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Check engine

1K views 6 replies 4 participants last post by  Thunderheadhawkins 
#1 ·
Ust had emission test done late last month, passed. This morning check engine light came on. What. Do I check first?
 
#2 ·
Let us know your Jeep info and location that helps, but if you do not have a reader go to a local parts store such as Advance or Autozone they will typically scan your codes at no charge.
 
#5 ·
That code is for a small evaporation leak in the fuel vapor recovery system.

Just had a similar code on my wife's Jeep Compass which turned out to be just a loose gas cap.

Sometimes that's it, but it could mean a new gas cap or there is a vapor leak on one of the hoses (dry or cracked) under the hood at the evap canister.
 
#6 ·
I had P0456 pop on my TJ after I fixed the P0455 code. Tracing and replacing the cracked/old rubber lines solved the P0455 (mostly). Replacing the Gas cap fixed the P0456 code.

I will also add, that the bad gas cap passed the pressure test at the Jeep dealer when I drove in to ask about the cost on a smoke test.
 
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