P0457 engine code

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P0456 Evaporative Emissions System Small leak detected P0457 Evaporative Emission Control System Leak Detected None of these codes would cause a no start ! Does the truck engine crank over no start or no crank no start ?

no engine size stated, so>???? how can we guess.

did you look in the FSM book yet, ?
it covers all that.
it means something is busted.
alldata.com long and and read. its there 24/7, just look.
the 455 series are all EVAP failure.
do you know what that means (tank vent system closed?)
it means you must test the EVAP system.
first drive with gas cap , tight, (or new cap)
and clear the DTCs with the scan tool ,
does the DTC error end? good
no , then its a real failure.
step 2 in the fsm is , get the system pressure or leakdown tested.
"takes tools to do that"


ill print out 457
P0457-Loose Fuel CAP

see that? verbatum. from FSM.

googling jeep P0457 will get 9000 hits
https://www.google.com/webhp?gws_rd=ssl#q=+jeep+P0457

ever google?

456 is a small evap leak check hoses to evap canister by fuel tank.

replace or tighten gas cap , then clear hard code with hand held computer . will not clear unhooking battery

From what I found on that error code:

P0457 Ford - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off

http://engine-codes.com/p0457.html

I would replace the cap first.
The code means the computer can not vent the fuel tank to the vapor canister because there is a leak somewhere. The most common spot is the gas cap.
If a new cap does not fix the problem, you would need to have someone check all of the hoses and valves for a leak, including the gasket on top of the gas tank.
You have to use a scanner to clear the code and turn the light off when the problem is fixed.

• P0340 - Camshaft position sensor circuit malfunction.
  
• P0457 - Evaporative emission control system leak detected (fuel filler cap loose/off)
  
  There is a bulletin #0398 posted on 05/12/2003 for P0457 - Malfunction indicator lamp (mil) illumination with diagnostic trouble codes p0442, p0455, p0456, p0457, p1442 or check fuel cap lamp illuminated with diagnostic trouble code p0457.

I'd suggest checking with your local dealer, as it may be a fix that is covered by the dealer.

You haven't had a Tune-Up in 25 years

You may have gotten new spark plugs
That is called Preventative Maintenance

PO457---EVAP Control System Leak Detected
(Fuel Filler Cap Loose)

PO507---Idle Air Control System RPM highter than expected
Sloppy work on the part of whomever does your repairs

Check for Vacuum Leaks from Air Filter Cover, & ducting
to Throttle Body

Doubt the Air Idle Control is the issue

P0457 FORD - EVAP Control System Leak Detected (Fuel Filler Cap Loose/Off)
EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. The evap system integrity check uses a Fuel Tank Pressure Transducer (FTPT), a Canister Vent Solenoid (CVS) and Fuel Level Input (FLI) along with the Vapor Management Valve (VMV) or Electric Vapor Management Valve (EVMV) to find 0.040" diameter or larger evap system leaks. Federal vehicles can utilize a 0.040" leak check rather than the 0.020" leak check required for California vehicles (click over pic for zoom).



Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors

Possible causes:
- Missing fuel filler cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap

Possible solution:
- Retight or replaced fuel tank filler cap

Tech notes:
It is a very common problem with Ford vehicles. There are service bulletins for the following vehciles:
1997-2000 Ford CONTOUR
1997-2002 Ford ESCORT
1997-2003 Ford CROWN VICTORIA, MUSTANG, TAURUS
1998-2003 Ford ESCORT ZX2
2000-2003 Ford FOCUS
2002-2003 Ford THUNDERBIRD
1997 F-250 Ford HD
1997-1999 Ford Ford F-250 LD
1997-2003 Ford E SERIES, EXPEDITION, EXPLORER, F-150, RANGER, WINDSTAR
1999-2003 Ford F SUPER DUTY
2000-2003 Ford EXCURSION
2001-2003 Ford ESCAPE, EXPLORER SPORT TRAC, EXPLORER SPORT

Also, in this link could check this Ford Bulletin.

Hope helps (remember to rate and comment this answer).