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Cadillac
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2009
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XLR Base
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Electrical
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Battery, Charging System And Starting System
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Diagnostic Information and Procedures
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DTC P0622
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Conditions for Setting the DTC
Conditions for Setting the DTC
DTC P0621 is not set.
Ignition ON engine OFF, the ECM detects a PWM signal greater than 65 percent for 5 seconds.
Engine running, the ECM detects a PWM signal less than 5 percent for 15 seconds.