Possible causes

– Loose or missing gas cap
– Faulty gas cap
– Canister Vent Solenoid harness is open or shorted
– Canister Vent Solenoid electrical circuit poor connection
– Faulty Canister Vent Solenoid

When is the code detected?

The code indicates that an EVAP system leak has been detected.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1451 Description

Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.

P1451 Information for specific makes

P1451 ACURA
P1451 BUICK
P1451 CADILLAC
P1451 CHEVROLET
P1451 FORD
P1451 GMC
P1451 MERCURY