Perform the Diagnostic System Check - Vehicle , prior to using this diagnostic procedure.

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the temperature data via high speed GMLAN serial data to the body control module (BCM). The BCM then sends the information via low speed GMLAN to the IPC in order to display the engine temperature.

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References

1. Using a scan tool, ensure no other DTCs are set as current. If any DTCs are set as current rectify these DTC first.
2. Ignition ON, perform the engine coolant gauge test with the scan tool.

⇒	If the engine coolant gauge does not sweep from its low to high position, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming