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My 2007 dodge magnum with the 2.7 l v6 had the electronic throttle control light come on. The check engine light has been on for a while and the thermostat has been stuck at cold it won't start now and the codes read p2181, p0455, and p0456. What might the true problem be and how do I fix it?

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  • Cars & Trucks Master
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I will start with, have the codes fixed as they come up. Some codes you don't have to fix right away, some would be , stop driving the car. You need an honest mechanic to tell you the difference. @181 is a bad coolant thermostat, replace it. The reason the car shut down is the EVAP system. small and large leak. 455 and 446. codes. Small leaks are seals and the seal for the gas cap. large leaks could be seals at the purge and vent solenoids, but could also be broken lines(*plastic) between the fuel tank, charcoal canister and the purge line to the front of the car. Have them checked.

Posted on Nov 16, 2014

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  • Expert
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Typical is you are in a location where winter is kicking in, and with a stuck thermostat, your temperature of operating engine is triggering codes bases on ECU not sensing accurate conditions. Your ECU is probably not allowing car to start as it is sensing an overly rich fuel mixture which can impede cold starts in cold weather. Replace that thermostat, it is there for a reason and when not working, engines never warm up to proper operating temperature which triggers all sorts of codes.

Good luck
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Posted on Nov 16, 2014

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Posted on Jan 02, 2017

SOURCE: CODES,P0442,P0455,P0456,P1684

P0442, P0455 AND P0456 are all evaporative leak monitor test failures (small, medium and large leaks). These codes appear anytime the integrity of the air space above the fuel or the lines to/from the vapor canister or purge valve. If there is no damage to the canister, check the lines that run under the van from the fuel tank and canister to the purge valve (under the hood). Also, check to make sure that the hoses are not split or disconnected where they connect to the purge valve. The P1684 is abit more confusing. This is not a valid DTC for your vehicle. It's possible the scanner the shop you went to is an OTC scanner that is reporting a false code. It's also possible they wrote it down incorrectly. The closest thing that makes any sense is a P1486 which would indicate a pinched hose in the same monitor system as the other 3 codes. Best of luck!

Posted on Jun 20, 2008

hotrodtod38
  • 141 Answers

SOURCE: code P0456,P0455, &P0442

hello po442 ,po455,po456 is leak detected possible, check the gas cap , basicaly you have a leak that is larger than 0.020' and smaller than 0.040' in the gas evaporative system use your nose to find this one thanks

Posted on Feb 14, 2009

  • 202 Answers

SOURCE: 1999 lincoln navigator obd code p0455

Either the fuel cap, or the evap solenoid on the charcoal canister. I'd start with the fuel cap.

Posted on May 27, 2009

  • 115 Answers

SOURCE: Check Engine Light - P2181

Hi,first thing your cambelt and tensioner should have been replaced 13k miles ago,it would pay you to replace the water pump at the same time as they are known for impellor failure = cooling system fault=P2181 code,hope this helps.
Darren

Posted on Aug 06, 2009

  • 205 Answers

SOURCE: 2007 dodge magnum 2.7 v6 made a noise when i

the bendix may have gone bad. take the starter off and take it to an auto parts store such as auto zone they can test it.

Posted on Oct 15, 2009

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