QuestionMy mom has a 1999 s70 t5 volvo and the check engine light came on, so we went to autozone and had them check the codes. The codes that came up were P1238, and P0455. Is there any way you can tell me what these are, and what is causing them. Any help will be much apreciated.
Thanks Brian
AnswerBrian,
PO455 Condition
when the EVAP canister shut-off valve is closed the fuel tank system should be sealed. When the EVAP canister purge (CP) valve is activated the fuel tank pressure must fall to a set negative pressure or it will be interpreted as a major leak. Then the canister purge (CP) valve closes. Fuel tank pressure must then remain within certain limits or it will be interpreted as a minor leak. Diagnostic trouble code (DTC) ECM-4308 is stored if the control module registers a minor or major leak.
Condition
None.
Possible source
Major leak:
Leaking fuel tank, filler pipe, fuel tank filler cap, evaporative emission system (EVAP) canister, evaporative emission system (EVAP) canister shut-off valve or lines between these components
Blocked evaporative emission system (EVAP) valve
Blocked hoses to the fuel tank pressure sensor or defective fuel tank pressure sensor. Does not react to changes in pressure.
Minor leak:
Leaking fuel tank, filler pipe, fuel tank filler cap, EVAP canister, canister purge (CP) valve or lines between these components
P1238 I can not find the cross reference to Volvos code.
