Ivanlinaric;
The truck's management system (Hytachi) is picking up a short in the Drive's transistor POWER circuit. Look closely at current leakage from the battery. Ck current sensor (only measure voltage) and when you check controller elements, also ck the associated harnesses and bus bars. To check the RH & LH field effect transistor boards will require a tear down to check each board which is a 9 FET element construction. Sorry I didn't get back to you sooner I just noticed your post.
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