Need P0446 Code Help

[clauritzen]

I have a 2001 1500 with the 5.3V8 motor (ext. cab sb 4x4 LT). I was my dads and had the service engine light on for a long time for the P0446 code. I replaced the vent valve and the purge valve and light keeps coming back on. Usually can go for a day or so and then it comes back on and I get the same P0446 code. Can someone give me some ideas on what else may need to be replaced?

Thanks!

[aleekat]

I had a similar issue on a dodge ram 1500. Had some split hoses attaching to the valves.

http://www.samarins.com/diagnose/p0446.html

[j cAT]

Originally Posted by clauritzen

I have a 2001 1500 with the 5.3V8 motor (ext. cab sb 4x4 LT). I was my dads and had the service engine light on for a long time for the P0446 code. I replaced the vent valve and the purge valve and light keeps coming back on. Usually can go for a day or so and then it comes back on and I get the same P0446 code. Can someone give me some ideas on what else may need to be replaced?

Thanks!

the 446 is a small fuel tank/system vapor leak. venting / purge solenoids as well as the canister/gas cap/leak in the fuel filler pipe, fuel vapor lines. common would be stuck open solenoid venting/purging valves/cracked canister. new silverados have bad tank pressure senders.. with 2001 I would guess at vapor lines/cracked canister/stuck solenoid valves.

[MikeD268]

Just went through this myself with a nearly identical truck. Check my thread out here http://www.automotiveforums.com/vbul...33#post7153133