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When battery voltage drops below 18V (on a 24V system) during a high-demand steering maneuver, the sensor’s supply voltage dips momentarily. The control unit interprets this as a sensor failure, storing Error 1901.
Ensure your foot is completely off the drive pedal before switching on the truck. Turn the truck off and back on again with the pedal in the neutral position to reset the code Machine Maxx USA Obstructions: Jungheinrich Error Code 1901
Inspect the pedal return spring. If it is broken or weak, the pedal will not return to neutral, triggering the code at startup. When battery voltage drops below 18V (on a
: Most often, simply releasing the pedal and restarting the truck (cycling the key switch) will clear the error if it was caused by operator error. Troubleshooting Steps Turn the truck off and back on again
Drive pedal activated but no direction (Forward/Reverse) selected.