Engine Coolant Temperature Gage

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the powertrain control module (PCM). The IPC receives a GMLAN message from the PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 38°C (100°F) if:

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