P0442
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Junior Member
Joined: Oct 2011
Posts: 21
From: Pittsburgh
P0442
I have gotten the Evaporative Emission Control System Leak Detected (small leak) PO442 code a few times so I changed the fuel cap thinking the seal was bad. Now two weeks after getting the new fuel cap I get the code again. When I went to check the new fuel cap it basically just pulled right off without having to unscrew it. Now I know that when I put fuel in yesterday I made the darn thing click 2 or 3 times to make sure it was on there and sealed. Is there some kind of voodoo chant rain dance animal sacrifice that one has to do to make sure fuel caps go on properly? I saw a TSB for 2006 h3 where "The seal between the filler housing and the fuel filler tube may be restricting the fuel cap from sealing correctly." Has anyone with a 2008 or newer h3 had any issues with the cap, and
does anyone know how much it costs to get the system checked for leaks?
does anyone know how much it costs to get the system checked for leaks? 
Super Moderator
Joined: Jul 2007
Posts: 13,056
From: Boat Town USA MI
Your code can come from an Evap hose getting loose or possibly rubbing on something causing a hole.
I wouldn't lose any sleep over it, it is purely emission related so you can take your time on having it looked at. First do some searching and check out as much of it on your own as you can.
I wouldn't lose any sleep over it, it is purely emission related so you can take your time on having it looked at. First do some searching and check out as much of it on your own as you can.
Member
Joined: May 2014
Posts: 31
Old thread I know - Problem is, I'm chasing this myself now on a new to me 07. Cap tested fine at the smog shop but the damn code comes back after I clear it and I'm thinking of smoke testing it now.
Anyone have any luck chasing these leaks down?
Anyone have any luck chasing these leaks down?
Senior Member
Joined: Jul 2012
Posts: 8,907
From: C-Town
Tests/Procedures:
1. Check the gas cap seal.
2. Check the filler neck for damage or corrosion.
3. Check for dirt in the vent solenoid line and charcoal canister.
4. Confirm the vehicle owner does not turn the engine off by turning the ignition switch to Accessory, without going to the off position.
Turning the engine off by turning the ignition switch to Accessory without going to the off position, can falsely set code P0442.
Replace the canister vent valve
1. Check the gas cap seal.
2. Check the filler neck for damage or corrosion.
3. Check for dirt in the vent solenoid line and charcoal canister.
4. Confirm the vehicle owner does not turn the engine off by turning the ignition switch to Accessory, without going to the off position.
Turning the engine off by turning the ignition switch to Accessory without going to the off position, can falsely set code P0442.
Replace the canister vent valve
Senior Member
Joined: Jul 2012
Posts: 8,907
From: C-Town
With the fuel cap off, Yes.
Senior Member
Joined: Jul 2012
Posts: 8,907
From: C-Town
ONLY, If you refill with the ignition in the on or accessory position, it will give you a false code. Pull the ignition key when you refill, I have to do that as I have a locking gas cap. If you get the code without refilling, there is a good chance the vent valve is the problem. GL
Senior Member
Joined: Sep 2008
Posts: 6,126
From: SE Michigan
Recently I got the same code several times and took it to my Dealer (under warranty). They replaced the gas cap, still had the code. Then they replaced the canister and solenoid, still had the code. They said they would try the fuel tank next.
I did a continuity test and found a corroded conector and wire on the solenoid(sensor). I spliced the wires and replaced the connector and NO MORE CODE. Should have charged the dealer for my time.
I did a continuity test and found a corroded conector and wire on the solenoid(sensor). I spliced the wires and replaced the connector and NO MORE CODE. Should have charged the dealer for my time.
Super Moderator
Joined: Jul 2007
Posts: 13,056
From: Boat Town USA MI
