DTC P0442:00, P0455:00, P0456:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSES

DTC P0442:00 DTC P0455:00 DTC P0456:00	P0442:00: EVAP system leak detected (small leak) P0455:00: EVAP system leak detected (gross leak/no flow) P0456:00: EVAP system leak detected (very small leak)
DETECTION CONDITION	P0442 00 indicates that a leak has been detected as small as 1 mm {0.04 in} in the EVAP vapor management valve solenoid system when there is less than 0.809 kPa {6.09 mmHg, 0.24 inHg} bleed-up over 20 s at 75 % fuel fill Bleed-up and evaluation time vary as a function of fuel fill level. The vapor generation limit is more than 0.286 kPa {2.15 mmHg, 0.085 inHg} over 150 s. P0455:00 indicates that a substantial leak or blockage has been detected in the EVAP system when there is -1.94 kPa {-14.6 mmHg, -0.575 inHg} or less vacuum for 75 s evaluation time P0456.00 indicates that a fuel vapor leak from an opening as small as 0.508 mm {0.020 in} has been detected by the EVAP running loss monitor test. Diagnostic support note This is an intermittent monitor (EVAP system) The MIL illuminates if the PCM detects the 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 is available. The DTC is stored in the PCM memory
POSSIBLE CAUSE	DTC P0442:00, P0456:00 After-market EVAP hardware (such as fuel filler cap) nonconforming to required specifications Fuel filler cap loosely installed Small leaks in components CV solenoid is not seated on the charcoal canister Cut or loose connection in the fuel vapor hoses/tubes Fuel filler pipe damaged Fuel filler cap and fuel filler pipe damaged CV solenoid valve malfunction Leaks in complete EVAP system Small leaks from EVAP system return tube to charcoal canister Small leaks between fuel tank vapor tube and fuel tank filler pipe PCM malfunction DTC P0455:00 After-market EVAP hardware (such as fuel filler cap) not conforming to required specifications Large EVAP system leak Fuel filler cap malfunction (damaged, missing or loosely installed) Both the input port vacuum hose and EVAP return tube are not attached to the CV solenoid valve CV solenoid valve is not attached to the charcoal canister Fuel vapor hoses/tubes disconnected or cracked Fuel filler pipe and the fuel tank damaged Blockage between CV solenoid valve and fuel vapor hose joint CV solenoid valve malfunction Fuel tank pressure sensor malfunction PCM malfunction

DTC P0442:00
DTC P0455:00
DTC P0456:00

P0442:00: EVAP system leak detected (small leak)
P0455:00: EVAP system leak detected (gross leak/no flow)
P0456:00: EVAP system leak detected (very small leak)

DETECTION CONDITION

P0442 00 indicates that a leak has been detected as small as 1 mm {0.04 in} in the EVAP vapor management valve solenoid system when there is less than 0.809 kPa {6.09 mmHg, 0.24 inHg} bleed-up over 20 s at 75 % fuel fill Bleed-up and evaluation time vary as a function of fuel fill level. The vapor generation limit is more than 0.286 kPa {2.15 mmHg, 0.085 inHg} over 150 s.
P0455:00 indicates that a substantial leak or blockage has been detected in the EVAP system when there is -1.94 kPa {-14.6 mmHg, -0.575 inHg} or less vacuum for 75 s evaluation time
P0456.00 indicates that a fuel vapor leak from an opening as small as 0.508 mm {0.020 in} has been detected by the EVAP running loss monitor test.

Diagnostic support note

This is an intermittent monitor (EVAP system)
The MIL illuminates if the PCM detects the 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 is available.
The DTC is stored in the PCM memory

POSSIBLE CAUSE

DTC P0442:00, P0456:00

After-market EVAP hardware (such as fuel filler cap) nonconforming to required specifications
Fuel filler cap loosely installed
Small leaks in components
- CV solenoid is not seated on the charcoal canister
- Cut or loose connection in the fuel vapor hoses/tubes
- Fuel filler pipe damaged
Fuel filler cap and fuel filler pipe damaged
CV solenoid valve malfunction
Leaks in complete EVAP system
Small leaks from EVAP system return tube to charcoal canister
Small leaks between fuel tank vapor tube and fuel tank filler pipe
PCM malfunction

DTC P0455:00

After-market EVAP hardware (such as fuel filler cap) not conforming to required specifications
Large EVAP system leak
- Fuel filler cap malfunction (damaged, missing or loosely installed)
- Both the input port vacuum hose and EVAP return tube are not attached to the CV solenoid valve
- CV solenoid valve is not attached to the charcoal canister
- Fuel vapor hoses/tubes disconnected or cracked
- Fuel filler pipe and the fuel tank damaged
Blockage between CV solenoid valve and fuel vapor hose joint
CV solenoid valve malfunction
Fuel tank pressure sensor malfunction
PCM malfunction