1901 - Jungheinrich Error Code

Even if a pedal obstruction is cleared, the system might need a full reset.

Use diagnostic software to reset the pedal sensor's dead-zone parameters. This teaches the controller the exact voltage of the neutral position. Summary of Diagnostic Parameters Variable Component Typical Behavior / Cause Required Corrective Action Operator Behavior Foot resting on pedal during key-on. Release pedal and restart truck. Pedal Mechanics Broken spring or jammed debris. Clean assembly or replace spring. Harness / Plug Short-to-ground or high contact resistance. Repair wiring and clean connectors. Pedal Potentiometer Voltage out of range at neutral. Calibrate via software or replace sensor. Preventive Maintenance Tips Jungheinrich Error Code 1901

If this resolves the error, the issue was simply an operator oversight. No further action is needed. Even if a pedal obstruction is cleared, the

This error is a direct result of a built-in safety feature found in Jungheinrich controllers. Before the truck enables drive functionality, it performs a "Power-On Self-Test" (POST). During this test, the system checks the sensor reading from the accelerator pedal to ensure it is in a safe "zero" or neutral position before it can send power to the drive motor. If the pedal's voltage reading is outside a pre-defined safe window (e.g., 0.4–0.8 volts) during POST, the system is prevented from engaging, and the truck will not operate. This mechanism prevents unintended and potentially dangerous sudden movements at start-up. Clean assembly or replace spring