A script for reading and writing TCM T87A gearboxes for GM vehicles. These transmission control units are used on 6-speed, 8-speed and 10-speed transmissions from 2015-2020:
Supported GM vehicles with 6-speed transmission and T87A TCM:
- 2015-2016 GM 2500HD/3500HD (6.6L LML)
- 2017-2019 GM 2500HD/3500HD (6.6L L5P)
Supported GM vehicles with 8-speed transmission and T87A TCM:
- 2017-2019 Chevrolet Silverado
- 2017-2019 Chevrolet Colorado
- 2017-2019 Chevrolet Corvette
- 2017-2019 Chevrolet Camaro
- 2017-2019 Cadillac Escalade and Escalade ESV
- 2017-2019 Cadillac ATS, ATS-V, CTS, CT6, and CTS-V
- 2017-2019 GMC Sierra, Yukon, Yukon XL, and Yukon Denali XL
- 2017-2020 Chevrolet Suburban
- 2017-2020 Chevrolet Tahoe
- 2017-2019 GMC Canyon
Supported GM vehicles with 10-speed transmission and T87A TCM:
- 2017-2018 Chevrolet Silverado 1500
- 2017-2018 GMC Sierra 1500
- 2017-2019 Chevrolet Colorado
- 2017-2019 Chevrolet Corvette
- 2017-2019 Chevrolet Camaro
- 2017-2019 Cadillac Escalade and Escalade ESV
- 2017-2019 Cadillac ATS, ATS-V, CTS and CTS-V
- 2017-2020 GMC Yukon, Yukon XL, Yukon Denali and Yukon Denali XL
- 2017-2020 Chevrolet Suburban
- 2017-2020 Chevrolet Tahoe
- 2017-2019 GMC Canyon
- 2018–2020 Cadillac Escalade
The script supports reading FULL FLASH and writing FULL FLASH (skipping the bootloader area) on the bench with a direct connection to the ECU connector.
The script also supports checking the correctness of the read and written data (that is, write whatever you want to the block, but after reading or writing, the script will check itself for the correctness of reading and writing data).
The script does not recalculate the Checksum.
To work with the script you will need a 44pin adapter or DB44 connector and an MCP2515 board and a 12V power supply that connects to the IPROGPRO programmer. There is a photo of the connection in the script.
