Engine code PO446 [Archive] - Hummer H2 Forum: H2 forums

Engine code PO446

10-05-2009, 12:31 PM
Hi Everybody, I keep taking my H2 hummer to the dealer with a check engine light on. The code is 446 EVAP circuit. They cant find the problem. I've brought this in 5 times for same problem. was wondering if anybody could help.
They replaced gas tank sensor,valve in gas tank and purge valve. any help would be appreciated. Thanks Joe

12-02-2009, 06:33 PM
I have the same issue. I clear the code, sometimes it stays of for a couple days, other times it comes one within 5 minutes of starting the rig. I have found that if I unscrew the gas cap and put it back on before I start it for the day the Service Engine Light does not come on.

I have taken it in twice, all the dealer did was clear the light and tell me to keep an eye on it.

Anyone have any suggestions?

Mistriu fase
08-16-2014, 01:28 AM
I recommend you a best option of this issue,it can be checked by the Vin decoder,so put your engine number or Vin number on this site,the fault will be displaying you on and you can solve it very easily.So have a look on Hummer VIN Decoder (http://myvindecoder.com/hummer-vin-decoder/").