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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) displays the vehicle speed based on the information from the body control module (BCM). The ECM sends the vehicle speed signal information via the GMLAN serial data circuit to the BCM. The BCM sends a GMLAN message to the IPC indicating the vehicle speed. The IPC displays the vehicle speed based on the GMLAN serial data message from the BCM.

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