Jungheinrich Error Code 1901 · Safe & Trusted

The potentiometer or Hall effect sensor that measures pedal position is out of alignment, causing it to send a "pressed" signal even when it is not.

According to Jungheinrich's official operating manuals for various models, Error 1901 has a consistent and straightforward definition:

Activation of drive pedal when the parking brake is not released. Conclusion

Ensure your foot is completely off the forward and reverse accelerator pedals. Jungheinrich Error Code 1901

To break this down:

He watched the voltage on his multimeter. The CAN High and CAN Low lines were fluctuating, which was good—it meant data was moving. He wiggled the main bundle near the steering column. Suddenly, the dashboard flickered.

The unit will remain immobilized until the active signal at startup is cleared and the startup sequence is properly recycled. 4. Corrective Action Plan Step 1: Turn the truck completely off. The potentiometer or Hall effect sensor that measures

While it often points to a simple operational mistake, a persistent 1901 fault code indicates a mechanical malfunction, calibration drift, or an electrical issue within the pedal sensor mechanism. Root Causes of Error Code 1901

In simple terms: Error 1901 means the brain of the forklift cannot talk to the system that controls the wheels.

Jungheinrich forklifts are equipped with an advanced On-Board Diagnostic (OBD) system that generates error codes whenever a malfunction is detected. These five-digit codes provide precise information about problems related to traction, hydraulics, steering, or other functional areas. To break this down: He watched the voltage

If error 1901 appears after controller replacement, perform a "CAN bus reset" via the service menu (Code 5 – CAN Reset).

Once you have resolved the immediate error, implement these best practices to prevent recurrence: