🚚 We Ship Worldwide
👍 Lifetime Warranty
✅ 100% Tested & Programmed OEM Replacement

2017-2021 Chevrolet Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD, Chevrolet Express 2500/3500 & GMC Savana 2500/3500 6.6L Duramax L5P ECM Replacement Module

This 2017-2021 Chevrolet Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD, Chevrolet Express 2500/3500, and GMC Savana 2500/3500 6.6L Duramax L5P ECM is a high-quality, direct-fit remanufactured replacement module engineered to restore dependable engine performance and vehicle operation. It is professionally programmed to your vehicle's VIN for a straightforward Plug & Play installation.

Each unit is individually inspected, professionally remanufactured, programmed, and quality-control tested by experienced technicians before shipment. No unit leaves our facility without passing a complete diagnostic process.

Compatible OEM part number: 12686363.

📦 WHAT'S INCLUDED

✓ 1x 2017-2021 Duramax 6.6L L5P Engine Control Module (ECM)
✓ VIN programming for your exact vehicle
✓ Latest OEM software updates installed when applicable

🚘 COMPATIBILITY

Years: 2017-2021
Make: Chevrolet / GMC
Models: Silverado 2500HD, Silverado 3500HD, Express 2500, Express 3500, Sierra 2500HD, Sierra 3500HD, Savana 2500, Savana 3500
Engine: 6.6L Duramax Diesel (L5P)
Selected Part Number: 12686363
Part Type: Engine Control Module (ECM)

⭐ WHY CHOOSE US?

✓ VIN programmed for your exact vehicle — Plug & Play installation*
✓ Premium remanufactured OEM-quality unit, thoroughly tested by experienced technicians
✓ Lifetime Warranty
✓ Fast worldwide shipping after VIN confirmation
✓ Latest OEM software updates included when applicable
✓ 150+ verified 5-star reviews

🔔 Important – VIN Required

To ensure proper programming of your ECM before shipment, we require your Vehicle Identification Number (VIN). Please provide it during checkout in the designated field. If unavailable at checkout, you may send it later via email at sales@autocomputerusa.com, call (305) 456-9505, or text/WhatsApp us at 786-269-4099.

⚠️ COMMON SYMPTOMS

● No-start or hard starting conditions
● Check Engine Light or stored ECM fault codes
● Reduced engine power or limp mode operation
● Poor fuel economy
● Injector control or fuel system communication issues
● Loss of engine performance or throttle response
● Communication faults with other vehicle modules
● Intermittent stalling or drivability concerns

🚚 SHIPPING

We offer fast worldwide shipping. Your ECM is securely packaged and shipped after VIN confirmation and programming.

🔄 RETURNS

Returns are accepted within the stated return window if the item is unused and in its original condition. A restocking fee may apply.

👍 WARRANTY

This unit comes with a Lifetime Warranty for long-term peace of mind.

*Plug & Play installation applies when the provided VIN is accurate and programming is completed before shipment.