If the sensor is fine, the controller may be getting a bad signal due to wiring issues. Check for frayed or disconnected wires around the pedal assembly. When to Call a Technician
Set your multimeter to DC Volts.
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. Jungheinrich Error Code 1901
Did the error clear after , or is the code appearing while you're already driving? Jungheinrich Forklift Error Codes - Machine Maxx USA If the sensor is fine, the controller may
The machine fails to move when the throttle is engaged.The display alternates between the hour meter and the 1901 code.The lift and lower functions may be disabled.The error may be intermittent, occurring only when the tiller is moved to specific angles. Step-by-Step Troubleshooting Checklist If you have completed both Step 1 and
When Error Code 1901 appears, the truck usually enters a safety shutdown or limp mode, disabling travel and hydraulic functions to prevent mechanical damage or operator injury. Understanding the root causes of this error allows fleet managers and maintenance technicians to diagnose the issue quickly and minimize operational downtime. Primary Causes of Jungheinrich Error Code 1901
: Check the harness connecting the pedal to the main controller for shorts or corrosion.