DTC P0442 Or DTC P0455: Condition
WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0455 is set if fuel tank internal pressure does not drop below a specified value within a specified time, and it raises varying above a specified value a gross leak in EVAP system is detected. Fuel tank must be at least 1/4 full, engine must be running at normal operating temperature and EVAP canister purging. ECM monitors this circuit once per drive cycle.
DTC P0442 is set when Fuel Tank Pressure (FTP) after a specified time varies more than specified value, a small leak in EVAP system is detected. Fuel tank must be at least 1/4 full, engine must be running at normal operating temperature and EVAP canister purging. ECM monitors this circuit once per drive cycle. Possible causes are:
- Missing, loose or malfunctioning fuel filler cap, or leak from cap gasket.
- Loose or plugged vacuum hose.
- Leaking fuel pump assembly seal on fuel tank.
- Open or short in EVAP system circuits.
- CPV malfunction.
- FTP sensor malfunction.
- Fuel level sensor malfunction.
- Fuel tank component malfunction.
- ECM malfunction.