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Old 08-28-09, 11:19 AM   #1
T&K's Baby
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Trouble Code P0442 - Evap System

Has anyone come across Trouble Code P0442 - Evap system, small leak. It seems that the gas cap is the usual culprit to this but I'm on my second gas cap now and I still get the code after 30 miles of driving. GM did admit to having a lot of bad gas caps out there. I can't detect any fuel leakage or smell. Any suggestions?
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Old 09-01-09, 02:51 PM   #2
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Did you reset the codes and make the engine light go out?

You can repair the problem with the gas cap but you must manually turn the CEL out. I am pretty sure it will not go out on it's own even after the problem has been solved...

Just checking with you. Maybe you've already been through this. IF you have NOT and need to know how to do all this, just say the word and I'll tell you what to do next....
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Old 09-01-09, 02:55 PM   #3
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Just in Case

How to check DTC codes:
1) Turn on the ignition, but don't start the engine.
2) Press "Reset" button in order to clear any IPC display warning messages.
3) Press and hold "Options" and press "Fuel" 4 times within a 10 second period.
4) The computer will now scroll through all the modules, showing the error codes. Once it is done it will display "No More Codes"
At any time you can scroll up and down to see each code by using the "Trip" and the "Options" buttons. Scroll to the component that has the code and press the "Gauges" button to view the code(s) numbers. To scroll through these code
numbers, use the "Trip" and "Options" button again. Hold "Reset" to clear any codes. You can delete one code at time or
all codes in any component.
5) Press the "E/M" button or shut off ignition key to end session

To optionally reset the codes once in manual mode
1) Press and hold RESET until it displays "NO CODES".
2) Press OPTIONS to go to the next module.
Repeat the steps in this paragraph until you have reset the codes in all the computer modules.


NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this.

Click for codes listing =====> C5 DTC Codes List
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Old 09-01-09, 03:23 PM   #4
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Quote:
Originally Posted by Glennm27 View Post
How to check DTC codes:
1) Turn on the ignition, but don't start the engine.
2) Press "Reset" button in order to clear any IPC display warning messages.
3) Press and hold "Options" and press "Fuel" 4 times within a 10 second period.
4) The computer will now scroll through all the modules, showing the error codes. Once it is done it will display "No More Codes"
At any time you can scroll up and down to see each code by using the "Trip" and the "Options" buttons. Scroll to the component that has the code and press the "Gauges" button to view the code(s) numbers. To scroll through these code
numbers, use the "Trip" and "Options" button again. Hold "Reset" to clear any codes. You can delete one code at time or
all codes in any component.
5) Press the "E/M" button or shut off ignition key to end session

To optionally reset the codes once in manual mode
1) Press and hold RESET until it displays "NO CODES".
2) Press OPTIONS to go to the next module.
Repeat the steps in this paragraph until you have reset the codes in all the computer modules.


NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this.

Click for codes listing =====> C5 DTC Codes List
There he goes again having all the right answers. Including links no less.
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Old 09-01-09, 04:22 PM   #5
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We just had the P0456 Evap System - small leak code here on the BatGirls Mustang. Pulled out the scanner to detect that it was indeed the EVAP leak. Tightened the gas cap, cleared the code and all's fine. It's been about 10 days now since that occurence all is still ok...

The P0442 code is the same as the one we found on the Mustang
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Old 09-01-09, 04:32 PM   #6
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I saw Ford is equipping some vehicles with a new cap-less gas tank. There's a spring loaded piece where the cap normally goes and you just insert the nozzle from the gas pump and fill up. Seems like a great idea. I've seen aftermarket gas caps that have the same feature but always wondered if they worked well. Anybody ever try one?
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Old 09-01-09, 05:57 PM   #7
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Quote:
Originally Posted by carboman View Post
I saw Ford is equipping some vehicles with a new cap-less gas tank. There's a spring loaded piece where the cap normally goes and you just insert the nozzle from the gas pump and fill up. Seems like a great idea. I've seen aftermarket gas caps that have the same feature but always wondered if they worked well. Anybody ever try one?
It's on the 2010 Mustangs.
IF it does not seal tightly every time,
can you image all the Mustangs showing up at the dealer with............
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Old 09-01-09, 08:00 PM   #8
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Quote:
Originally Posted by Glennm27 View Post
It's on the 2010 Mustangs.
IF it does not seal tightly every time,
can you image all the Mustangs showing up at the dealer with............
Ford, Fix Or Repair Daily!
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Old 09-01-09, 08:24 PM   #9
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Quote:
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Ford, Fix Or Repair Daily!
Found On Road Dead
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or, for the Ford fans
.
.
First On Race Day
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Old 09-02-09, 12:10 PM   #10
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I just got back from a business trip and haven't had a chance to really look this over yet. I do have a hand held code reader and I did clear the code and the check engine light does go out. It seems that it takes several on/off cycles and maybe over 30 miles of driving for the car to obtain enough data to trip report the code again.
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Old 09-02-09, 01:08 PM   #11
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THAT pretty much says it's a re-ocurring problem and probably NOT the gas cap.... BUT since it is not turning the CEL on every occurence it is probably not serious....

Steve at Bryner could figure this one out for you...
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Old 09-02-09, 01:12 PM   #12
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That's what I was thinking. It could just be a hose is starting to leak pressure and you have to drop the tank in order to get to it. Hopefully not.

Thanks Glenn
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Old 10-16-09, 05:00 PM   #13
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Finally got this resolved. The gas cap it self tested fine, all of the fuel lines tested fine for no leaks, it still ended up being the gas cap. It clicks way to early and you really can't get it tight enough to make a good seal. Tried more GM gas caps and finally resorted to using an aftermarket gas cap. There is a smoke test that would have been pretty cool to see where they fill your tank up with smoke and then pressurize the tank to see where your leak is, but we didn't need to take it that far.
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Old 10-16-09, 10:27 PM   #14
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Quote:
Originally Posted by T&K's Baby View Post
There is a smoke test that would have been pretty cool to see where they fill your tank up with smoke and then pressurize the tank to see where your leak is, but we didn't need to take it that far.
Umm, if matches or a lighter is involved it's best you stay home when they perform that particular test.

Glad it all worked out and it was nothing major.
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Old 10-16-09, 10:38 PM   #15
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I hear that, I'm not sure how they do the smoke test. I'm sure its like a fog machine or something similar. I should have asked how they do that test. I guess you could use Helium since it is easily detectable and an inert gas.

I have seen someone weld repairing an old metal gas tank and didn't fill it with water first. Ouch. That would leave a mark.
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