P0720 - vehicle goes into failsafe mode when ac is turned on errorpo720

Question

I have changed tcm, output speed sensor, imput speed sensor , and transmission selonoid. van drives fine until I turn on ac , van goes into failsafe mode. any ideas

Answer 1

HI there,

This really indicates a wiring issue. If you have the P0720 then either there is an issue with the output shaft speed sensor wiring harness, the TCM or a problem with the internals on the transmission.