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Check Engine Light (p0442 And P0455)


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2 replies to this topic

#1 stu & morpar

stu & morpar
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Posted June 19, 2009 at 01:05 pm

Hi
I am having a problem with my 1999 Dodge Neon RT. It's has the Check Engine Light on and the codes are P0442 and P0455. I have tried to replace the gas cap with one from Advance Auto, and then clear the codes. The Check Engine Light will come back on after about 150 miles and the codes are still P0442 and P0455. I have looked for cracks in the rubber tubing, no luck. Should I try a gas cap from the dealer? I really don't want to take this car to the shop for this problem when I can fix it myself.
Thanks
Stu

#2 ImperialCrown

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Posted June 19, 2009 at 03:21 pm

There is an evaporative leak somewhere in the system. Does your Neon have the LDP pump or the newer NVLD detector. It will show which one you have on the vacuum hose diagram sticker under the hood. The early NVLD's were a common failure.
You shouldn't be able to blow through the cap, it should be air-tight. Check for any dry-rotted/cracked rubber hose (usually at the ends)from the tank to the canister in the right front corner of the car up to the purge solenoid under the hood. If your filler tube is rusting out, you should see wetness and get a fuel odor after a fill-up. It only takes a pin-hole to set the code.

#3 stu & morpar

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Posted June 25, 2009 at 01:03 pm

There is an evaporative leak somewhere in the system. Does your Neon have the LDP pump or the newer NVLD detector. It will show which one you have on the vacuum hose diagram sticker under the hood. The early NVLD's were a common failure.
You shouldn't be able to blow through the cap, it should be air-tight. Check for any dry-rotted/cracked rubber hose (usually at the ends)from the tank to the canister in the right front corner of the car up to the purge solenoid under the hood. If your filler tube is rusting out, you should see wetness and get a fuel odor after a fill-up. It only takes a pin-hole to set the code.

Thanks for help, But I can't find the symbol LDP pump or NVLD detector on the sticker. If this is any help it has on the sticker Duty Cycle Purge Solenoid. I have now replaced the gas cap with a new on from the Dealer and cleared the codes.
Thanks again
Stu


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