Jungheinrich Error Code 1901 __exclusive__ [TESTED – 2025]
Error Code 1901
Jungheinrich typically indicates a Startup Safety Violation , specifically that the drive pedal was already activated (pressed) when the truck was switched on or the startup sequence began . Quick Fix (The "Operator Error" Check) Turn the truck OFF . Ensure your feet are completely off the drive pedals . Ensure the directional switch is in Neutral . Turn the truck ON again. Detailed Troubleshooting Guide
Short Circuit:
A short in the wiring harness between the pedal and the controller can send a false "pressed" signal. Jungheinrich Error Code 1901
By systematically checking the physical connections and wiring integrity, most instances of Jungheinrich error 1901 can be resolved without the need for expensive component replacement. Error Code 1901 Jungheinrich typically indicates a Startup
Release the Pedal
: Fully release the accelerator pedal to its neutral position. Connect the service tester to the 9-pin or
- Connect the service tester to the 9-pin or 14-pin diagnostic socket.
- Navigate to Fault Memory > Drive Controller > Read Errors.
- Select Error 1901.
- Choose Clear / Reset Error.
- Cycle the key off and on.
- Perform a “teach-in” or “calibration” of the drive controller if prompted (this relearns accelerator pedal and encoder limits).
Step 3: Measure Sensor Resistance (Unplugged)
Error Code 1901
Unlike generic OBD codes, Jungheinrich uses proprietary manufacturer-specific codes. generally translates to: