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P1456 Honda Code - Evaporative Emissions Control System Leakage Fuel Tank

- Code Popularity: 465,165 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1456 Honda?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
⚠ Does your Honda have Safety Recalls? → Check here

How to Fix the DTC P1456 Honda?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code 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?

Labor: 1.0

To diagnose the P1456 Honda code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • A noticeable fuel odor may result from fuel vapor release

Code P1456 Honda Description

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.
OBDII Code P1456 Honda - Evaporative Emissions Control System Leakage Fuel Tank - AutoCodes.com
P1456 Honda Code - Evaporative Emissions Control System Leakage Fuel Tank

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