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P0502 Diagnostic Trouble Code Discussion for March 2005

VSS Circuit Low Input

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Trouble Ticket Help Requests for DTC P0502
Help Request Posted
1996 Chevrolet C1500 5.7L Poor Idle Quality, Misfire, MIL Lamp on
P0502: VSS Circuit Low Input. Engine idles rough and won't idle lower than 1200 rpms. A week after spark plugs were replace #2 spark plug looks darker than the other ones. Scoped engine And found kvs ranging between 8 & 12 kv. #2 had 8kv and spark line was shorter than others, about .7...
March 06, 2005