Posts Tagged: P0449 Equinox

P0449 Equinox: Troubleshooting the Vent Solenoid Control Circuit

February 3, 2018

Understanding P0449 Equinox: EVAP Vent Solenoid Control Circuit A P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit means there’s a problem with the vent solenoid or the circuit to the solenoid. Don’t just assume that you have a bad vent solenoid. Check the circuit first. Here’s how P0449 Circuit Description Battery voltage is applied to the EVAP emissions (for more information on EVAP systems, read this post) charcoal canister vent solenoid valve. When the ECM conducts a purge cycle to remove gas vapors from the charcoal canister, the ECM grounds … Read More