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P0422 Diagnostic Trouble Code Discussion for October 2010

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2003 Chevrolet Silverado 1500 LT 5.3L MIL Lamp on VIN: 2GCEK19T33
P0422: Evap leak small. Engine light on intermittantly. Today we tested and system was not holding pressure but during test, it started holding pressure, but we did not change anything. Changed evap valve as per TSB twice now (thought might have been sticking). Light came back on. ...
October 01, 2010
2003 Chevrolet Silverado 1500 LT 5.3L MIL Lamp on VIN: 2GCEK19T33
P0422: Evap leak small. Engine light on intermittantly. Today we tested and system was not holding pressure but during test, it started holding pressure, but we did not change anything. Changed evap valve as per TSB twice now (thought might have been sticking). Light came back on. ...
October 15, 2010