Hyundai R485LC-9T Fault Code 216: Technical Guide

What is Hyundai R485LC-9T Fault Code 216?

Fault Code 216 indicates a malfunction in the engine coolant temperature sensor circuit or an abnormal coolant temperature reading detected by the ECM (Engine Control Module). This code specifically relates to the coolant temperature sensor sending voltage signals outside the expected range to the ECM, which monitors engine thermal conditions.

This fault is critical for the R485LC-9T because the ECM relies on accurate coolant temperature data to optimize fuel injection timing, control engine protection systems, and prevent overheating. When this sensor fails, the machine may enter a protective derate mode or experience reduced hydraulic performance.

Common Symptoms

When Code 216 is active on your Hyundai R485LC-9T, operators typically experience:

• Engine warning light illuminated on the instrument cluster, often accompanied by a coolant temperature warning icon
• Reduced engine power or hydraulic system derate, limiting digging force and travel speed
• Erratic temperature gauge readings that fluctuate abnormally or remain stuck at cold/hot positions
• Hard starting conditions, especially in cold weather, due to incorrect fuel mapping
• Increased fuel consumption as the ECM defaults to a fail-safe enrichment strategy