Reconnect the battery firmly and turn the key on. If the code immediately returns, it is a hard hardware or wiring fault. Step 2: Check Fuses and Power Relays
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To help narrow down the exact cause, could you share the of your Jungheinrich truck (e.g., EFG 316, ETV 214)? Let me know if any recent repairs were done, or if the truck has been exposed to moisture or cold storage conditions . Reconnect the battery firmly and turn the key on