Alright...I've posted this awhile back. My car keeps throwing a P1451 code with the Check Engine light on.
When I pull the code with my scanner, it says Aux. Emission Controls. Someone a while back said to get a new gas cap. I did that. It didn't help. Any new ideas? I've talked to 100 people about it, and most said they've never seen a P1451 come up on a Mustang anyway.

Can someone get to the bottom of this for me?

Thanks!

 

why not call the Ford tech hotline, you know the number by now I'm sure!

 

I hadn't thought of that. Good idea Roundman!

<--- DUH!

 

Here you go:

P1451 DTC Trouble Code
Technical DescriptionEVAP Control System Canister Vent Solenoid Circuit Malfunction

What does that mean?The EVAP system 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.

SymptomsYou will likely not notice any drivability problems.

CausesA code P1451 may mean that one or more of the following has happened:

VPWR circuit open
Damaged canister vent solenoid
Canister vent solenoid circuit open or shorted to ground, power, etc.
Damaged Powertrain Control Module (PCM)
Possible SolutionsVerify canister vent solenoid - To verify normal functioning, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal. Output test mode may be used to switch output on/off to verify function.
Replace canister vent solenoid

 

So would you start with replacing the vent solenoid?


Thanks for the input MD.