P1454 Honda DTC Code Explained?

You might have a vacuum leak in the EVAP system if you get the P1454 code on your Honda. Also, there could be a problem with a solenoid/sensor under the hood.

The fuel tank pressure is the cause of DTC P1454. You can sometimes get rid of the code by tightening the gas cap. However, replacement of the gas cap will be necessary if the light returns.

Honda DTC P1454 Definition: Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem

When starting a cold engine, the fuel tank pressure is about 0 kPa (0 in.Hg, 0 mmHg). 

An FTP sensor malfunction occurs when the output value of the fuel tank pressure sensor is out of a specified range, and the PCM determines that there is no other cause for the FTP sensor zero-point shift.

It is, however, difficult to distinguish between the FTP sensor zero-point shift (P1454) and the failure of the EVAP canister vent shut valve (P2422) when the FTP sensor output is a prescribed negative value or less when starting the engine (excessive negative pressure is detected).).

The PCM stores both Temporary DTCs if either P1454 or P2422 is not stored. The PCM stores the DTC of the temporary DTC if excessive negative pressure is detected with either Temporary DTC P1454 or P2422.

If P1454 and P2422 Temporary DTCs are stored and excessive negative pressure is detected, both P1454 and P2422 DTCs will be stored.

Possible Causes of the Code P1454 Honda

• There is a poor electrical connection in the fuel tank pressure sensor circuit.
• There is an open or shorted fuel tank pressure sensor harness.
• The sensor for Fuel Tank Pressure (FTP) is faulty.
• A faulty vent shut valve on an EVAP canister
• There is a blockage in the air vent or tube of the FTP sensor.
• EVAP canister blockage, canister filter blockage, vent hose blockage, drain joint blockage
• PCM, EVAP canister vent shut valve and FTP sensor have poor connections or loose terminals.

Diagnosing The P1454 Honda Code:

• The HDS should be connected to the DLC (data link connector).
• You need to remove the cap on the fuel filler.
• The ignition switch should be set to the On (II) position.
• The fuel tank pressure sensor voltage can be observed by selecting the PGM-FI data list.
• Follow normal troubleshooting procedures if the FTP sensor voltage is between 2.46V and 2.56V. There is no need to follow this service bulletin.
• Go to Repair Procedure if the FTP sensor voltage is not between 2.46V and 2.56V.

Fixing The P1454 Honda DTC Code:

In response to this trouble code, Honda has issued a service bulletin. According to Honda, this vehicle has an internal problem with the fuel tank pressure sensor.

Sensors need to be replaced with updated models to complete the repair. Follow these steps to replace the sensor.

• It is necessary to remove the EVAP canister.
• Lower the bracket and remove the three bolts holding the EVAP canister.
• The 2-way EVAP valve and the vacuum hoses for the fuel tank pressure sensor must be removed.
• Remove the FTP sensor and bracket assembly from the canister and throw them away.
• Attach the new FTP sensor to the new bracket after installing the EVAP 2-way valve
• Connect the hoses to the FTP sensor and 2-way valve

Final Words

Track down a wiring issue with the help of a mechanic. It is usually enough to replace the gas cap with a new one with a fresh seal on it to resolve the P1454 Honda code. Cleaning can sometimes be effective.