Jungheinrich Error Code 1901 ((install)) (1080p 2K)

If the forklift key switch or dead-man switch vibrates excessively or suffers from worn internal contacts, it can momentarily break the connection to the controller's wake-up terminal. This causes a partial shutdown sequence while the truck is active, triggering a logic conflict. Step-by-Step Diagnostic Protocol

Error 1901 is rarely the only code an operator sees. It often appears alongside other informational messages, as these codes share a common theme: operator input at startup. Recognizing these related codes can provide a more complete picture of the issue.

Look underneath and around the accelerator pedal for debris like stretch wrap, wood splinters, or dirt buildup.

Summary

This code is part of the "operator error" or "standard event" category (specifically codes ranging from 1 to 50 in some systems). It is triggered by a safety feature designed to prevent the truck from moving unexpectedly as soon as it is switched on.

Damage, corrosion, or a short circuit in the wiring harness between the pedal assembly and the controller.

This article provides a complete guide to understanding what Error Code 1901 means, why it appears, and the step-by-step process to resolve it quickly and safely. Jungheinrich Error Code 1901

Activation of drive pedal when the parking brake is not released. When to Call a Technician

A damaged wire or faulty connector in the pedal circuit is signaling a voltage change, mimicking a pressed pedal. Troubleshooting and Resolving Error 1901.1 Follow these steps in order to clear the code. 1. Instant Checks

| Code | Meaning | Recommended Action | | :--- | :--- | :--- | | | No travel direction selected when accelerator pedal applied. | Before pressing the accelerator, ensure you have selected Forward or Reverse with the travel switch. | | 1908 | Seat switch not closed; truck operational but driver's seat not occupied. | The forklift may operate but at a reduced speed. Ensure you are properly seated so the switch is activated. The truck will not move if you are not in the seat. | | 1909 | Accelerator pressed while parking brake applied. | Release the parking brake before pressing the accelerator pedal. | | 1917 | Accelerator pedal and brake pedal pressed simultaneously. | Avoid pressing both pedals at the same time. Use only the appropriate pedal for your intended action. | | 2951 | Hydraulic function applied during power-up. | At startup, ensure no hydraulic levers (e.g., lift/lower/tilt controls) are being activated. | If the forklift key switch or dead-man switch

Teach drivers to power on the machine with both feet flat on the floorboard.

: Dust, debris, or a broken return spring holding the pedal slightly down.

– this will not clear stored codes on Jungheinrich trucks made after 2012. The EEPROM retains faults. It often appears alongside other informational messages, as