Question about 2001 Dodge Ram 1500 Truck 2WD

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01 dodge ram 3.9 moter check engine light

2001 dodge ram 1500 evap leak small evap leak large.I replaced gas cap and cracked hose.Light still comes on.

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  • peaslee72 Jul 22, 2010

    I cleared the code every time I do something new.It still pops up a day later.Not shure what I should do next.

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A Large leak is almost never a gas cap, thats usually the small leak. Dodge uses cheap hoses that crack badly. Check the canister in the Engine compartment, passenger side. Then check passenger side behind the cab by the frame. 2 canisters and hoses leaving that ,often cracked. Last is a piece that connects from the hard steel lines near the oil pan....one of these three usually

Posted on Dec 05, 2012

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  • Dodge Master
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Did you clear the code after replacing the gas cap and cracked hose?
You can do this with an OBD-II scanner from Walmart which costs under $100, or have the auto parts store do it that you bought your parts from if they are willing.

Posted on Jul 22, 2010

  • Duane Wong
    Duane Wong Jul 22, 2010

    OK, there must be a leak somewhere or the circuit that determines that the gas cap is loose is faulty.

  • bward0013
    bward0013 Dec 05, 2012

    gas cap is usually small leak, large leak is usually the hoses from the canisters by the frame behind the cap, passenger side or passenger engine compartment.

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Dodge ram gas cap light and check engine light on at the same time p0456 and p0457


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Evap leak


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I have a 2003 dodge ram 1500 with a V-8 4.7 engine and my check engine light came on with a P0456 code and I have been told that it could be the gas cap, I have checked it and it seems fine but should I...


The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

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2 Answers

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5 Answers

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Is the gas cap on tight or is the seal damaged? If it needs replacement, get it from the dealer.

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