Question about 2008 Toyota Prius

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Check engine the check engine light is on for the evap system. I have had it checked multiple times, told I wasn't closing the gas cap correctly--guess I forgot how after 6 years of driving this car! I have put 2 new gas caps on, light still comes on. Dealer not helpful, no surprise there. Does anyone have any ideas?

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Posted on Jan 07, 2018

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  • Expert
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Take it to another mechanic/dealer. Sometimes a second opinion is the best thing

Posted on Jan 07, 2018

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Posted on Jan 02, 2017

  • 736 Answers

SOURCE: Check engine light comes on if gas cap is loose

replace the gas cap .. clean the gas filler pipe where it seals against the gas cap .. .. even a small crack in the rubber seal will trigger the check engine light ..

Posted on Jul 02, 2009

  • 19 Answers

SOURCE: toyota seinna po440, po441, po446

you have to understand that there is a leak in the system other than the gas cap for the evaporative system. The system needs to be professionally closed, and smoke introduced into to find the leak, and a through component check, eg.. purge valve vapor canister vent solenoid all functioning correctly

Posted on Sep 01, 2009

canbruce75
  • 1776 Answers

SOURCE: Check Engine light goes on consistently

I would take the car to an autoparts store and have them scan the computer for codes stored. Most parts stores will do the scan for free. The check engine light is to alert you that the computer has noted a fault in one of the car's systems. A loose or faulty gas cap can cause an intermittent check engine light, but it could also be something in the evaporative emissions system that is causing it. Getting the codes should help end speculation so that the problem may be properly addressed. Sorry for your trouble and I hope this helped. Best wishes.

Posted on Sep 16, 2009

  • 1986 Answers

SOURCE: check engine code "P0446 Evap Control System Vent Control Circ"

Unfortunately, this code has nothing to do with the gas cap....
A code P0446 could mean one or more of the following has happened:

  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Here are some things you could try to fix it:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM


Posted on Nov 17, 2009

  • 1374 Answers

SOURCE: warning light at right side of display panel - take car to dealer

Did you have the vehicle scanned for codes?
If so what were the codes?
Gas cap has to be pressure tested. Looking fine is not gonna cut it.
If you didn't have the vehicle scanned go to Autozone they will do it free. Then get back to me and we will take it from there.

Posted on Apr 14, 2010

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2 Answers

How do you turn off the service engine soon light on panel


No , no joke ! a leaking gas cap can cause a code for the evaporative emissions system and turn on the check engine light . This EVAP system stores fuel vapors in a charcoal canister that the PCM - engine computer will purge at certain times . But that doesn't happen that much . Most of the time it is other componets That cause the leak ! Plus there are other thing's that will turn on the serviced engine soon light ! Your vehicle can set hundreds of DTC'S - diagnostic trouble codes . If the light is on there has to be codes stored or a problem with the instrument cluster . Your best bet take it to the dealer !
Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

Jun 04, 2017 | 2002 GMC Safari

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Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok


The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

Jul 23, 2012 | Honda Accord Cars & Trucks

2 Answers

ENGINE LIGHT IS ON. CODE READING 0445. PURCHASED NEW GAS CAP AND RESET THE CODE. TWO DAYS LATER, ENGINE LIGHT CAME BACK ON. I WAS TOLD THE SOLINOID MAY NEED TO BE REPLACED. DOES THE 05 LACROSSE NEED A...


Lets start with how knowledgeable you are

You have an EVAP System issue,maybe

You asked if the gas cap is specific

You know that it is to some extent
Application Specific -but the parts store
would give you the correct one

Was the first code even related to a gas cap?

When you say I was told, you mean what?

A professional mechanic you asked a question,
took a guess to give you an answer?

Do you know how to test the solenoid your
referring to? If not take it to a repair shop &
let them Smoke Test it & actuate all the system
components with a scan tool.

May 26, 2011 | 2005 Buick LaCrosse

3 Answers

P0456 error code on a 2003 Mits. Galant


P0456 = "Evaporative emission (EVAP) control system leak detected (very small leak)."

Feb 25, 2011 | Mitsubishi Galant Cars & Trucks

1 Answer

My check engine light came on. I tightened up the gas cap, drove it for a couple of days and it cleared up. I too it in to Sears because the maintenance check was due, and had an oil change done and an...


Your car has a sophisticated pressure test for the evap system. If the engine light is not on, the system is working. A loose gas cap is a typical reason for the light to come on. Once corrected, the system needs time on the road to retest and clear the code. Why do you believe you still have a problem?

Dec 12, 2010 | 2004 Jeep Grand Cherokee

2 Answers

CHECK GAS CAP / ENGINE SERVICE ARE ON


Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.

Oct 07, 2010 | 2001 Pontiac Bonneville

2 Answers

Why check engine light come on mostly after refuiling after a long drive ?


Because your vehicle is a 2008 I feel it shouldn't be anything to pressing but still take some precautions.

What alot of people don't know is sometimes if the gas cap is not put on tight enough a little air might get in or your gas pump might have to work a little harder because it can't get full vacuum pressure with the cap slightly open. these are not major issues.

these are reasons why your check engine light comes on. It happened to my 2005 Buick Rendezvou We had the check engine light on for a week. The car never shuttered, stalled, delayed starts it ran perfectly fine. I took it in to check engine light their computer showed that it was the EVAP system which is the heating and cooling system I would have to get it checked for leaks or do a static check for leaks.

This didn't look good but then one day I had done some work for a friend told him of my problem he told me it could be my gas cap. The next day I asked my wife if the gas cap was working on vehicle it actually was broke I replaced gas cap and the check engine light came off.

Now with this story (which is true) don't assume every problem could be this. But if you are not noticing any stalls, delayed starts, shuttering anything out of the ordinary check the cap at times to make sure it is closed.

If you keep on having light on and replaced cap or made sure was securely on then take and get it checked out.

merry christmas

Dec 25, 2009 | 2008 Hyundai Accent

1 Answer

2003 Kia Rio Check Engine Light


Obviously if it is a large evap leak it isn't the gas cap, if your car has an evap canister have someone check this to see that it is operating properly and no leaks at hoses going in and out of it.

Sep 17, 2009 | 2003 Kia Rio

3 Answers

Check Engine Light won't go off


If you have an Advance Auto Parts store where ever you are, they will read the code and tell you exactly what to code is and what it means. Any mechanic who "guesses" isn't a mechanic at all - he's a thief. Emissions leak can be any number of things, but not the gas cap!

Aug 21, 2009 | 2003 Dodge Caravan

2 Answers

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

Jun 12, 2009 | 2003 Dodge Ram Maxi

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