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Check engine light came on,trouble code is p0456

V8 5.4L vin L 330ci FI MFI GAS SOHC

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dustyboner
  • 331 Answers

SOURCE: Diagnostic code P0456 for 2003 Dodge Ram 1500 5.7

P0456 = EVAP Emissions Control System Leak Very Small

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

Posted on Aug 24, 2008

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greg_margo
  • 1959 Answers

SOURCE: Code P0456 on 2003 Town & Country

Below are the possible causes for your engine light and error code:

Possible Causes:

  • EVAP fuel tank or canister vapor hoses leaking or damaged
  • EVAP system component leaking, fuel cap loose or missing
  • Leak detection pump damaged or leaking

The fuel cap is probably the most common cause of this problem. It's considered part of the emission system and if faulty or not place on the filler tube correctly, it will throw an error. Best of luck with your engine light issue. Take care!
Greg

Posted on May 18, 2009

hotrodshop
  • 106 Answers

SOURCE: I have a 2003 dodge ram 1500 with a V-8 4.7 engine

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

Posted on Jun 12, 2009

  • 4088 Answers

SOURCE: codes

The first two were not listed in the file that I have, the third has to do with evaporative emission control has a small leak. The first two seem to be other codes having to do with the same area. Check the hoses and fittings at the fuel tank area for leaking or damage for the vent system. Check the fuel entry to tank hose and fittings. Locate (underneath the body) and check the charcoal canister for cracked case, loose or damaged fittings. Clear the light with the scanner and see if other codes show up. Are there any obvious problems other than fuel vapor leaks?

Posted on Aug 22, 2009

morse008
  • 1111 Answers

SOURCE: engine trouble codes: p0016 p0340 p0344 p0456

You can look up the codes on Wiki site

Posted on Nov 04, 2009

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====
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====
I strongly recommend you to open a CHAT SESSION instead of a single page email session.
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5 Answers

Diagnostic code P0456 for 2003 Dodge Ram 1500 5.7


P0456 = EVAP Emissions Control System Leak Very Small

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

Aug 22, 2008 | 2004 Dodge Ram 1500

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