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Cadillac
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2005
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XLR
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls (DTC P0638 To P2095)
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DTC P0687
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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM detects a higher than expected voltage on the relay coil control circuit.
The condition is present for more than 200 milliseconds.