24256861 | GM Allison 1000 Transmission Control Module (TCM)
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Warranty
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Product Description
| Product Name | Transmission Control Module | Product Name Transmission Control Module |
| Condition | Remanufactured | Condition Remanufactured |
| Brand | General Motors | Brand General Motors |
| Catalog Part Number | 24256861 | Catalog Part Number 24256861 |
| Superseded By | 19435614 | Superseded By 19435614 |
| Module reference | T14 / A50 — application verification required | Module reference T14 / A50 — application verification required |
| Application | Selected Chevrolet Silverado and GMC Sierra configurations; confirm VIN and original module before ordering | Application Selected Chevrolet Silverado and GMC Sierra configurations; confirm VIN and original module before ordering |
| Programming | Programming and setup required | Programming Programming and setup required |
| Listed Weight | 5 lb | Listed Weight 5 lb |
Useful Information
Description and Purpose
This genuine GM remanufactured transmission control module (TCM), listed under catalog reference 24256861, is an electronic transmission controller for selected Chevrolet Silverado and GMC Sierra applications equipped with the Allison 1000 / LCT1000 six-speed automatic transmission. It manages transmission operation and shift control.
Application and Installation
Confirm the vehicle's VIN, model year, transmission configuration and original module identification before ordering. Silverado or Sierra model names, Duramax engine identification, or an Allison 1000 transmission alone do not establish compatibility. This listing does not claim universal fitment across every Allison 1000 application.
Programming and setup are required before use. This module is not advertised as plug-and-play. Arrange the correct vehicle-specific programming and installation with a qualified repair shop or dealer.
GMPartsGiant lists 19435614 as the service replacement for 24256861. This supersession does not establish unrestricted interchangeability in the reverse direction. See the dedicated Related Parts Number section for related catalog references.
Product Information
Condition: Remanufactured. Brand: General Motors. This listing uses the specifications and Parts Finder Q photographs from the corresponding service-replacement module. The photos show the replacement module, not a separate guarantee of the number printed on the unit supplied.
Warranty
A 365-day Parts Finder Q warranty applies to purchases made directly through partsfinderq.com. Warranty terms, coverage limits and exclusions apply.
Product Questions & Answers
Which transmission is part 24256861 associated with?
It is associated with the Allison 1000 / LCT1000 transmission family, including six-speed applications in selected Chevrolet Silverado and GMC Sierra trucks. Match the original module identification and confirm the VIN and transmission configuration before ordering.
Does this transmission control module need programming?
Yes. Programming and setup are required for the vehicle before use. Do not assume it is preprogrammed or plug-and-play; discuss the required procedure with the installer.
Will it fit my Duramax Silverado or Sierra?
The engine name or HD model designation alone is not enough to confirm fitment. Provide the VIN, model year, transmission information and part number from the original module so the application can be checked before purchase.
Can a GM T14 module replace every Allison A50 TCM?
No. T14 and A50 are not universally interchangeable. Allison specifically identifies GMT560 medium-duty trucks and Workhorse chassis using the GM powertrain as applications where a GM T14 is not a suitable replacement for the original A50 module. Confirm the exact original module and application rather than ordering by T14 or A50 alone.
How much does transmission control module replacement cost?
Refer to the current product price for this module. The total replacement cost also depends on the vehicle and the installation and programming required. Ask your repair shop or dealer for a separate estimate; do not assume those services are included in the displayed product price.
