Gas cap Code??

[IAFFCJ]

In my 2006 Dodge ram 2500 with a HEMI I have been getting a small evaporation leak code on and off for about a year now. It had been off for quite some time after having the CEL reset. About a month ago the CEL came back on and I am also getting a Gas cap code now. I figured that was an easy fix and was thinking that could be the cause of the evaporation leak as well. So I went and bought a new gas cap. Instaled the cap and reset the computer, got way better fuel mileage for about a week then all the codes came back and I am back to low fuel mileage. I was wondering if anyone had an idea of what other actions to take in an attempt to fix this myself before I break out the check book at the repair shop. Thanks

Jake

[lynskynbnd]

In my 2006 Dodge ram 2500 with a HEMI .......a small evaporation leak code.......... Gas cap code now. .................................................. ..................................... I was wondering if anyone had an idea of what other actions to take in an attempt to fix this myself before I break out the check book at the repair shop. Thanks

Jake

06 1500,2500,3500??
HEMI? 8th VIN #?

P04?? What code #s?

Your EVAP syatem is pretty simple. A purge valve, NVLDP(Vent Valve & switch), Canister, fuel tank, and hoses.

The computer checks for small and large leaks while running and very small leaks when not running.

On Chrysler products I've changed mostly cracked hoses, and secondly NVLDP's

Do you ALWAYS tighten the gas cap at least 3 clicks?

[IAFFCJ]

It is an 06 2500 with a HEMI 5.7 the 8th VIN# is D.

I tried to get the P codes and none are coming up with the key on off check it only reads GASCAP.

I do Always tighten the gas cap at least 3 most often more than that.

Do you think I may have gotten a bad new cap? I could get a second one. Thanks

[lynskynbnd]

You may have a leak in the system somewhere

Here's a Tech Service Bulletin on the subject:

NUMBER: 14-001-06
GROUP: 14 - Fuel System
DATE: January 21, 2006
SUBJECT:
Loose Fuel Cap Message or MIL (http://alldatapro.com/alldata/PRO~V260070089~C47247~R0~OD~N/0/115013665/116995776/150262271/150262275/34853741/34857029/34857030/34857480) Illumination for Diagnostic Trouble Code P0457 - EVAP System - Loose Fuel Cap

MODELS:
2005 - 2006 (ND) Dakota2005 - 2006 (CS) Pacifica2006 (DR/DH) Ram Truck2005 - 2006 (HB) Durango2005 - 2006 (KJ) Liberty2006 (LX) 300/Magnum/Charger2006 (PT) PT Cruiser2007 (PM) Caliber2006 (RS) Town & Country/Caravan/Voyager2006 (TJ) Wrangler2005 - 2006 (WK) Grand Cherokee2006 (XK) Commander
NOTE :This bulletin applies to all vehicles equipped with a gasoline engine.

NOTE :Do not replace the gas cap if only DTC P0457 - Evap System - Loose Fuel Cap is present.

DISCUSSION:
Starting with the introduction of 2005 model year vehicles a new diagnostic trouble code (DTC) P0457 - Evap System - Loose Fuel Cap was introduced. Also added to some vehicles was an instrument cluster message in the odometer display or message center (EVIC) that alerts the driver that the gas cap is loose.
The PCM monitors the fuel level for a "significant" change in either direction and remembers that this has recently occurred. A loose fuel cap DTC, cluster message or message center message matures when the check for the EVAP system large leak condition fails after the fuel level change event. If a leak of greater than 0.090" is observed after a fuel level change, a loose cap diagnostic single trip failure is stored and the cluster message or message center message is displayed even though a DTC may not yet be present. DTC P0457 - Evap System - Loose Fuel Cap is stored and the MIL (http://alldatapro.com/alldata/PRO~V260070089~C47247~R0~OD~N/0/115013665/116995776/150262271/150262275/34853741/34857029/34857030/34857480) illuminated after 2 cold start failures of the large leak diagnostic checks following a fuel change event. Only the passing of one of the 3 EVAP system diagnostic routines large leak, small leak or loose gas cap) by the PCM will validate that the cap is no longer loose and turn off the MIL light or message.
For 2007 model vehicles DTC P0457 - Evap System - Loose Fuel Cap will be stored and the MIL (http://alldatapro.com/alldata/PRO~V260070089~C47247~R0~OD~N/0/115013665/116995776/150262271/150262275/34853741/34857029/34857030/34857480) illuminated after 3 cold starts.
To temporarily clear the gas cap loose message from the odometer or message center press the reset button on the odometer or message center while the message is being displayed. This clears the message for the current key cycle only.
NOTE :The above works for all vehicles except, 2005 - 2006 Grand Cherokee or Commander. For these, the scantool must be used)

To clear the gas cap loose message from the odometer or message center ensure the gas cap is tight and let the vehicle run the small leak diagnostic routine. The small leak diagnostic routine will pass a sealed system after an 8 hour soak and a negative 3°C change in fuel temperature from the last key cycle.
NOTE :A heated garage may effect the small leak diagnostic routine.

To clear the gas cap loose message from the odometer or message center and matured DTC (MIL (http://alldatapro.com/alldata/PRO~V260070089~C47247~R0~OD~N/0/115013665/116995776/150262271/150262275/34853741/34857029/34857030/34857480) light) diagnose and repair the leak and then erase DTC's with the DRBIII(R)/StarSCAN(TM) scantool
NOTE :The DRBIII(R)/StarSCAN(TM) scantool may be used to reset the Loose Cap message. Select the PCM Reset function on StarSCAN(TM) (version 6.05_SPI or higher) or the Clear PCM Batt Disconnect function on DRB III(R). Disconnecting and reconnecting the battery will also clear the message.

If a gas cap loose message is displayed or DTC P0457 - Evap System - Loose Fuel Cap is set without P0455 - Evap System Large Leak then ensure the gas cap it tight, no further service action is required.
POLICY:
Information Only.

Disclaimer :This bulletin is supplied as technical information only and is not an authorization for repair.

[IAFFCJ]

Hmm. I guess I should look for cracked hoses and loose connections? Thanks for the info Ill let ya know what I find.

[ltdanyj]

Did you get the new cap from the dealer, or is it aftermarket? If it's aftermarket, I would definitely try a MOPAR cap....

[IAFFCJ]

It's an aftermarket one got it from advanced Auto.

[lynskynbnd]

Did you get the new cap from the dealer, or is it aftermarket? If it's aftermarket, I would definitely try a MOPAR cap....

It's an aftermarket one got it from advanced Auto.

I believe Stant makes caps for Mopar. As well as Ford and GM.
Most auto parts stores carry Stant products.

AA and AZ, idk. they aren't real parts stores. :rofl:

[IAFFCJ]

Well after crawling around under the truck for a while and realizing that I had no idea what I was looking for I decided to drop it off at the shop. Turns out the system wasn't holding vacuum due to a bad valve in the system causing the truck to think there was a leak. Had the valve replaced and one hose that had a small pin hole and all is better now. No more lights and it even seems to be running better.

[blthomas]

Well after crawling around under the truck for a while and realizing that I had no idea what I was looking for I decided to drop it off at the shop. Turns out the system wasn't holding vacuum due to a bad valve in the system causing the truck to think there was a leak. Had the valve replaced and one hose that had a small pin hole and all is better now. No more lights and it even seems to be running better.


Sounds great dude. Will the mileage go back up now?

[IAFFCJ]

We shall see. got almost 1mpg better on the way to work the other day on the overhead time will tell after the next fill up.