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P0502 Diagnostic Trouble Code Discussion for January 2006

VSS Circuit Low Input

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Trouble Ticket Help Requests for DTC P0502
Help Request Posted
1997 GMC Yukon SLE 5.7L Stall, MIL Lamp on VIN: 1GKEK13R9V
P0502: vss low. After running through some sensor wiring verification tests, I've discovered that the CSFI unit has sprung a leak and pushed fuel into the PCM through connectors C1 and C2. I've heard of this but never had one yet. The question is, other than fixing the fuel l...
January 26, 2006