Is Your GM Truck or Van Suddenly Unreliable?
You rely on your 2009-2010 Sierra 3500 to get the job done. But when the very brain of your engine starts to fail, everything grinds to a halt. Are you experiencing baffling issues like random stalling, a persistent check engine light that won’t go away, harsh shifting, or a complete no-start condition? These aren’t just annoyances; they’re signs that your Engine Control Module (ECM) may be failing. In my 20+ years in the shop, I’ve seen countless work trucks sidelined by a faulty ECM, costing owners time and money they can’t afford to lose.
Don’t let a bad computer dictate your schedule. This is a direct-fit replacement Engine Control Module, part number 12625455 (also compatible with 12629009), designed to restore your vehicle’s performance and reliability. The best part? We eliminate the most frustrating step of the repair: the expensive trip to the dealership for programming.
The Smart Solution: Pre-Programmed for Your Vehicle
Before we ship this module, our technicians will flash it with the latest GM-certified software, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once it arrives, it’s ready to install and communicate perfectly with your truck’s systems. This isn’t a generic, one-size-fits-all solution; it’s a tailored repair that gets you back on the road faster.
- ✔ VIN-Programmed for You: We handle the complex programming so you don’t have to. Just provide your VIN at checkout.
- ✔ Fixes Common Failures: A direct solution for issues like no-start, stalling, communication errors, and false sensor codes.
- ✔ Restores Performance: Regain the smooth idle, crisp throttle response, and proper transmission shifting you expect.
- ✔ Broad GM Compatibility: This versatile ECM is the correct part for a wide range of GM trucks, vans, and SUVs from 2009-2010.
Expert Pro Tip: Check for External Causes
Before installing your new ECM, take a moment to inspect the wiring harness connectors for any signs of corrosion, moisture, or bent pins. A common cause of ECM failure on these GM trucks is a short in a sensor or actuator, like an ignition coil or fuel injector. A quick check can prevent the same issue from damaging your replacement module. A little prevention goes a long way in ensuring a long-lasting repair.
Easy Installation for the DIYer or Professional
Replacing the 2009-2010 Sierra 3500 Engine Computer is a straightforward process that can be done with basic hand tools. While the exact location varies slightly by model, it’s typically found in the engine bay. Once installed, you may need to perform a security relearn procedure, which is a simple process that can be done without special tools.
- Safety First: Disconnect the negative battery terminal and wait 10 minutes for the system to discharge.
- Locate the ECM: On most Sierra/Silverado models, it’s on the driver’s side of the engine compartment, near the firewall or fender.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module.
- Remove Old ECM: Unbolt the old ECM from its mounting bracket.
- Install New ECM: Mount the new, pre-programmed module, reconnect the wiring harnesses securely, and reconnect the battery.
- Perform Security Relearn: If the vehicle doesn’t start, a simple key-cycle relearn is typically all that’s needed to sync the new ECM with your vehicle’s anti-theft system.
Guaranteed Fitment for Your GM Vehicle
This ECM, part number 12625455 or 12629009, is the correct replacement for a wide array of vehicles. Please verify your model and options below to ensure compatibility. If you’re unsure, just send us a message with your VIN, and we’ll confirm the fitment for you.
This is the solution you need to get your truck, van, or SUV running right again. By providing a reliable, pre-programmed 2009-2010 Sierra 3500 Engine Computer, we take the guesswork and dealer hassle out of the equation. Order today and restore your vehicle’s core functionality.