I went through one of those touch free car washes a while ago . It has jets that wash the underside of the car as you drive in. In doing v that the HDC and suspension light came on. Checked out the wiring to the height sensor on the right rear corner (as this was the side i had a blow out the week before ) and found the wiring insulation broken exposing the copper repaired wiring and all ok. So might pay to check all sensor wiring . Dont know if it will help with your trans problem. Do you have a diagnostic tool ?
Pas.
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