Volt Gage Inaccurate or Inoperative

Volt Gage Inaccurate or 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

The instrument panel cluster (IPC) displays the vehicle voltage based on the information from the body control module (BCM). The BCM provides voltage information to the IPC via serial data.


Diagnostic Aids

The voltmeter may fluctuate between 12 and 14 volts. This is normal operation. For further information, refer to Charging System Description and Operation (Description and Operation) or refer to Voltmeter Gage under the Instrument Panel section in the owners manual.


Reference Information
Schematic Reference

Instrument Cluster Schematics (Instrument Cluster Schematics)
Connector End View Reference

Component Connector End Views (Component Connector End Views)
Description and Operation

Instrument Cluster Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Programming and Relearning (Programming and Relearning)for Scan Tool Information


Circuit/System Testing

1. Ignition ON, perform the volt gage sweep test with the scan tool.

• If the volt gage does not sweep from its low to high position, replace the IPC.

2. Ignition ON, verify the scan tool Battery Voltage parameter matches the value on the volt gage.

• If the value on the volt gage does not match the scan tool parameter, replace the IPC.




Repair Instructions

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


Programming and Relearning (Programming and Relearning)for IPC replacement, setup, and programming