OBD Code P0451

Evaporative Emission System Pressure Sensor/Switch Range/Performance

What’s mean?

OBD2 Code P0451 Definition:
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.

Symptoms

Possible sumptoms of P0451
– Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

Possible causes of P0451
– The EVAP control system pressure sensor circuit is open or shorted – Rubber hose to EVAP control system pressure is clogged, vent, kinked, disconnected or improper connection. – EVAP control system pressure sensor may be faulty – EVAP The Error code is generally activated on detection of the following conditions: – An improper voltage signal from EVAP control system pressure sensor is sent to ECM.

Possible Solutions