05
Feb
2004 Honda Pilot Code P1456. The unit runs great. Causes of P1457 Code on Honda Vehicles If the EVAP system fails the self-test at least twice it will turn on the check engine light also known as CEL or MIL. This means theres a leak problem in the EVAP Evaporative Emission Control System particularly on the tank side and the engines computer has detected the issue. I have an Check Engine Light On and the code is P01456 or P1456.
Evap leak checked for leaks with smoke found none also checked cap also good replaced bypass evap valve still have problem i can watch the fuel pressure sensor and with the car off i have 15volts should be 25 with cap off start up car than it gose up to 25 also jumped out purge solinoild to any. Most common reason causing this code on Honda vehicles and how to prevent this from happening again. This means theres a leak problem in the EVAP Evaporative Emission Control System particularly on the tank side and the engines computer has detected the issue. Check engine light comes on 2004 Honda Pilot 5 Answers A repair shop said that its possible air leak in the fuel recovery system. I have replaced the gas cap and reset the computer and it came back and will not clear on its own. P1456 is typically caused by a faulty or loose gas cap although there are other issues that can cause it as well.
A leak on the evaporative systems tank side causes the code or DTC 1456 to display in the computers data list.
P1456 is a Honda manufacturer specific code for Evaporative Emissions Canister Leak Detected. Check Engine Light came on and stay on using Foxwell NT 210 scanner and detected trouble code P1456 indicated a problem in the EVAP Fuel system. This was in February. I have replaced the gas cap and reset the computer and it came back and will not clear on its own. Have a 2003 PILOT EX with 65000 miles on it. Honda has a Technical Service Bulletin about that code that you should read but most often that code is caused either by a bad seal on the gas cap or the cap no being tight enough.