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P0563 Diagnostic Trouble Code Discussion for July 2012

PCM Power Source Circuit Unexpected Voltage

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Trouble Ticket Help Requests for DTC P0563
Help Request Posted
1999 GMC Sierra 2500 SL 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTGK29U8X
P0563: System Voltage High. ... transmission wont shift.Test drive low power low fuel pressure. Pressure at 45 psi. Replaced fuel pump pressure at 60 psi. Checked alternator voltage 12.5 volts low. Check at ECM the same. Check wiring ok. No shorts or grounds. Code P0563 sets even with en...
July 30, 2012