how to fix OBDII code po440?

Reply Subscribe

Thread Tools

Search this Thread

Dec 21, 2006 | 01:32 PM

UMD_Jesse

Thread Starter

TECH Apprentice

iTrader: (6)

Joined: May 2003

Posts: 377

Likes: 0

From: Fairfax County, VA (You know you're here when you see the bad roads)

how to fix OBDII code po440?

I have an SES light on my dash and scanner revealed it was code PO440 "Evap Emissions Device." Anyone know how to fix this? I cleared the code for now but know it will come back up. Thanks for the help!

Dec 21, 2006 | 01:43 PM

2001NBMZ28

TECH Senior Member

Joined: Dec 2001

Posts: 5,399

Likes: 3

From: Jacksonville, FL

Usually P0440 is a missing/bad/leaking/loose gas cap. Try that first.

Dec 21, 2006 | 01:45 PM

UMD_Jesse

Thread Starter

TECH Apprentice

iTrader: (6)

Joined: May 2003

Posts: 377

Likes: 0

From: Fairfax County, VA (You know you're here when you see the bad roads)

lol, damn! Imagine the poor guy who pays a gm dealer $100 bucks to fix a loose gas cap!!!

Dec 21, 2006 | 01:48 PM

2001NBMZ28

TECH Senior Member

Joined: Dec 2001

Posts: 5,399

Likes: 3

From: Jacksonville, FL

It can be something else too, just posted the most common/easiest thing to check first.

Dec 21, 2006 | 10:24 PM

BNKBRKR

On The Tree

iTrader: (5)

Joined: Nov 2005

Posts: 124

Likes: 0

From: SW KS

Also, make sure you're not filling the car up while it's running! That can sometimes cause a P0440. Like 2001NBMZ28 said, check the gas cap (basically the seal around the fill tube) if that does not fix it, you will have to have it hooked up to a smoke machine to find the leak. I just had to replace the Vent Valve on an '02 this week because it was stuck open. It's located on top of the gas tank along with the charcoal canister.

Reply Subscribe