EastWestHemi
Senior Member
- Joined
- Feb 25, 2017
- Posts
- 154
- Reaction score
- 70
- Location
- Out West
- Ram Year
- 2016 2500
- Engine
- 6.4 w/4.10s
First got this code two years ago randomly and cleared it with the handheld scanner. Figured I didn’t get the gas cap tight or something. It came back a couple times in the past year, and cleared it.
Three months ago it is now persistent and popping up again every 4-5 cold starts— once a week. Replaced the fuel cap changed nothing. Then I checked over the lines coming from the top of the fuel tank, didn’t see anything wrong. So I went ahead and changed the leak detector, still popping up the same.
I should have just replaced the purge valve from the beginning. Today I tackled the purge valve, took it off, and sure enough I could blow through it. It was hard to blow through it but it definitely was letting air through. Went to the dealership and bought a new one. Tried to blow through the new one and it’s tight as a whistle. Installed and keeping my fingers crossed.
If anyone else is getting the p0456 I’d probably take a look at the gas cap and purge valve first, leave that leak detector module alone— although there is a rubber gasket that seals the leak detector to the evap canister that I suppose could dry and crack.
dealer prices— $55 for purge valve, $95 for leak detector module, and $30 for gas cap. Probably still saved money vs having the dealership do the work and now I have three new parts.
Be patient with the purge valve inlet clips. mine had a red locker clip that was easy to take off, but the little horseshoe white clip that actually holds the line is difficult. I had three little flathead screw drivers to carefully pry it in the right directions to get it out. I was worried that the plastic would be brittle, being my truck is 7 years old, but I got it free without breaking it. I pried the bottom first, and got that started before working in the top.
Just hope it’s not one of the lines that dives down behind the engine…. Time will tell.
Three months ago it is now persistent and popping up again every 4-5 cold starts— once a week. Replaced the fuel cap changed nothing. Then I checked over the lines coming from the top of the fuel tank, didn’t see anything wrong. So I went ahead and changed the leak detector, still popping up the same.
I should have just replaced the purge valve from the beginning. Today I tackled the purge valve, took it off, and sure enough I could blow through it. It was hard to blow through it but it definitely was letting air through. Went to the dealership and bought a new one. Tried to blow through the new one and it’s tight as a whistle. Installed and keeping my fingers crossed.
If anyone else is getting the p0456 I’d probably take a look at the gas cap and purge valve first, leave that leak detector module alone— although there is a rubber gasket that seals the leak detector to the evap canister that I suppose could dry and crack.
dealer prices— $55 for purge valve, $95 for leak detector module, and $30 for gas cap. Probably still saved money vs having the dealership do the work and now I have three new parts.
Be patient with the purge valve inlet clips. mine had a red locker clip that was easy to take off, but the little horseshoe white clip that actually holds the line is difficult. I had three little flathead screw drivers to carefully pry it in the right directions to get it out. I was worried that the plastic would be brittle, being my truck is 7 years old, but I got it free without breaking it. I pried the bottom first, and got that started before working in the top.
Just hope it’s not one of the lines that dives down behind the engine…. Time will tell.
