, where the truck's main controller cannot "see" or communicate with a critical component.

The contactor tips may be welded together or mechanically jammed in the "ON" position. Wiring Faults:

Jungheinrich controllers require the two pedal signals to track each other within ~0.2V. Slowly depress the pedal while watching both voltages.

: Disconnect components on the CAN-Bus network one by one and cycle the key to see if the error changes, which can help pinpoint the failing module.

If you want, I can provide a concise step checklist tailored to your specific Jungheinrich model and serial number — tell me the model and serial.