Engine Codes

SapphireGTS

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I pulled 2 codes on my last run.

Mods include: Random Cats, Bellanger Headers, Roe S/C, Rev8 - 9 degree Vec2 cards.

P0442 EVAC Emission control system leak (small)
P0455 EVAC Emission control system leak (large)

Has anyone had same issues? What could these codes signify?
Any places to start?


Thanks!
Keith
 

BruceW

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0442- a small leak has been detected in the evaporative system
0445- a large leak has been detected in the evaporative system
Probably a leak in the system hosing, maybe in the canister. Not a big deal until you go for a smog check. The evap system controls the emission of gasoline vapors into the atmosphere. It has nothing to do with engine performance.
Your gas tank is vented into a canister in the front fascia and when you do a cold start a pump (the leak detection pump) pressurizes the system to see if the system has no leaks. If the pressure change is out of specs. it will throw this code. Probably in your case the pressure dropped too fast once the pump pressurized the system.
 

BruceW

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The Viper manual lists "Fuel level unit no change over miles" and then says "No movement of fuel level sender detected."
 
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