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Error codes P0442 & P0446 Likely fixes?

198K miles. Have already replaced the gas cap.

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A code P0442 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
Possible Solutions With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

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
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Since you are getting both of these codes the most likely problem will be a faulty Vent Valve.

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

motor1258
  • 6674 Answers

SOURCE: error codes p0442 & P0455

Those are both Evaporative Emission Control System related.
442 is a small leak has been detected.
455 is a bigger leak has been detected.
Check all your connections, (electrical & vacuum lines) as well as check for any cracked, loose vacuum hoses in the system, as well as clean "O" ring on your gas cap well and threads in filler pipe & make sure gas cap is tight. Do the gas cap first & see if codes dissappear, but it may take a new gas cap. These codes commonly appear shortly after getting gas, due to cap not back on tight.

Posted on Oct 03, 2009

  • 1 Answer

SOURCE: Got error codes P0440, P0440 (pd), and P0442 which

It is probably a sensor that goes by the gas tank. I belive it is called a Fuel Vent Sensor Circuit. That should fix the problem.

Posted on Dec 16, 2009

nicole99wu
  • 1049 Answers

SOURCE: Have codes P0441, P0442, and P0446. What could be

this obd2 trouble code table can help you understand the meaning of code.
and for p0441, you can try:
Repair damaged EVAP lines or canister.

Repair open or short in voltage feed circuit to Purge Solenoid.

Repair open in PCM purge command circuit.

Replace purge Solenoid.

Replace vacuum switch.

Repair restriction in Evap line or canister or soleniod.

Repair resistance in purge connector.

Replace PCM.

for p0442

Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.

Otherwise, replace the gas cap, or

Inspect the EVAP system for cuts/holes in tubes/hoses.

Posted on Aug 15, 2011

  • 1 Answer

SOURCE: p0446 obd2 code 2004 camry

We had the same problem and the agency just re-adjusted and we have no more problems just the real ones.

Posted on Sep 29, 2008

MrScary66613
  • 1990 Answers

SOURCE: 1998 toyota corolla dtc# p0441 and p0446

Yes it would cause these Codes.

Posted on Jan 15, 2009

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1 Answer

How to fix whatever caused the codes P0441, P0442,P0446


Check and make sure your gas cap is screwed on tightly. Then, check the vacuum lines are attached correctly and not leaking. I would bet one of the hoses came off or you have a hole in one or more. The hoses split with age. Start with these, before changing sensors or solenoids.
http://www.obd-codes.com/p0446
http://www.obd-codes.com/p0441
http://www.obd-codes.com/p0442

Feb 21, 2016 | 2003 Lexus LS 430

1 Answer

Error code 340 & 457


  • 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.

Oct 21, 2012 | 2002 Ford Focus

1 Answer

Have codes P0441, P0442, and P0446. What could be the problem?


this obd2 trouble code table can help you understand the meaning of code.
and for p0441, you can try:
Repair damaged EVAP lines or canister.

Repair open or short in voltage feed circuit to Purge Solenoid.

Repair open in PCM purge command circuit.

Replace purge Solenoid.

Replace vacuum switch.

Repair restriction in Evap line or canister or soleniod.

Repair resistance in purge connector.

Replace PCM.

for p0442

Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.

Otherwise, replace the gas cap, or

Inspect the EVAP system for cuts/holes in tubes/hoses.

Aug 15, 2011 | 2003 Toyota ECHO

1 Answer

2003 sienna with codes p0442 and p0446 what should i be looking for


most common is to check that ur gas cap is tight and or needs replacement 442 evap emissions control system leak detected [small] 446 is evap emissions control system vent control circuit malfunction the gas cap will set off these codes if cap is good need to then check the fuel and vent lines for cracked or dried out or partial disconnection

Jan 22, 2010 | 2003 Toyota Sienna

1 Answer

2001 Sable gets P0401 first, then gets P0442 some miles later. When P0442 sets, so does engine check light. Car runs well. What could cause this sequence of error codes?


This could be a small evaporative system leak. Check the gas cap to be installed fully. If fully installed may need replaced.

Oct 14, 2009 | 2001 Mercury Sable

3 Answers

I am blowing error codes P0442 and P0456, can i fix it myself


P0442 Evaporative Emission Control System Small Leak Detected
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

You should replace the VAPOR CANISTER PURGE REGULATOR.

Oct 03, 2009 | 2002 Dodge Dakota Club Cab

1 Answer

Error codes p0442 & P0455


Those are both Evaporative Emission Control System related.
442 is a small leak has been detected.
455 is a bigger leak has been detected.
Check all your connections, (electrical & vacuum lines) as well as check for any cracked, loose vacuum hoses in the system, as well as clean "O" ring on your gas cap well and threads in filler pipe & make sure gas cap is tight. Do the gas cap first & see if codes dissappear, but it may take a new gas cap. These codes commonly appear shortly after getting gas, due to cap not back on tight.

Oct 02, 2009 | 2001 Dodge Caravan

1 Answer

Getting the error code P0442 with a ODB2 on 2004 Caravan


Code 442 indicates a vapor leak in the EVAP control system. Fuel vapors are routed through hoses to the EVAP charcoal canister, then via purge control valve, are rerouted through intake when engine running. Bad gas cap seal is the usual culprit, which you can try cleaning the seal & filler neck where it screws in, then erase codes & try again & see if it comes back, or may require new gas cap. Other areas to look is at hoses running to & from canister & purge valve for any crack that may be a source of leak.

Jun 23, 2009 | 2004 Dodge Caravan

1 Answer

1999 chev. lumina emissions test (trouble codes p0442 & p0446 )


replace gas cap but first check for rust around rim of filler tube where gas cap makes contact with tube. if there is rust clean it off and replace the cap.then you need to clear the code in the computer to see if this was the problem.. corrosion on the filler tube will cause a small lesk in the evaporative system which corresponds to the 442 code

Dec 13, 2008 | 1999 Chevrolet Lumina

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