Is Your 6.6L Duramax Workhorse Stumbling?
As a technician with over two decades of experience, I know that when your Sierra, Silverado, Express, or Savana van is down, your work stops. If you’re dealing with frustrating and intermittent issues on your 2013-2014 GM 6.6L Duramax, the Engine Control Module (ECM) is often the culprit. It’s the brain of your engine, and when it fails, it can cause a cascade of problems that are tough to diagnose.
Common Symptoms of a Failing 6.6L Duramax ECM:
- โ Complete no-start or cranks-but-won’t-start condition.
- โ Stalling, rough idling, or poor engine performance.
- โ Check Engine Light with communication-related trouble codes (U-codes).
- โ Erratic transmission shifting or limp mode activation.
- โ Issues with fuel injectors or other engine sensors not responding correctly.
A Reliable, Programmed Solution: Part Number 12653319
Don’t let a faulty computer keep your truck or van sidelined. This is a quality used, genuine GM Engine Control Module that offers a dependable and cost-effective repair. The best part? We take the guesswork out of the installation by pre-programming it specifically for your vehicle.
How Our VIN Programming Works for You:
Simply provide your vehicle’s 17-digit VIN during checkout. Our technicians will then use certified equipment to load the latest, most stable GM factory software and calibrations directly onto this module. This ensures it communicates perfectly with the other systems in your vehicle, right out of the box.
Expert Pro Tip from a 20-Year Tech
Before you plug in your replacement ECM, take 60 seconds to inspect the vehicle’s harness connectors. I’ve seen countless jobs where a perfectly good module was returned because of a bad connection. Use a bright flashlight and look for any green-colored corrosion or bent pins inside the plugs. A quick spray with a quality electronics cleaner and a gentle pass with a small pick or brush can save you hours of diagnostic headaches.
Important: Required Post-Installation Procedures
Getting your truck back on the road requires a few final steps after the new ECM is installed. These procedures are the responsibility of the installer and require a professional-grade scan tool with GM software capabilities (like a GM Tech 2 or access to TIS2Web). This is not optional; it’s a necessary part of the repair.
- Vehicle Theft Deterrent (VTD) Relearn: If the vehicle does not start after installation, the security system must be synchronized with the new ECM. This is the most common procedure you’ll need to perform.
- Crankshaft Position Variation (CASE) Relearn: This procedure calibrates the ECM to the precise position of the crankshaft, ensuring accurate misfire detection and smooth engine operation.
- Injector Flow Rate Programming: For optimal performance and fuel economy, the unique flow rate numbers printed on each injector must be programmed into the ECM.
Guaranteed Fitment for Your 2013-2014 Express 3500 ECM & More
This module is a direct replacement for the following vehicles equipped with the 6.6L Duramax diesel engine. Please verify your part number and application.
- 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
Note for Van Owners: This fits models with the ECM located in the LH rear engine compartment. For 2014 models, this is for vehicles without the ‘pull-ahead design’.
Part Number Compatibility
This ECM, service number 12653319, is also a direct replacement for service number 12654088. You will receive a fully compatible module programmed for your VIN.