DTC P0442, P0455, P0456: Notes
DTC P0442, P0455, P0456 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
| DTC P0442 |
P0442: EVAP system leak detected (small leak) |
| DTC P0455 |
P0455: EVAP system leak detected (gross leak/no flow) |
| DTC P0456 |
P0456: EVAP system leak detected (very small leak) |
| DETECTION CONDITION |
DTC P0455, DTC P0442, DTC P0456
- The PCM measures the pump load current (EVAP line pressure) after a specified period has elapsed since the EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference load value, or the rate of the load increase is lower than the specification within a specified period, the PCM determines that the EVAP system has a very small leak.
MONITORING CONDITION
- The ignition switch is turned off.
- IAT: 5-35 °C {41-95 °F}
- Battery voltage: 10.9 V or above
- Atmospheric pressure: 72.3 kPa {542 mmHg, 21.4 inHg} or above
- Fuel tank level: 15-85%
- Time from engine off: 5 h or more.
Diagnostic support note
- This is an intermittent monitor (Evaporative system).
- The MIL illuminates if the PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA (Mode 2/Mode 12) is available.
- The DTC is stored in the PCM memory.
- DIAGNOSTIC MONITORING TEST RESULT is available.
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| POSSIBLE CAUSE |
DTC P0442, P0456
- After-market EVAP hardware (such as fuel-filler cap) not conforming to required specifications.
- Small holes or cuts in fuel vapor hoses/tubes (P0442, P0456).
- Change over valve stays partially open on closed command.
- Damaged, cross-threaded or loosely installed fuel-filler cap.
- EVAP system component seals leaking.
- Purge solenoid leaking
DTC P0455
- After-market EVAP hardware (such as fuel-filler cap) not conforming to required specifications.
- Disconnected or cracked change over valve, purge solenoid valve outlet tube, or EVAP return tube.
- Loose, malfunctioning, damaged or missing fuel-filler cap.
- Loose fuel vapor hose/tube connections to EVAP system components.
- Change over valve stuck open.
- Damaged charcoal canister.
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