2009–2015 Chevrolet Silverado GMC Sierra Allison T14/A50 TCM 24256861

Remanufactured Transmission Control Module

This listing is for a professionally remanufactured Allison T14/A50 6-speed Transmission Control Module (TCM) for select 2009–2015 Chevrolet Silverado and GMC Sierra 2500/3500 trucks equipped with a 6.6L Duramax diesel engine.

Each module is inspected, remanufactured, and tested before shipping.

Vehicle Fitment

• 2009–2015 Chevrolet Silverado 2500

• 2009–2015 Chevrolet Silverado 3500

• 2009–2015 GMC Sierra 2500

• 2009–2015 GMC Sierra 3500

• Select 6.6L Duramax diesel applications

• Allison 6-speed automatic transmission

• T14/A50 Transmission Control Module

Fitment may vary by model year, vehicle configuration, transmission, and production date. Match your original module’s part number before ordering.

Compatible Part Number

• 24256861

Your original TCM part number must match 24256861. Compatibility cannot be confirmed using only the vehicle’s year, make, model, engine, or transmission.

Contact us before ordering if the original part number is missing, unreadable, or does not match.

Important Module Identification

Part number 24256861 is identified as a T14/A50 module. Do not order it as a replacement for an A40 module unless the original part number and module identification have been confirmed as compatible.

What You Will Receive

• One remanufactured Allison T14/A50 TCM

• Part number 24256861

• Module inspection and testing before shipment

• Installation-ready replacement module

Common TCM Failure Symptoms

A failing Transmission Control Module may be associated with:

• Check Engine light illuminated

• Transmission warning message

• Harsh, delayed, or erratic shifting

• Transmission remaining in one gear or fail-safe mode

• Delayed engagement into Drive or Reverse

• Loss of communication with the TCM

• Inter