The vast majority of Error 1901 occurrences are simply due to the operator's foot resting on the accelerator pedal while turning the key or pressing the start button. Alternatively, a floor mat or debris could be pressing against the pedal without the operator noticing.
Reconnect the sensor. Turn on the key (traction active). Measure DC voltage between the two sensor wires at the controller side:
Ensure the metal casing of the controller is securely grounded to the forklift chassis.
Follow these steps in order. In most cases, the solution is simple and will require only a few seconds. Jungheinrich Error Code 1901
: Loose connections or damaged wire harnesses between the pedal and the controller can cause signal discrepancies.
Electric forklifts require highly stable voltage to process logic commands. If a battery cell is dying, or if the main battery plug has high resistance due to burning or corrosion, the voltage supplied to the controller can drop sharply under load. This sudden voltage dip confuses the logic processor, resulting in an internal controller error. 3. Faulty or Corrupted Controller Hardware
Understanding and Troubleshooting Jungheinrich Error Code 1901 The vast majority of Error 1901 occurrences are
To minimize the occurrence of Error Code 1901 and other issues:
Jungheinrich forklifts are renowned for their reliability and advanced engineering, but like any sophisticated machinery, they can encounter error codes that halt operations. One common error code operators might encounter is , which is often referred to simply as the 1901 code in the field.
This guide is for informational and basic troubleshooting purposes only. It is not a substitute for the official Jungheinrich service manual for your specific model. Always refer to the manufacturer's documentation and follow all safety procedures. For persistent issues or if you are unsure of any step, contact a certified Jungheinrich service professional. Turn on the key (traction active)
A short circuit or mechanical failure in the pedal position sensor or microswitch, signaling that the pedal is depressed when it is not.
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If the physical pedal is fine, the sensor might be sending a false signal.
