The instrument panel cluster (IPC) displays the vehicle speed based on the information from the engine control module (ECM)/powertrain control module (PCM). The ECM/PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The ECM/PCM sends the vehicle speed information via CAN serial data circuit to the body control module (BCM). The BCM then sends the information via class 2 serial data to the IPC to order to display the vehicle speed and miles traveled.

Check for the following DTCs:

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Displays and Gages Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, raise the vehicles drive wheels.
2. Engine ON, transmission in drive, verify the scan tool Vehicle Speed parameter matches the speedometer display.

⇒	If the Vehicle Speed parameter does not match the speedometer display, replace the IPC.

3. Verify that the odometer is operating properly.

⇒	If the odometer is not operating properly, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming