DTC P0442 - EVAP SYSTEM (SMALL LEAK DETECTED) GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

EVAP emission system includes the following components: fuel tank, EVAP vent solenoid, fuel tank pressure sensor, fuel pipes and hoses, vapor lines, fuel cap, EVAP emission canister, purge lines, and EVAP purge solenoid.

Conditions required to set DTC are

1. No ECT, IAT, MAP, TP or VSS sensor DTCs set.
2. DTC P0125 not active.
3. Fuel level 12.5-87.5 percent.