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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Description

Circuit/System Description

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The instrument panel cluster (IPC) displays the vehicle speed based on the information from the engine control module (ECM). The ECM sends the vehicle speed information via the serial data circuit to the body control module (BCM). The BCM then sends the information via the serial data circuit to the IPC in order to display the vehicle speed and accumulated miles traveled.

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