Engine Coolant Temperature Gage

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a GMLAN message from the ECM indicating the engine coolant temperature. The IPC receives the coolant temperature information via a GMLAN serial data message from the BCM. The engine coolant temperature gage defaults to 60°C (140°F) or below if:

• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of GMLAN communications with the ECM/PCM.
• The IPC detects a loss of GMLAN communications with the BCM.