U0101 LOST COMMUNICATION WITH TRANSMISSION CONTROL MODULE (TCM) - A REPAIR GUIDE

Repairing GM TCM Module 24257038 for Allison transmission. A common issue with these modules are heat related. When the module is cold, the transmission shifts properly, but as soon as it gets hot, it stops shifting and throws an error code. It is believed this is because of cracking solder balls on the BGA microcontroller. Currently, this module is och national backorder and this is due to a supplyer issue of core parts inside the unit. Desoldering the microcontroller from the pcb presents mult