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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 608 (Instrument Panel, Gauges & Console) >> Diagnostic Information & Procedures >> DTC B0540: DIC Receives Class 2 Message Indicating Loss of Vehicle Speed >> Circuit Description

Circuit Description

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The DIC receives the vehicle speed information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The PCM also sends a class 2 message to the DIC indicating the vehicle speed. If the DIC determines there is a loss of the vehicle speed signal from the PCM due to a vehicle speed signal circuit malfunction, a DTC sets.

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