Programmed T42 Transmission Control Module

The Programmed GM T42 Transmission Control Module (TCM) is a refurbished, VIN-programmed unit designed to resolve common transmission control issues. This module is a direct replacement for part number 24256960 and is ready for installation, eliminating the need for costly and time-consuming trips to the dealership for programming. It is programmed with the latest GM software updates to ensure smoother, more accurate shifting and proper torque converter lockup, enhancing both drivability and fuel efficiency. Symptoms of a failing TCM can include harsh or delayed gear shifts, the vehicle being stuck in limp mode, illuminated check engine or transmission warning lights, and diagnostic trouble codes such as P0700 or P0750. Installing this pre-programmed module directly addresses these electronic failures, restoring precise communication between the engine and transmission. The unit is built to meet strict OEM specifications for reliability and is backed by a one-year warranty against manufacturing defects, electrical failures, and programming issues. Installation of this TCM is typically straightforward for most models, usually involving disconnecting the battery, unplugging the old module, swapping the hardware, and reconnecting everything. Most DIY mechanics with basic tools can complete the job in under an hour. The module is compatible with a range of service numbers, including 24252114, 24234503, 24230461, and 24256960, fitting numerous GM models. Specific fitment includes Buick Allure from 2006-2009 with 3.6L, 3.8L, or 5.3L engines.