P0456, P0457-gas cap replaced and inspected...
...I'll start by saying that this is the first time I've had this issue on any of my model jeeps.
I got the dreaded gascap light, then CIL. P0456 and P0457 codes were pulled then cleared.
Replaced Gascap with OEM, Factory cap.
Immediately the same 3 symptoms came back on.
Traced lines all the way, smoked the lines from the white Evap module back to the filler(let out smoke from what I assume was a vent at the end of the filler module)
Smoked out the other line heading towards the gas tank but connected at the evap module. Nothing I could see. Smoke out the Evap module itself and saw no leaks.
Not sure where to go next....I was going to replace the white module, but couldn't find the part number. Thought it was called a leak detection pump and it was $30 ish bucks. Between this and the random oil leak I've developed, I'm going nuts. It's been 4 months.
2002 TJ, Silver, caged, 35 Trepadors-Sold
1998 TJ, Red, caged, 33 MTZs-Sold
2007 JKU-Rescue, Lifted, Locked, 35 Km2s
Last edited by hedmisten; 04-14-2015 at 03:18 PM.