yep check the toss and tiss sensors
but the description of the code says toss/tiss special conditions
transmission output speed not proportional to the transmission input speed.
smell something burning?
check the brakes to see if they are dragging also
make sure the park brake is adjusted right and not dragging
then check the inching system and make sure the transmission is fully engaging when the brake pedal is released.
wheels getting extremely hot?
transmission getting unusually hot?
just for starters....
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