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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 795 (Instrument Panel, Gages, And Console) >> Diagnostic Information and Procedures >> DTC P0608: Driver Circuit State Mismatch >> Circuit Description

Circuit Description

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The PCM creates the vehicle speed output signal by pulsing the circuit to ground. The PCM pulses the circuit at the same rate as the vehicle speed signal input. The PCM monitors the voltage on the vehicle speed output circuit. If the PCM determines the voltage is out of the normal operating range, a DTC sets.

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