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P0509 Diagnostic Trouble Code Discussion for December 2008

Idle Air Control Motor Sense Circuit High

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Trouble Ticket Help Requests for DTC P0509
Help Request Posted
2002 Saturn SL2 1.9L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G8ZK54782
P0509: IAC Valve Circuit High Input. We replaced the IAC (idle control valve) and cleaned the TB (throttle body) and deleted the above malfunction DTC's. After a test drive, we noted that there was excessive stalling problems and the DTC's had returned but only when cold. Upon deleted the DTC's a...
December 01, 2008