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
Jungheinrich typically indicates that the accelerator (drive) pedal was activated during startup . This is a safety feature that prevents the forklift from moving unexpectedly when you turn it on. Resolution Steps
Need model-specific guidance? Leave your Jungheinrich model (e.g., ETV 318, EFG 550) and serial number prefix in the comments below.
Jungheinrich Error Code 1901: Causes, Troubleshooting, and Solutions Jungheinrich Error Code 1901
Disclaimer: Always consult your specific Jungheinrich model’s service manual for the most accurate information. Working on electrical components of forklifts carries risks.
A qualified technician should use a Jungheinrich diagnostic tool to check the "pedal value" in the controller. If the value is not at zero when the pedal is idle, the potentiometer needs adjustment or replacement. 4. Controller Reset Sometimes the error code is "latched" in the memory.
The pedal sensor (potentiometer) is malfunctioning and sending a "pressed" signal when it should be at zero. If the sensor is fine, the controller may
The symptoms associated with Error Code 1901 can vary but often include:
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Unlike generic OBD codes, Jungheinrich uses proprietary manufacturer-specific codes. generally translates to: This is a safety feature that prevents the
When the forklift's electronic control unit (ECU) detects an active signal from the accelerator pedal potentiometer during its initial self-test power-up sequence, it immediately blocks all travel functions and displays the event message or "1901.1" on the dashboard to protect the operator, surrounding warehouse personnel, and inventory. Technical Overview of Event Code 1901
Test the resistance across the signal wires. The voltage should change smoothly as you press the pedal, with a specific baseline voltage at rest.
If you see this code on your display, try the following steps to resolve it: Release the Pedal
This guide is for informational and basic troubleshooting purposes only. It is not a substitute for the official Jungheinrich service manual for your specific model. Always refer to the manufacturer's documentation and follow all safety procedures. For persistent issues or if you are unsure of any step, contact a certified Jungheinrich service professional.
Before replacing expensive electronic modules, technicians should follow a systematic isolation process to rule out simple wiring and power defects. Step 1: Perform a Hard Power Reset Turn off the key switch. Disconnect the main battery plug completely.