That's wot my local lr specialist said too. Had just serviced the box only 600 miles before this started. And have since had it out an cleaned and put a new torque converter in. Still the same.

Hi. Sorry to steal your thread but I have these exact issues. On an 04 3.0 d with gm box and 135k miles. Drives perfect 1-4 then soon as it hits 5 it goes intolerant fail safe. When I'm on the diagnostics in the gearbox ecu it reads a low voltage but on the air or engine ecu it reads fine...