: The forklift will not move forward or backward, and the mast will not lift, tilt, or sideshift.
Low or unstable voltage can cause electronic modules to drop off the CAN bus. Ensure the battery is fully charged, terminals are tight and corrosion‑free, and the battery is properly sized for the truck’s demands.
If the main line contactor fails to close properly or has pitted contacts, the safety loop remains open. Step-by-Step Troubleshooting Guide
If a specific module loses its dedicated power supply or suffers an internal hardware failure, it will completely vanish from the network. Techs frequently trace this back to a failed , or a fried internal component inside the main hydraulic interface board. Physical Wiring and Connection Failures
Jungheinrich forklifts utilize a Controller Area Network (CAN-bus) system. This specialized network serves as the forklift's central nervous system, allowing multiple onboard microcontrollers and modules to share data in real time. When you turn the ignition key, the interface display controller initiates a high-speed "handshake" sequence with all critical auxiliary modules, including: jungheinrich error code 0802
If the error occurs intermittently when turning or lowering the handle, the issue lies in the tiller wiring.
| Cause | Fix | |-------|-----| | Corroded connector | Replace pin/socket or whole connector housing | | Broken CAN wire | Repair or replace harness section | | Missing termination | Install 120‑ohm resistor (part no. 51157028 example) | | Faulty control unit | Replace (requires Jungheinrich software coding) | | Low voltage | Charge battery, clean main terminals |
Digital Multimeter (DMM), contact cleaner, Jungheinrich Judit diagnostic software 🔍 Understanding the Root Causes of Error 0802
: Ensure the battery is fully charged. Sometimes a simple "surface charge" can trick the display while the battery lacks the "depth" to power the motors. Electrolyte Levels : The forklift will not move forward or
Damaged, frayed, or disconnected wires in the communication harness. Controller Interface Errors:
: In rarer cases, the signal-evaluating controller itself may be misreading the voltage input. sd95d2cbd361a0b8d.jimcontent.com Troubleshooting and Repair Steps 1. Check the Battery Status The first step is always to verify the battery's health. Charge Level
For a technician or warehouse manager, seeing on a Jungheinrich display can be a frustrating "stop-work" moment. On many Jungheinrich EFG series forklifts, this specific code typically signals a communication failure or a missing component on the CAN-bus system. Essentially, the truck’s central "brain" is calling out to a part, and that part isn't answering. What Does 0802 Actually Mean?
Does the error happen or while driving/turning ? If the main line contactor fails to close
Discussion: JUNGHEINRICH EFG316 error 0802 - Forklift Action
If the error appeared after a parameter update, ensure all changes were saved correctly using the "SSP" button and required passwords in the diagnostic software. sd95d2cbd361a0b8d.jimcontent.com When to Call Professional Service
CAN-bus Data Communication Network / Controller Architecture
The most common causes for error 0802 are:
A physical failure inside the right-hand traction controller, hydraulic power pack module, or the primary interface motherboard will cause the device to stay dark upon boot. If a controller cannot execute its internal self-test, it cannot send a completion packet back to the network. 4. Severe Battery Voltage Under-Sinking