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p0504

  1. CTS First Generation Forum - 2003 - 2007
    Anyone run into a code showing on the built in code reader (2003 Only) but not any other OBD-II scanner/reader? I've tried 3 standalone readers (apparently I collect them) and all are missing a code. The same code... P0504h - Brake Switch A/B Correlation My brake lights do work properly but...
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