If you have access to a known-good used or spare drive controller (same part number), swap it in. Do not swap with a different part number – Jungheinrich controllers are programmed for specific truck models and weight classes.

Only a dealer or well-equipped technician can perform this step. Connect to the truck’s OBD-style diagnostic port.

A properly functioning CAN bus requires 120-ohm termination resistors at both ends of the network. If one resistor is missing, damaged, or has the wrong value, signal reflections cause "bit errors" that escalate into a full timeout (Error 1901).

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