Jungheinrich Error Code 1901 -
Jungheinrich Error Code 1901 is a safety-related event message indicating that the drive pedal was activated during startup. Why It Happens
Advanced Diagnostics (with Jungheinrich "CanAnalyzer" or laptop)
- Measure CAN_H to CAN_L resistance: should be 60 ohms (with truck off). 120 ohms indicates one missing terminating resistor. Infinite ohms indicates open circuit.
- Measure voltage between CAN_H and ground: ~2.5V (idle). Between CAN_L and ground: ~2.5V.
- Check for other CAN errors (e.g., 1902, 1903, 1904) – they point to the same bus issue.
If these basic checks do not resolve the issue, professional diagnostic tools may be needed to recalibrate the pedal's neutral position. Are you currently seeing other codes alongside Jungheinrich Forklift Error Codes - Machine Maxx USA Jungheinrich Error Code 1901
What does code 1901 mean?
Code 1901 indicates a timeout or complete loss of CAN bus communication between the traction controller (drive motor inverter) and the main control unit (MCU / vehicle master). The drive unit is not receiving the expected cyclic messages. Jungheinrich Error Code 1901 is a safety-related event
In most modern Jungheinrich machines (especially EFG and EJE series), this code signals that a specific control module—usually the Vehicle Controller (VE)—has lost communication with another major component, such as the display interface or a peripheral sensor module. Measure CAN_H to CAN_L resistance: should be 60
Specifically, Error Code 1901 (often appearing as 1901.1) indicates that the drive pedal was activated during startup. 18;write_to_target_document7;default0;869;18;write_to_target_document1a;_GxjuaaCCDKeP8L0P1LrdkAo_20;16;
If the error persists even when your foot is off the pedal, there may be a technical issue: