Mike's Workshop Manuals
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2005
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L300
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Repair and Diagnosis
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Section 4 (Battery, Charging System And Starting System)
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Diagnostic Information and Procedures
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DTC P0621
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Notes
DTC P0621: Notes
WARNING:
This page is about a different car, the 2004 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Body Control Module Generator Control Circuit Schematic
Courtesy of GENERAL MOTORS CORP.