Does the purge vent normally stay open? Is this code strictly a diagnostic failure? If yes to both, I won't worry about this. I cleared the fault code to see if it reappears.
Searching other posts on this code, they found unrelated engine issues.
2006 Envoy 5.3
P0446 - GM
Type Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description
EVAP Purge Vent Valve Circuit Conditions
Cause
Engine speed over 40 rpm, system voltage from 7.5-15v, then the PCM detected a short to ground, an open circuit or a short to power in the Purge control circuit during the test period
Searching other posts on this code, they found unrelated engine issues.
2006 Envoy 5.3
P0446 - GM
Type Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description
EVAP Purge Vent Valve Circuit Conditions
Cause
Engine speed over 40 rpm, system voltage from 7.5-15v, then the PCM detected a short to ground, an open circuit or a short to power in the Purge control circuit during the test period
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