P0451 Code - Evaporative Emission Control System Pressure Sensor Range/Performance

What Does P0451 Mean?

OBD-II Code P0451 is defined as a Evaporative Control System Pressure Sensor Range/Performance

The Code P0451 indicates that the Evaporative Pressure Sensor is indicating pressure change values that are not within specification, during the EVAP Monitor test and/or the operation of the vehicle.

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What are the common causes of P0451 ?

These may include a faulty or improperly installed fuel cap, a faulty purge control solenoid, clogged or broken charcoal canister, broken or cracked vacuum or fuel vapor hoses, a faulty pressure or flow sensor, or a bad PCM. PCM failure is rare.

How do you troubleshoot P0451 ?

In some instances, the repair for a P0451 code could be as simple as replacing the gas cap. Most of the time, though, resolving the issue will involve one or more of the following repairs:

• Repairing or replacing the gas tank.
• Repairing or replacing a faulty fuel tank pressure sensor.
• Replacing defective or damaged wiring or connectors in the fuel tank pressure sensor circuit.
• Replacing the canister vent valve.
• Replacing or reprogramming the PCM (rare).

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