Is Your Work Van or Truck Suddenly Unreliable?
As a technician with over two decades of experience under the hood, I’ve seen it all. A Chevrolet Express or GMC Savana van that used to be the backbone of your business suddenly starts stalling, getting terrible gas mileage, or just won’t start at all. You see that dreaded Check Engine Light, and your scanner is throwing a dozen confusing codes. Often, the root cause isn’t a bad sensor or a faulty fuel pumpโit’s the brain of the operation, the Engine Control Module (ECM), that has failed. When the ECM goes, it can create phantom issues that lead you down a rabbit hole of expensive and unnecessary repairs.
The Direct Solution: A VIN-Programmed Engine Computer
This isn’t just a replacement part; it’s a complete solution. We are offering a genuine GM Engine Control Module, service part number 12635043, that arrives at your doorstep pre-programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This critical programming step means you can bypass the dealership entirely, saving you hundreds of dollars in programming fees and valuable time your vehicle would otherwise spend in the shop.
Common Symptoms of a Failing 4.3L V6 ECM:
- โ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- โ Engine cranks but refuses to start.
- โ Rough idling, stalling, or hesitation during acceleration.
- โ Noticeable decrease in fuel economy.
- โ Transmission shifting issues or harsh shifts.
- โ Intermittent electrical problems that seem to have no source.
From My Shop to Your Driveway: A Real-World Scenario
“A customer’s ’12 Silverado 1500 with the 4.3L came in last week with a random misfire and a no-start condition that would come and go. He had already replaced the spark plugs, wires, and even the ignition coil pack. The problem persisted. After hooking up my diagnostic scanner, I noticed the injector pulse width was erratic. Instead of chasing ghosts, I went straight to the source. We tested the driver circuits within the original ECM and found they were failing intermittently. A new, properly programmed ECM fixed the issue instantly. This is a classic case where the ECM itself is the culprit, not the parts it controls.”
Why Choose Our 2010-2014 Express 1500 ECM?
Getting the right part is only half the battle; getting it programmed correctly is what makes the repair successful. We handle the complex part for you. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our experts will flash the module. When it arrives, it’s ready for a straightforward installation. This is the most efficient way to restore your vehicle’s performance and reliability.
Simple Installation Guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work.
- Locate the ECM: On the Express/Savana vans, it’s in the left-hand rear of the engine compartment. On Silverado/Sierra pickups, it’s on the left-hand front, typically under or near the battery tray.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old ECM. Inspect the pins for any corrosion or damage. Clean them with electrical contact cleaner if necessary.
- Remove Old Module: Unbolt the old ECM from its mounting bracket.
- Install New Module: Bolt the new, pre-programmed ECM into place.
- Reconnect Everything: Securely plug the wiring harnesses into the new module until they click. Reconnect the negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary, which can typically be done without special tools. Instructions are widely available online for your specific model.
Guaranteed Fitment & Compatibility
This module is a direct replacement for service numbers 12635043, 12639471, and 12653246. It is compatible with the following vehicles equipped with the 4.3L V6 engine:
- 2010-2014 Chevrolet Express 1500 Van
- 2010-2014 GMC Savana 1500 Van
- 2010-2013 Chevrolet Silverado 1500 Pickup
- 2010-2013 GMC Sierra 1500 Pickup
Don’t let a faulty computer keep your truck or van off the road. Order this pre-programmed 2010-2014 Express 1500 ECM and get your vehicle running right again.