DTC P0448: EVAP Circuit, Vent Control Circuit Shorted: Condition
DTC P0448 is set when EVAP canister vent valve output signal is too high. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- EVAP canister vent valve malfunction.
- EVAP canister vent valve circuit malfunction.
- ECM (PCM) malfunction.