Engine Coolant Temperature Gage

The engine control module (ECM) sends the coolant temperature to the body control module (BCM) via class 2. The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the BCM. The IPC receives a class 2 message from the BCM indicating the engine coolant temperature. The engine coolant temperature (ECT) gage, if equipped, defaults to 75°C (160°F) or below if:

• The ECM detects a malfunction in the ECT sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of class 2 communications with the ECM.

Refer to Cooling System Description and Operation for more information.