Causes and Fixes Chevy/GMC P0442 Code: Evaporative Emission System Small Leak Detected
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- เผยแพร่เมื่อ 26 ก.ค. 2024
- How to fix a Chevy or GMC P0442 Code: Evaporative Emission System
Small Leak Detected
Amazon Link to Smoke Machine: amzn.to/41U0Dif
How to Test a Purge Valve Video
• How To Test Evap Purge...
Possible Causes of a Chevy/GMC P0442 Code:
Bad Gas Cap or Inlet
Evap Leak
Purge Valve
Vent Valve
Wiring
Charcoal Canister
Fuel Tank Pressure Sensor
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If you have a scan tool that can do freeze framing. Ive found personally. That p0442 triggers on key on instantly if your tank pressure sensor is bad. You can scroll thru the data pids and goto evap-vp will show 0.0 (meaning its not working, in the module data for ecm i found that stats high was on a evap pressure parameter (shows the allowed voltages min/max and im .263 volts over the max telling me shorted out) hope this helps!
I’ve had aftermarket fuel neck leak where the plastic meets the metal where you fuel up at, they have a crappy way to crimp the metal, so i bought another from advance, it looked just like the one i got on ebay, this time i sealed around it with black RTV sealant, it worked!
Best video ever my Chevy 2016 won’t pass for nun thx major help
Big help, thanks
Good info
Just got the same code on my 2014 Silverado … thanks to this video i know where to start looking …. Thanks bud.
Did you figure it out? My 14 sierra just got it after they’ve replaced my fuel level sensor and temp sensor I’ve been getting a “tight gas cap” error for a month
@@5RWill not yet. These holidays have me spent lol but will try to adress the problem in January. Happy holidays !!
Did you fix ? Got same problem
@@blassmayahua3108 nope 🙂↔️
Some years ago I had to siphon old gas out of my truck, add new and a fuel additive to try and fix the ethanol build up in the bottom of the tank. Since then I’ve had the P0442 issue. I have to get gas ⛽️ at a pump that has more slender gas pump nozzles and turn it way up to the side, half way out to let the vapors out in order to fill up. Same with the Subaru as it was given to me and had been sitting for a few years.
Screwed up some flap in the filler neck I think. 🤔
I remember gas leaking from my gas filter i moved & it stopped leaking can this code be related to this code?
When performing the smoke test, did you use a scan tool or jumper out the vent valve to close it? If so, what wire did u jumper off from?
Its best to use a scan tool otherwise a wiring diagram for the vehicle is needed.
I had my fuel pump replaced about a year ago and the guy told me the fuel lines are brittle. Could this cause this code#?
We have changed the purge valve, gas cap, some frayed tubing, checked all wiring connectors. We are stumped.
Bad fuel lines could cause a fuel leak, but likely not a P0442 code. Bad Evap hoses can cause a leak and a P0442 code. It may be best to get an Evap smoke test done to see if there is a leak.
I got the code changed the evap canister and fuel caps, engine light went away, been driving it for a couple days now, engine light never came back on but it stills shows the code P0442 as permanent. Does it take a while for that permanent code to go away or do I still have a evap leak ?
The vehicle needs to go through a drive cycle, which needs to be looked up since it is different for each car or truck. Usually, just driving around will cause it to clear eventually.
If it doesn't clear from just driving, you can get a bluetooth module for the OB2 port and connect your phone to clear the old codes manually. Just be sure the issue is fixed before doing so.
I changed my purge valve. It idles much better now but I still got engine light blinking. Can’t find any other issues.
Would bad fuel injector cause the blinking? Still no code outside of p0442. I had p0496 when I replaced purge valve.
Not getting a code for fuel injector. Replaced all plugs
Already spent 100 almost for all these parts last thing I wanna do is pay someone else to look at it now. The engine light blinking is what’s causing me to worry.
If you only have an Evap code, it should clear with a scan tool. 2010 and newer vehicles need a drive cycle to fully clear, but the light should go off. If the codes come back, there may be another issue, such as a leak.
turns out the igni coil went bad also. idk why it took my code reader 3 tries to get the p0300 switched out the coil pack good as new@@HVAC_Mechanic
@MrDon967.
Most often when an engine light is blinking,you have an issue with a plug or plug wire,or possibly the cap. Blinking light in a Chevy is a misfire.
@@barrykiefer9387 yup i never had blinking engine light but now i know it means misfire n i got new sparks n ignition now so all set :D
Can bad gas also cause a p0442 code?
Bad gas would cause issues with the engine running, but I don't see how it would affect the EVAP system.
Shivy
I just got a suggestion just buy a Ford and you won’t have check engine lights on every single day. I got two Fords in a driveway and two Chevys in the driveway Chevy always got some kind of check engine light on always.
Sure I may have a check engine light, but it’s an easy fix and at least I have a truck that works for more than a year
Fords are a pain to work on, and you better have the part in hand when you go to the parts store .
In fleet, fords are the ones that come back the most for Evap codes.
That Chevy will still outlast that ford, with a Christmas tree gauge cluster