DTC P0448: EVAP System Vent Control - Vent Control Circuit Shorted: Condition

DTC sets when EVAP Canister Vent Valve (EVAP-CVV) output voltage is high while ECM commands EVAP-CVV to close. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• EVAP-CVV malfunction.
• EVAP-CVV circuit malfunction.
• ECM malfunction.