Error Code 0802 — Jungheinrich

Include a thorough visual inspection of wiring harnesses in your monthly maintenance checklist. Pay close attention to:

This information comes directly from Jungheinrich’s diagnostic descriptions, which instruct the technician to remove the connector and measure the resistance on the respective terminals of the plug connector to check the individual valve coils. On‑off valves typically have a coil resistance of 15–30 Ω.

The error is part of the truck's self-diagnostic system designed to prevent unsafe movement. When the controller receives simultaneous inputs for forward and reverse, it triggers a safety stop to avoid mechanical or electrical damage. Primary Cause: Simultaneous activation of both travel directions. System Impact: jungheinrich error code 0802

Wiring insulation rubbing against the steel chassis, creating intermittent shorts to ground. 3. Mismatched or Corrupted Machine Parameters

. These components often require specialized diagnostic software (like Jungheinrich JUDIT) to re-calibrate or re-flash the system. Include a thorough visual inspection of wiring harnesses

| Diagnosis | Solution | |-----------|----------| | | Replace complete accelerator pedal assembly (part varies by model; e.g., 52084703 for ETV 114). | | Corroded connector pins | Clean with DeoxIT D5, apply dielectric grease, and replace damaged pins using a Molex extraction tool. | | Chafed wiring harness | Repair with solder + heat shrink (do not use twist connectors). Replace entire pedal harness if multiple breaks exist. | | 5V reference shorted to ground | Trace and isolate the short. Remove the pedal connector; if 5V returns, the pedal is shorted internally. If still 0V, disconnect controller — if still 0V, harness short. | | Lost calibration | Perform manual calibration (above) or use J’Diagnose to reset pedal limits. | | Faulty main controller | Replace or repair controller (e.g., Jungheinrich parts #565903). Requires firmware reflashing. |

: The internal contacts may be welded together. If the monitoring system detects voltage where there should be none (because the contactor should be open), this code triggers. The error is part of the truck's self-diagnostic

is a critical travel disable fault that translates to: “Speed command not plausible / Accelerator pedal signal out of range (low voltage or short circuit).”

: Check if the main contactor moves freely. If it feels "stuck" in the closed position, it needs replacement.