set a hard fault. We replaced it with a pre-programmed unit like this one, performed the security relearn, and the truck ran perfectly. It’s a great example of how a failing ECM can create ghost-in-the-machine problems that are nearly impossible to track down without replacing the unit.
Is Your GM 4.3L Vehicle Showing These Symptoms?
A failing engine computer can manifest in numerous ways. If your truck or van is experiencing any of the following, a faulty ECM could be the culprit:
- ✔ Check Engine Light: The light is on, and you may have codes related to sensors, communication, or processor faults.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s MPG.
- ✔ Engine Stalling or Misfiring: The engine may stall intermittently, misfire, or run rough, especially when warm.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and fuel supply.
- ✔ Transmission Shifting Issues: The ECM communicates with the transmission controller, and a fault can lead to harsh or erratic shifting.
- ✔ Failed Emissions Test: Inability to pass a smog check due to monitor readiness issues or specific trouble codes.
- ✔ Loss of Power: The vehicle feels sluggish and lacks the acceleration it once had.
The Plug-and-Play Solution: Your Pre-Programmed Express 1500 Engine Module
Replacing the Express 1500 Engine Module is a straightforward process that can be performed by a competent DIY mechanic or any professional repair shop. Because we handle the complex programming, the physical installation is simple. This module is located in the left rear of the engine compartment on Express and Savana vans, and on the left front, under the battery, on Silverado and Sierra pickups. Once installed, you will only need to perform a simple security relearn procedure (often called a VATS relearn), which pairs the new ECM to your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require any special tools.
This module is a direct replacement for service numbers 12635043, 12639471, and 12653246, ensuring broad compatibility across several popular GM models.
Guaranteed Fitment For:
- ✔ 2010-2014 Chevrolet Express 1500 Van (with 4.3L V6 Engine)
- ✔ 2010-2014 GMC Savana 1500 Van (with 4.3L V6 Engine)
- ✔ 2010-2013 Chevrolet Silverado 1500 Pickup (with 4.3L V6 Engine)
- ✔ 2010-2013 GMC Sierra 1500 Pickup (with 4.3L V6 Engine)
Don’t let a faulty computer keep your reliable GM truck or van off the road. By choosing our pre-programmed Express 1500 Engine Module, you are getting a high-quality, reliable part that restores function and peace of mind. Get back to work and back to driving with confidence.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN at checkout, and we will flash the module with the latest GM software specific to your vehicle.
What is a security relearn procedure?
This is a simple, tool-free procedure that syncs the new ECM with your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, three times in a row. Instructions are readily available online for your specific model.
Where is my VIN located?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It is always recommended to have your vehicle properly diagnosed to confirm the ECM is the point of failure before ordering.
Is this compatible with other part numbers?
Yes, this ECM is a direct replacement for vehicles that originally came with service numbers 12635043, 12639471, or 12653246.