Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. 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)

Courtesy of GENERAL MOTORS CORP.

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

Courtesy of GENERAL MOTORS CORP.

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

Courtesy of GENERAL MOTORS CORP.