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2005
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Grand Prix Base
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Engine Performance
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Engine Controls - 3.8L - DTC P0406 To DTC P1111
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DTC P0685: Engine Controls Ignition Relay Control Circuit
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Conditions for Setting the DTC
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Conditions for Setting the DTC
The PCM detects more than 4.6 volts on the relay coil control circuit for more than 2 seconds.