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P0502 Diagnostic Trouble Code Discussion for May 2015

VSS Circuit Low Input

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Trouble Ticket Help Requests for DTC P0502
Help Request Posted
1996 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on, VIN: 1GCEK19R1T
P0502: VSS Circuit Low Input. Customer's complaint was Speedometer and cruise don't work and transmission not shifting intermittently. Found that PCM data showed no VSS speed until engine warmed up, then it would start working. Scoped VSS signal and found 5 volts on VSS signal wire on star...
May 29, 2015