Allison 6sp: P0847 when wet...

M.A.M.

Member
Jan 9, 2016
429
7
18
Ohio
Got a 2011 with 550k on the clock. Replaced the TCM a little over half a year ago... recently whenever it rains and the road’s wet I’m getting a P0847. “Transmission fluid pressure sensor/switch B circuit low voltage”. Any tips on where exactly to check wiring for this sensor, or any other suggestions?


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