Vehicles with both G62-Engine Outlet, Coolant Temperature Sensor and G83-Radiator Outlet, Coolant Temperature Sensor.If coolant temp drops below minimum operating temperature (80☌) or never reaches operating temperature, (verified by external thermometer) suspect failed thermostat.Hold RPM around 1,500rpm and watch coolant temp increase in Graph until thermostat opens, indicated by a slight drop in coolant temp.Start Engine cold, graph Coolant Temperature Sender (G62) Typically MVB Group-001.Use Graph function in VCDS, Measuring Value Blocks - MVB.Inspect wiring for G83 (Coolant Migration, damage, corrosion, etc).Check (if applicable) G83 - Radiator Outlet, Coolant Temperature Sender.Inspect wiring for G62 (Coolant Migration, damage, corrosion, etc).Check G62 - Engine Coolant Temperature Sender.Thus a drop in coolant temperature below normal operating temperature is not possible without a Malfunction in Cooling System. The ECM knows the coolant temperature should stay within 80.0.110.0 ☌ typically after warm up. For example: Engine warms up, thermostat opens and stays open, coolant temperature drops below normal operating range.Note: This fault code sets when engine coolant temperature mapping is lower and out of expected range based on operating conditions of the engine. 1 18613/P2181/008577 - Performance Malfunction in Cooling Systemġ8613/P2181/008577 - Performance Malfunction in Cooling System Possible Symptoms.
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