New Here Just Bought a Savana Cutaway

Hello everyone So i have a few questions. I bought a used 10ft U-Haul. I got it off marketplace for 500 bucks. It has the 4.8L I have a few codes. Hope someone can help me I have been trying to do research and it's all very confusing. So here is the list.

P0452, P0446, P0449. I have checked the gas cap I know there are a bunch of solenoids and all. I'm not sure where they are all at. So if maybe someone can help me would be great thank you.

 

what's the year and miles please?

what are the full codes with meaning please? You can look them up on obd-codes.com

 

hello its a 2003 GMC Savana with 162,000 miles 4.8L and its a box truck Thank you.

 

sounds like you're referring to the EVAP system. Check for leaks with a smoke machine. vent and purge valves are usually connected to the charcoal canister near the fuel tank.

 

Do you know where I got under there and couldn't really find anything are they all related to the evap system? I did check all the lines for vacuum and they looked good maybe some pics I know there is something on the engine that might need to be replaced as well. Thanks for the help

 

How EVAP works
https://www.aa1car.com/library/evap_system.htm
https://www.agcoauto.com/content/news/p2_articleid/294

 

I saw this video but I have a savanna van or a express and thought it was on a different place I think I need 3 items to clear these DTC codes thank you

 

what you need is to diagnose the issue

 

So I understand I need to diagnose the issue but this doesn't help telling me where the parts that would need to be replaced are as different models different things I don't know what all sensors I need to check to replace them...... Was hoping someone else had these issues could help out. Thanks

 

so the first two links I posted explain how the system works
Did you look near the fuel tank like I suggested? The charcoal canister is hard to miss. From there you can follow the hoses and locate the valves.
Between the three videos you should be able to figure out how to diagnose the issue. The other link I gave you (obd-codes.com) also explains how to diagnose.

If you have any specific question then post them here and I'll do my best to help.