Instrument Cluster Gauges Inoperative

Instrument Cluster Gauges Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

This diagnostic procedure applies to serial data gauges located in the instrument panel cluster (IPC) which includes the speedometer, tachometer, engine coolant temperature gauge, volt gauge, oil pressure and boost pressure gauge if equipped.

Diagnostic Aids

For the CTS-V, the tachometer gauge sweep test does not go to the maximum value, only approximately 7000 RPM.

Reference Information
Schematic Reference

Instrument Cluster Schematics Instrument Cluster Schematics
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Instrument Cluster Description and Operation Instrument Cluster
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Important: If the suspect gauge is the speedometer, the drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to Lifting and Jacking the Vehicle Service and Repair.


1. Ignition ON and the scan tool installed, perform the IPC Gauge Sweep Test in the IPC Output Controls. Verify that all gauge dials move from minimum to the maximum value and back to the gauge minimum value.

• If the gauges do not perform the IPC Gauge Sweep Test, replace the IPC.

2. Start the engine with the vehicle drive wheels raised and place the transmission in drive or first gear. Verify that the speedometer value matches the scan tool Vehicle Speed parameter in the ECM Engine Data List.

• If the speedometer is incorrect, test or replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for the IPC replacement, setup and programming