25978353 | Genuine Allison® 6-Speed TCM Transmission Control Module T14, A50

SKU: 25978353 MPN: 25978353

Empower your powertrain with the Genuine Allison 6-Speed TCM, crafted for precision electronic shifting. Part number: 25978353. Fits Chevrolet Silverado and GMC Sierra featuring 6.0L and 6.6L engines for stable on-road performance.

$959.00
No Core Charge
3 in stock

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Contact us to check if overnight next-day delivery is available for your order - PN: 25978353

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Product Description

Product Name 6-Speed Transmission Control Module Product Name 6-Speed Transmission Control Module
Condition Remanufactured Condition Remanufactured
Brand Allison® Brand Allison®
Part Number 25978353 Part Number 25978353
Vehicle Compatibility
Chevrolet Silverado (2009-2015) Chevrolet Silverado (2009-2015)
GMC Sierra (2009-2015) GMC Sierra (2009-2015)
Engine Compatibility
Engine 8 Cyl 6.0L Engine 8 Cyl 6.0L
Engine 8 Cyl 6.6L Engine 8 Cyl 6.6L
Module Compatibility
Model T14, A50 Model T14, A50
Common Diagnostic Trouble Codes
U0101 Lost communication with TCM U0101 Lost communication with TCM
U0100 Lost communication with ECM/PCM U0100 Lost communication with ECM/PCM
P2669 Computer circuit malfunction / Actuator Supply Voltage "B" Circuit Low P2669 Computer circuit malfunction / Actuator Supply Voltage "B" Circuit Low
P0700 Transmission Control System fault P0700 Transmission Control System fault
P0827 Up and Down Shift Switch Circuit Low P0827 Up and Down Shift Switch Circuit Low
TCM Not powering on / No communication TCM Not powering on / No communication

Useful Information

Description and Purpose:

This Genuine Allison 6-Speed (TCM) Transmission Control Module, carrying Part number: 25978353, is a remanufactured electronic module designed for Silverado 2500/3500 HD and Sierra 2500/3500 HD models built between 2009 and 2015. It manages the T14 and A50 transmission systems, allowing smooth transition between gears and maintaining the correct torque delivery for 6.0L and 6.6L engines.

Why Replacement is Important:

A damaged or outdated TCM can cause delayed shifts and reduce transmission performance. Installing a reliable unit prevents long-term mechanical stress.

Impact on Vehicle Performance:

Restores seamless gear changes, steadies acceleration, and ensures responsive control during hauling or heavy use.

Manufacturer Information:

Allison® produces components that reflect decades of engineering expertise and proven automotive technology.

Tags & Category: Transmission Control Module, 6-Speed TCM, GM T14 A50, Automatic Transmission Module, Powertrain Control Unit, 6L90 TCM, Chevrolet Silverado Transmission Module, GMC Sierra Transmission Controller, OEM GM TCM, Shift Control Unit, Electronic Transmission ECU

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.

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  • Icon Truck, Fast Delivery
    Free shipping over $199 Place an order today and receive it on Mar 6
  • Clock Icon
    Orders placed before 7-PM EST will ship same business day
  • Location icon, warehouse pickup point.
    Pickup available usually ready in 24 hours
  • Need it fast? We offer overnight shipping

    Contact us to check if overnight next-day delivery is available for your order - PN: 25978353