Engine Coolant Temperature Gauge (if equipped)

The instrument cluster displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the engine coolant temperature information via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the engine coolant temperature. The engine coolant temperature gauge defaults to 40°C (104°F) or below if:

• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The BCM detects a loss of serial data communications with the ECM.
• The instrument cluster detects a loss of serial data communications with the BCM.