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P1509 Diagnostic Trouble Code Discussion for January 2005

Idle Speed High - IAC System Not Responding

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Trouble Ticket Help Requests for DTC P1509
Help Request Posted
2000 Chevrolet Express 2500 5.7L Poor Idle Quality VIN: 1GCGG25R6Y
P1509: Idle Speed High - IAC System Not Responding. ... intermittent high idle. It has happened 3 times in 47,000 miles. The test data provided is freeze frame data from code P0507, the data for P1509 is similar. The driver reports as he comes to a stop the idle is very high. Putting the vehicle in neutral or p...
January 04, 2005