Based on Jungheinrich technical documentation for the EJE 120 (Electric Pedestrian Pallet Truck), Error Code 4372 indicates a CAN Bus Communication Fault, specifically related to the Battery Communication.

Here is a technical breakdown of the error, causes, and solutions suitable for a service or maintenance context.

3.4 Mechanical Binding – 5% of Cases

A seized drive wheel bearing, a bent motor shaft, or debris wrapped around the drive unit hub creates physical resistance. The motor tries to turn, but the load is too high. The speed drops, and 4372 appears.

Testing and verification after repair

• Verify battery voltage and health.
• Clear fault codes and monitor live data (motor currents, inverter temperature, CAN errors).
• Conduct gradual functional test: no-load traction, then light-load, then normal load.
• Run through at least one full work cycle representative of typical usage and re-check fault memory.

Part 3: The Root Causes – Why 4372 Appears

Unlike a simple blown fuse, Code 4372 is a logical error. It has four primary root causes, listed from most to least likely.

Recommended Repair

• If wiring/connector issue: Repair or replace damaged wiring harness. Re-pin or clean connector.
• If encoder faulty: Replace encoder (often requires drive motor removal) or replace the complete drive motor assembly.
• If controller suspected: After ruling out motor and wiring, replace the traction controller (requires reprogramming with Jungheinrich diagnostic software).