Code P1780, gearbox fault?

MELANCON AUTOMOTIVE

MEMBER
2002 JAGUAR X-TYPE
V6
4WD
AUTOMATIC
125,707 MILES

I recently got a gearbox fault on the dash, and I have an Autel scanner, so I scanned vehicle and I'm getting a p1780 code. I just changed the whole shifter out and still getting code. What could it be?

Wednesday, November 30th, 2022 AT 1:21 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

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

Check out the images (below). Please let us know what you find. We are interested to see what it is.

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Code P1780, gearbox fault?

1 Reply

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