Jungheinrich Error Code 1901 <TESTED - 2026>

Jungheinrich Error Code 1901: Description & Immediate Action

Error Code: 1901 System: Traction / Drive Controller (typically CAN bus related) Error Type: Communication fault / Timeout

Swap suspected module: If spare/replacement display or control module available, swap to confirm module-specific failure (perform only if trained).

Firmware / software: Check module firmware versions and compatibility; update via official Jungheinrich tool if an update addresses communication faults.

Cross-reference other codes: Use service manual to see if 1901 is secondary to another primary fault; address primary faults first.

Method 3 – Emergency Bypass (Not Recommended, Temporary Only)

Warning: This is for moving the truck a few meters onto a trailer or out of an aisle. Do not operate normally. Some older Jungheinrich models (pre-2015) allow a temporary override: Jungheinrich Error Code 1901

In this guide, we will dissect everything you need to know about Jungheinrich Error Code 1901, including its technical meaning, root causes, step-by-step diagnostic procedures, and permanent solutions. Jungheinrich Error Code 1901: Description & Immediate Action

• At 20°C: 2,500 Ω ± 5% (2.5k ohms)
• At 80°C: approx. 300 Ω

2. Damaged or Loose CAN Bus Wiring

The CAN bus uses a twisted pair of wires (typically CAN High and CAN Low, often colored orange or yellow in Jungheinrich harnesses). If these wires are chafed, partially cut, or loosely connected at the controller’s 12-pin or 35-pin connector, intermittency occurs. Swap suspected module : If spare/replacement display or

Guide: Diagnosing and fixing Jungheinrich Error Code 1901

Summary

• Error 1901 on Jungheinrich forklifts typically indicates a communication fault between the vehicle control unit and a subsystem (common: display/control panel, driver control module, or CAN-bus peripheral). Treat as an electronic/communication error before assuming mechanical failure.

If the code persists after a restart and physical inspection, the issue is likely a faulty accelerator sensor or a wiring harness failure. These require specialized diagnostic tools to calibrate or replace. You can refer to the Jungheinrich Operating Manuals Database0;4a1;0;850; for series-specific electrical diagrams. 18;write_to_target_document7;default0;a76;18;write_to_target_document1a;_GxjuaaCCDKeP8L0P1LrdkAo_20;16;

Wiring Fault: Damaged or shorted harness wires sending a false voltage signal to the controller. 3. Operational Impact