showing a DTC P0446
 

my 2003 is showing a DTC P0446.What is this and how do I fix it?

Re: showing a DTC P0446
 

Just get gas ? Might check that gas cap is tight.

Condition for setting the DTC
The fuel tank pressure sensor is less than -10 inches H2O
The condition is present for as long as 30 seconds.

Said it may take three times of starting the truck for it to go away after the cap is tightened.

Ed

Re: showing a DTC P0446
 

Gotta love a good EVAP code. Autozone or Advanced Auto will reset it for you. May need to replace your gas cap, or take off and put it back on again.

Re: showing a DTC P0446
 

I had the same code, 4 times in the last 2 months. Had the dealer replace a few parts. I will PM you the parts they replaced. The last one to get replaced was the evap canister. It was coverd in mud. I know a sensor near the gas tank too. Again, too much mud. I will check my paperwork in the morning. If you reset it, I doubt the problem will go away.....lol. Better to fix it right IMO. Been a week, and so far so good. Seems like every 700 miles or so it would kick on.

Re: showing a DTC P0446
 

Bump, get it figured out ?

Re: showing a DTC P0446
 

If there is a lot of snow where you are from, the vent solenoid could also be clogged with snow under the driver's rocker panel.

Re: showing a DTC P0446
 

A lose or defective fuel cap is a more common cause of trouble code P0446, but if that's not it further testing of the evap system is required.

"An intermittent condition could be caused by a damaged evaporative emission (EVAP) vent housing, a temporary blockage at the EVAP vent solenoid inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem."

Re: showing a DTC P0446
 

I replaced my gas cap when mine popped a 446 about 4 months ago, and so far so good