Medium and Heavy Trucks
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Hi Ben sorry for delay.
This fault most times is caused by poor battery supply power to trans controller, start with cleaning all battery connections and inline fuse in battery box.
Click here for t/r manual, go to page 146 to troubleshoot fault
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Pay close attention for corrosion in fuse holder and eyelet connection from fuse holder to battery power in battery box, they are common issues with this fault, any corrosion can reduce power to controller causing fault.