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P0455 Diagnostic Trouble Code Discussion for August 2019

EVAP System Large Leak

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Trouble Ticket Help Requests for DTC P0455
Help Request Posted
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GCEK19T63
P0455: EVAP System Large Leak Detected. ... random misfire, and evap issues. I found the vent solenoid was bad, would not close. the wiring tested fine so I replaced it. Looked over the basic engine data quickly and nothing jumped out at me. I did a baseline compression test before I sunk too mu...
August 30, 2019