Jungheinrich Error Code 1901

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

If all wiring checks out and the battery is healthy, the fault likely lies in the Vehicle Controller itself. Replacing a main controller on a Jungheinrich truck usually requires a dealer-level service laptop (Jungheinrich ProBot or similar) to program the new controller to the truck's specific parameters. This is typically not a DIY repair.

If the internal resistance of the pedal sensor is outside of the expected range, the controller will throw 1901 as a safety precaution to prevent the truck from jumping forward unexpectedly. Summary Table Resolution Pedal pressed during startup Restart with feet off the floor. Obstruction under pedal Clean area around the pedal base. Sensor/Magnet gap too wide Check for mechanical "play" or wobbling . Calibration drift Professional recalibration via service software .

If this resolves the error, the issue was simply an operator oversight. No further action is needed. Jungheinrich Error Code 1901

Jungheinrich Error Code 1901 is an that appears during the truck's startup sequence. Its official meaning is "Accelerator pedal pressed during power-up" . It may also be displayed as E-1901 or 1901.1 on the control panel, which provides further detail on the specific sub-index of the event.

If you have completed both Step 1 and Step 2 and the 1901 error code continues to appear, it is time to contact a qualified service technician.

The drive controller itself (often branded ZAPI, Curtis, or Jungheinrich house-branded) can develop internal faults: Activation of drive pedal when the parking brake

In rarer cases, the problem lies not with the pedal but with the controller reading it. A failure of the +5V reference voltage supply from the controller to the sensor or a damaged analog-to-digital (A/D) converter input on the controller board can produce an incorrect "pedal pressed" signal.

The VDI controller, sensing silence, triggered the timeout and slapped the 1901 code on the screen to protect the driver.

drive pedal was activated during the truck's startup sequence This is typically not a DIY repair

The accelerator pedal’s microswitch or potentiometer is damaged, misaligned, or sending a false electrical signal to the controller. Step-by-Step Troubleshooting Guide

: Specifically refers to drive pedal activation during the initial startup sequence.

: Ensure your foot is completely off the drive pedal before turning the key or starting the truck. Restart the Vehicle

If you are dealing with a persistent 1901 code despite a clean pedal mechanism, you may need a system reset. Would you like to know the specific to access the service menu for your specific Jungheinrich model, or do you need help identifying the part numbers for a replacement travel sensor? Share public link

The controller detects input from the pedal, prevents startup, and displays "1901.1" on the screen. Common Causes of 1901.1