According to my experience - you may have the problem with the tiller PC Board or the tiny microswitches on it.
But first, i'ld check the the white plastic pieces (axle, tooth wheels, spring, etc) which are inside the tiller head. They "transfer" the traction control from the acceleration "wings" to the electronics.
50% of traction problems in these trucks are caused by the wear or defect of these small plastics. You can buy them as a repair kit.
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