Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0455: EVAP System Leak Detected (Gross Leak/No Flow - Steps 1-3)

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Fig 2: DTC P0455: EVAP System Leak Detected (Gross Leak/No Flow - Steps 4-13)

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Fig 3: DTC P0455: EVAP System Leak Detected (Gross Leak/No Flow - Steps 14-19)

Courtesy of GENERAL MOTORS CORP.