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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 >> Tachometer Inaccurate or Inoperative >> Circuit/System Description

Circuit/System Description

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The instrument panel cluster (IPC) displays the engine speed based on the information from the engine control module (ECM). The ECM sends the engine 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 engine speed.

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