Is Your 6.6L Duramax Stalling, Running Rough, or Refusing to Start?
If you’re dealing with frustrating engine problems in your 2013-2014 GM HD truck or van, a failing Engine Control Module (ECM) is a very common culprit. As a technician with over 20 years of experience, I’ve seen these exact symptoms hundreds of times. A faulty ECM can cause a cascade of issues, from random check engine lights and poor fuel mileage to a complete no-start condition that leaves you stranded. Don’t let a bad computer sideline your workhorse. This is the reliable, cost-effective solution you need.
The Direct Solution: VIN-Programmed & Ready for Your Vehicle
This is a genuine, road-tested used GM ECM that fits service numbers 12653319 and 12654088. The critical difference with our service is that we don’t just ship you a random part. Before it leaves our facility, we program it with the latest official GM calibrations specifically for your vehicle’s VIN. This ensures it communicates perfectly with the other modules in your truck, like the transmission controller and body control module, restoring the precise performance your vehicle had when it left the factory.
- โ VIN-Programmed for You: We load the correct software for your specific truck or van. Just provide your VIN at checkout.
- โ Fixes Common Issues: Solves problems like intermittent stalling, error codes, harsh shifting, and no-start conditions.
- โ Cost-Effective Repair: Get a dependable, programmed module for a fraction of the price of a new one from the dealer.
- โ Broad Compatibility: A direct fit for a wide range of 2013-2014 Sierra, Silverado, Express, and Savana models with the 6.6L Duramax engine.
Expert Pro Tip from a 20-Year Veteran
Before you install this replacement ECM, take a moment to closely inspect the main harness connectors. Over time, the connector pins can develop a thin layer of corrosion or even get slightly bent during a previous repair. I’ve seen cases where a perfectly good module was blamed for issues caused by a poor connection. Use a quality electronics cleaner and a small pick or brush to ensure every pin is clean and straight. This five-minute check can save you hours of diagnostic headaches.
Simple Installation Process
Replacing the ECM on these trucks is straightforward. While professional installation is always an option, many of our customers are DIYers who can handle the job in their own driveway.
- Safety First: Always disconnect the negative battery terminal and wait 10-15 minutes for the system capacitors to discharge.
- Locate the ECM: On Sierra and Silverado pickups, it’s typically found in the front, left-hand (driver’s side) of the engine compartment. On Express and Savana vans, it’s in the left-hand rear of the engine bay.
- Disconnect & Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the old module from its mounting bracket.
- Install the New ECM: Bolt your new, programmed ECM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
Important Note on Security & Setup Procedures
Because this module is new to your vehicle, a Vehicle Theft Deterrent (VTD) relearn may be required for the engine to start. This is a standard security procedure that pairs the ECM to your truck’s anti-theft system. In most cases, this requires a tool with access to GM’s TIS2Web programming service. Additionally, other procedures like a Crankshaft Position Variation Relearn or Injector Flow Rate programming may be necessary to achieve optimal performance. These relearn procedures are the responsibility of the installer.
Is This the Right Part for Your 2013-2014 Sierra 3500 ECM?
This module is the correct fit for the following vehicles equipped with the 6.6L Duramax Diesel engine. Please match your vehicle and part number (12653319 or 12654088) to ensure compatibility.
- 2013-2014 Chevrolet Silverado 2500/3500
- 2013-2014 GMC Sierra 2500/3500 (including Denali)
- 2013-2014 Chevrolet Express 2500/3500 Van
- 2013-2014 GMC Savana 2500/3500 Van
Stop guessing and start fixing. Get your truck back to full strength with an ECM that’s programmed and ready to work as hard as you do. Order yours today!