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I get this code to tighten my fuel cap but it does not make my check engine light come on it just states it on the odometer screen, ive checked the gasket on the fuel cap and tightened it down really hard but still comes up??
do u think i have a leak in my fuel system somewhere? any help will help thx
try replacing the cap with a new one.
ill grab a new one today from advance auto
Get an OEM. Might need a smoke test.
OEM fuel cap??
Yes, aftermarkets often leak.
oh ok well igot the new cap and a code poped up P0442 EVAP Leak (small) idk where this leak could be i hope its not my fuel lines cracked or cut anybody experience this code??
The best way to diagnose this is with a smoke machine. It's a dealer item although there may be some aftermarket alternative.
I have just recently had the "tighten fuel cap" read out also.
The cap was fine.... No resolution on the issue yet, when I figure it out...
I'll pass it on. Good luck on the shopping ha ha ha
It just means you have an EVAP leak. The system tells you a few times to give you a chance to tighten the cap if it was left loose....if not, gotta get it fixed the right way.
well i remade most of the EVAP lines goin to the intake and hopefully it is not leaking anymore, I havent had the code come back yet since i deleted it.
Takes a while for the diagnostics to run for P0442 and P0455. An 05 runs the test with the key off.
oh wow didnt know that i guess ill check that after it has sat for a bit, do u think if it comes back if i should take off my bed and find if I have a leak in my fuel lines and EVAP lines to EVAP reservoir??
Look at the EVAP canister really close and make sure it's not cracked from road debris, etc. Check the seal on the cap or have it tested. Make sure to use a GM cap or a GM accessory locking cap...no aftermarkets. Has the fuel tank or sender/pump been removed recently? Possible bad seal on the sender module.
im glad GasGuzzler is the man at anwsering questions lol, no i have never removed any of the fuel system at all they are about 85,000 miles old so maybe a rock cracked my canister can i check from going under my truck?? Thx
Yes, it's the big plastic box with two small hoses and one large pipe. Look at all the black plastic pipes too.
ok ill be under thier today so ill check it all over if the canister seems fine do u think it could be the gas tank leaking??
Could be but that's not really common. The only common gas tank leakers are the 2002+ extended wheel base GMT370 (Trailblazer and clones) that have trouble with the filler neck bung breaking off.
ok just making sure, i looked around the tubes all the way to the inttake but could not find any cracks or leaks, the canister seemed fine but could not see the top area of it.
I had po455 pop up today evap leak(major) so i think im gonna go back through and make sure there r no cracks anyone experience any of this before?
pretty common with a bad gas cap or one that is not tight.
Not tight accounts for 95+% of them...
But it seems there has been enough time for you to verify that. There is a leak....or a bad FTP sensor.
Come on up and I'll put the smoke to it...