Engine Coolant Temperature Gage

The ECM sends coolant temperature as determined by the coolant temperature sensor to the IPC via class 2. The IPC displays the engine coolant temperature with the gage. The engine coolant temperature gage defaults to cold (0°) or below if:

• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the ECM.