Code P1780 Transmission Control Switch (TCS) not cycled during the self-test. So, there is a g37 ground wire that needs to be checked which is at the lower left side of the dash on the car cross beam. Also, please check the fuse # f27, f5 in the under-hood fuse panel and fuse # f67 and f80 in the interior fuse panel left front of the passenger's compartment. Here is a guide to help you. Also, I have included the transmission wiring diagrams as well so you can see how the system works.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
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Thursday, December 1st, 2022 AT 4:09 PM