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Home >> Pontiac >> 2004 >> GTO Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC 21

DTC 21

DTC 21 will set if the battery voltage drops below 8 volts for more than 20 seconds. If this DTC is set, refer to DTC P0562  for the diagnostic procedure.