What does OBDII code P0446 Evaporative emissions control vent circuit low mean?
The previous answer was good for high dust environments (and if you have a Ford Van all environments are to be treated as high dust) but for those of us in high corrosion environments, consider the following:
If you have an Explorer (Or Ranger/Mazda B-series) check for a broken wire near the left side framerail near the rear axle.
If you have a Hyundai (including Kia), Nissan (including Infinity) or Toyota (including Lexus or Scion) you should disconnect the electrical connector and then apply and remove 12V power to the vent solenoid/valve. The difference between 12V applied and not applied should be the difference between not being able to blow through it and being able to. After testing at least 5 times, if it fails even once, replace the solenoid/valve.
In the case of Nissan or Toyota, if replacing solenoid/valve it is usually best to replace the canister as well as you might inadvertently break the canister while replacing the solenoid/valve. With many Nissan vehicles, it is almost impossible to not break the canister without using techniques involving unreasonably high fire hazard.
Hey Brian==It is probably the gas cap not on tight. Have the codes removed and see if it comes back on after you tighten the cap.GoodluckJoe
Well, my experience with a 2000 GMC 3/4 ton truck says otherwise.
A loose gas cap will not give you P0446 because that is the code for a failed vent test.
Here's how it works: To check the vent system the engine vacuum valve is opened at the same time as the charcoal filter vent valve is closed. This creates a vacuum in the gas tank and when the vacuum reaches a certain level, the vacuum valve closes and the vent valve opens and a timer is started. If there is a restriction in the vent valve or it doesn't operate electrically, the tank fails to re-pressurize within the correct time and you get a P0446.
Here's what I did: I removed the vent valve and found it choked with a fine dust. I cleaned the valve, but noticed that there was lots of dust in the tube running down to the charcoal cannister and realized the gravel filter in the vent valve is useless at stopping dust. I took out the cannister and discovered an amazing amount of dust clogging it up. I cleaned the cannister by holding it vent side down and sharply tapping it many, many times it while blowing air (at low pressure) through it toward the vent side until it passed air freely both ways. Did I mention that there was an amazing amount of dust that came out of the cannister? I would think that gasoline residues from overfilling might clog up the cannister too, but that didn't happen in my case.
Below are what I consider the possible causes of P0446 in the order of least likelihood (IMO) for a vehicle used in a high dust environment:
Electrical vent driver circuit in computer burned out (especially if the vent valve is shorted), electrical vacuum valve driver circuit burnt out, vent valve coil open or shorted, vacuum valve coil open or shorted, bad vacuum sensor in the gas tank, vent valve filter clogged with dust, charcoal cannister clogged with dust or residues.
Removing and replacing the vent valve and especially the charcoal cannister in a GMC truck is a major, major pain in the a-- because the entire vehicle was carefully engineered by GMC so as to make replacement as difficult as possible. It does no good cleaning and replacing a clogged vent valve as the cannister will be clogged too. A new cannister is about $175, but a cleaned one is free.
BTW, my vent test works perfectly now. Added by Protoart: If you have the P0446 code and the vent valve is bad, don't continue to drive, or you will clog (saturate) the canister with gas for sure. My wife's 05 Scion, check engine light w/ P0441,0442, and 0446.......cleared with my scanner, never came back after I tightened the gas cap
Evaporative emission system purge control valve circuit
P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
usually this means the gas cap is not on tight or is leaking
What does OBDII code P0443 Evaporative emission control system purge control valve circuit malfunction mean?
I t means you have something wrong with your emissions. Check the hose that goes from the Evap Valve (usually a round plastic valve) to Throttle body. Maybe is too soft and when there is a vacuum it clogges.
Answer P0442 evaporative emissions control system leak detected see "What are OBDII codes and their meanings?" you can also go to www.obd-codes.com for a list of several codes on different models hope this helps- steph
Large evaporative emissions vapor leak. Check gas cap and all hoses from the engine to the gas tank.
P0440 OBDII code is for evaporative emissions control system failure.. check your gas cap though, many times a loose gas cap is the culprit with this code, hope this helps some1 out.
Evaporative Emission System High Purge Flow. Relates to your vehicles OBDII compliant system for monitoring vehicle emissions.
OBDii code p0455 comes up which is evaporative emissions gross Leak no idea where to start looking your cruise control also stopped working when the light came on Have to smog truck next month?
Check every rubber hose from the engine to the fuel tank.
There is air escaping from the gas tank. Often a problem with the gas cap, try tightening the cap, reset the code and see if it comes back on. Essentially it is testing for cracks in the tank.
Trouble code P0445 means:Evaporative emission control systempurge control valve circuit shorted
The 0400 - 04## are all emissions related, can be caused by something as trivial as an improperly tightened gas cap or as complex as the EVAPORATIVE EMISSIONS CONTROL SYSTEM, which has a series of hoses, purge valve and charcoal vapor canister filter controlled by the computer. Older cars normally develop leaks in the hoses that can be determined using specialized leak detection testing, normally not for diy level of repair. Most of the 0400… Read More
P0446 Evaporative Emission Control System Vent Control Circuit. The most common cause is the gas cap left off and someone drove the car or the cap was not fully locked it will set the code. Some other causes are leaking evaporative emission plumbing from the fuel tank to the engine compartment, someone changed the fuel pump and did not seal it properly. Failure of a emission component in the evap system. The only way to… Read More
what does P0466 code EVAP Emission Control System Vent Circuit Malf. mean for a 1996 infiniti i30 Vehicle?
If it has a circuit malfunction, or is causing a misfire.
This code is defined as: Output Speed Sensor Circuit
Trouble code P0043 means: HO2S Heater Control Circuit Low (Bank 1, Sensor 3) Hex code 43 is for a misfire.
Mass or Volume Air Flow Circuit Range/Performance Problem
The 1997 Chevrolet Monte Carlo is equipped with an evaporative emission system. A purge flow fault can involve a number a single or multiple component problems. There could be a problem a with the purge valve which is relatively easy repair/replacement. The Monte Carlo's OBDII system should be scanned for all codes which will help narrow the condition.
( P0460 ) - Fuel level sensor circuit malfunction
IAT Sensor 1 Circuit High Input
In the drivers side footwell, be sure to check the emissions decal though to see if the vehicle is OBD or OBDII certified.
ummm...if you mean the OBDII it's located on the passenger side foot well. There is a concealed carpeted panel that pops off.
1723 indicates a/t control relay open or short
From the OBDII Code book: P0741 - Powertrain: Torque Converter Clutch Circuit Performance/Stuck Off
O2 sensor circuit malfunction, Bank 1 sensor 2. Check the O2 sensor after the catalytic converter.
P0449 says that the PCM is not seeing the voltage potential it wants to see when the vent valve is off or commanded on. I would suspect it is the Evaporative Emissions (EVAP) Canister Vent Solenoid near or on top of the gas tank is bad. To make sure check the voltage at the pink wire. It should be around 12 volts. If it is low, it may be bad wiring or the PCM, but… Read More
Here is P0000 to P0999 These are the basic codes for most vehicles. Buick doesn't have all these. If you get a code, you can check this chart to get a basic definition about your code. There is also higher code numbers above P0999,if you need those just let me know :) OBDII GENERIC DTC P0000 No Diagnostic Trouble Codes Found P0001 Fuel Volume Regulator Control -Circuit Open P0002 Fuel volume Regulator Control -Circuit Range/Performance… Read More
1. Take it to the dealer or repair shop. Cost? Depends on dealer/shop. 2. Take it to an auto parts store, such as AutoZone and ask to use their OBDII scanner, or have them do it. There is NO obligation, so you don't have to buy the parts to fix the issue if you're not ready. Cost? Free 3. Under the dash, usually on the driver's side, are green and black connectors. Connect the GREEN… Read More
P0340 is error code for Camshaft Postion Sensor Circuit Malfunction
This means the vacuum control solenoid for the EVAP is not working and needs to be checked.
O2 sensor circuit slow response. Bank 1 sensor . Suggest you check this out with a OBDII. can be done at Pep Boys.......
P0100 Mass or Volume Air Flow Circuit Malfunction P0101 Mass or Volume Air Flow Circuit Range/Performance Problem P0102 Mass or Volume Air Flow Circuit Low Input P0103 Mass or Volume Air Flow Circuit High Input P0104 Mass or Volume Air Flow Circuit Intermittent P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction range/performance P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input P0109… Read More
All vehicles made during and after 1996 use the OBDII standard but there are some proprietary codes for other than emissions systems, check out the site below.
The emissions on or flashing on 2003 Lincoln Navigator indicates a malfunction or error being reported by OBDII system. The code must be read through a computer reader and the vehicle checked by qualified technician/facility. Leaving such conditions uncorrected can affect everything from gas mileage to causing the expensive replacement of catalytic converters.
"EGR Vacuum Regulator Solenoid Circuit" is the "official" OBDII definition. What this means specifically to your vehicle will require some research on your part.
P1655 refers to the Powertrain Control Module fault (quad driver 2)
The Check Engine Light comes on when a performance or emissions problem is detected. The OBDII diagnostics need to be scanned to retreive the trouble codes to determine where the problem lies. AutoZone will scan for the codes at no charge.
There are hundreds of pages of electrical diagrams for the S-10 trucks manufactured after OBDII. Please ask a specific question about a specific circuit.
P0137 = O2 sensor circuit low volts (bank 1 sensor 2). Could be a faulty B1 S2 O2 sensor.
Your cars computer has detected a problem with one of it's systems, most likely emissions. Have the codes read by an OBDII scanner and it will tell you what is wrong. Many parts stores will read the codes for free.
In order to turn off the "Check Engine Light", you or a trusted mechanic check the Onboard Diagnostics (OBDII) OBDII uses a "code reader" which plugs into your car (usually in the dashboard, or near the radio...) and that tells you what "malfunction" is setting your Check Engine Light off. Basically, if there is a fault in any computer controlled system (fuel, ignition, SRS (airbag), emissions etc) the Electronic Control Unit (ECU) sends a code… Read More
OBDII stands for 'Onboard Diagnostics'
Code 42 points to the following problems in a 1998 Neon. It could be one or more of these issues. P1282 - Fuel Pump Relay Control Circuit P1388 - ASD Relay Control Circuit P1389 - No ASD Relay Output Voltage At PCM P0460 - Fuel Level Sending Unit & Circuit, No Change Over Miles P0462 - Fuel Level Sending Unit Voltage Out Of Limits, Too Low P0463 - Fuel Level Sending Unit Voltage Out Of… Read More
What I found was P1459 EVAP Emission Purge Flow Switch Malfunction It could be part of the vacuum circuit that purges gasoline fumes from the fuel tank.
If you are referring to OBDII trouble code U0001; It is a generic fault code (not manufacturer specific). It is an error detected in the Engine Control Module's Controller Area Network.
First off it is illegal to remove the converter. Secondly, your engine will not run properly with the converter removed. --- That's not entirely correct. It depends on whether your car is pre-1975, or ALDL, OBDI or OBDII equipped. Prior to about 1975, there were no converters on cars, generally speaking. ALDL and OBDI cars have oxygen (O2) sensors before the converters, and only measure emissions coming out of the exhaust manifolds. OBDII came on… Read More
The cruise control on a 2002 Mercedes ML320 will stop working if the fuse has blown or the wiring has become loose. An OBDII code reader can be connected to the vehicle's computer to help diagnose the problem.
If the check engine light is on... you might have an open circuit somewhere. Pre-1996 vehicles are not as easy to plug in and read as the OBDII cars.
Transaxle Range Sensor Circuit Malfunction (PRNDL Input) For a list of other codes, look here: http://www.troublecodes.net/Kia/ Scroll down until you see the heading OBD-II