Engine-Codes - Honda - P1456 Honda

P1456 Honda Code - Evaporative Emissions Control System Leakage Fuel Tank

- Code Popularity: 453,488 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

What are the Possible Causes of the Code P1456 Honda?

  • Missing Fuel Filler Cap
  • Incorrect Fuel Filler Cap used
  • Fuel Filler Cap remains open or fails to close
  • Foreign matter caught in the Fuel Filler Cap
  • Faulty EVAP Two-Way Valve
  • Faulty EVAP Bypass Solenoid Valve
  • Faulty EVAP Canister

How to Fix the P1456 Honda Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Code P1456 Honda Tech Notes

Usually, a loose or bad fuel tank filler cap will trigger these codes. Retighten the fuel tank filler cap and erase the code to repair the problem.

There is a Honda factory service bulletin with information on how to diagnose the P1456 on the following Honda models:
1998 Honda Accord
1999 Honda Accord
2000 Honda Accord
1998-2000 Honda Accord Factory Service Bulletin OBDII Code p1456

Troubleshooting DTC P1456 (EVAP system leakage [fuel tank system]) in a 2003-2004 Pilot? Pinch off all the hoses between the fuel filler neck and the fuel tank, and retest. If the leak stops, replace the fuel fill cap first. If you've still got the leak after replacing the fuel fill cap, then replace the fuel filler pipe. There's an O-ring between the plastic and threaded part of the filler neck that may be leaking.

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What is the Cost to Diagnose the Code P1456 Honda?

Labor: 1.0

The cost to diagnose the P1456 Honda code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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What are Code P1456 Honda Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

What Does the P1456 Honda Code Mean?

The evaporative emission (EVAP) control system stores fuel vapor from the fuel tank in the EVAP canister temporarily to prevent it from escaping to the atmosphere and to enable it to be drawn into the engine by intake manifold vacuum and burned. In addition, the onboard refueling vapor recovery system (ORVR) stores fuel vapor generated when refueling in the EVAP canister.
The EVAP control system leak detection method improves the accuracy and frequency of the detection by determining faulty components and vapor leakage for each part. The EVAP control system (from the purge valve to the fuel tank) is divided into two parts. One is the "EVAP Canister Side" (from the EVAP two-way valve to the purge valve) and the other is the "Tank Side" (from the EVAP two-way valve to the fuel tank). There is 0.04-inch leak detection and 0.02-inch leak detection. If the 0.04 inch leak detection results are OK, the 0.02-inch leak detection runs. The P1456 code is detected when the EVAP system has a very small leak.
P1456 Honda Code - Evaporative Emissions Control System Leakage Fuel Tank

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