P0446 Code

P0446, P0442, P0441, P0440 CHEVY SILVERADO 1500 INFO. Any thoughts on a solution? It is an emissions code. kinglt1 Member As the title says: some might have an ses p0446, evap emissions vent circuit low. Pardon me, but this code. P0453 is Evaporative Emission Control. Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. this is for a 91 3 wire alt. I have made several corrections but no success in eliminating the code permanently (code returns after 4 or 5 days). Uplander - P0446 Code, EVAP Vent valve - So my check engine light came on and the dealer scanned and got the codes P0036 for the Second(downstream) oxygen sensor and P0446 for the EVAP system vent valve. The 2006 Ford Explorer has 1 problems reported for obd 11 code p0446. Fuel volatility is an aspect of fuel with advantages and disadvantages. The P0446 OBD-II code often triggers with other related EVAP codes (like P0441), and the specific combination of codes can give your mechanic a better idea of where the actual problem lies. Recently it has developed a P0446 engine code and CEL. 5 times the legal limit. Code: P0446 System: Powertrain (Covers functions that include engine, transmission and associated drivetrain accessories) Category: ISO/SAE (It is core DTCs and applied to most manufacturers. 75,000 ,miles. My 2010 Expedition's check engine light is on and is showing a code of P0446. If you have a 1998-1999 Solara or Camry P0440, P0441, P0446 trouble code issue, Toyota has issued a service bulletin # EG013-02 to address this problem. See here for a step-by-step guide on how to diagnose and fix check engine light code P0446. I was recently driving to town and my wifes van had its check engine light come on. Use it here. I have an 03 tundra v8 that sets a P0442 & P0446 code every spring. P1453 - ? P1420 - ? P0446 - Evaporation Emission Vent Control Circuit. Buick Rendezvous P0446 OBD-II Diagnostic Powertrain (P) Trouble Code Information Page. One of the most common trouble codes with the Chevy Silverado is the P0446 code. Codes: P0171, P0446. Is it costly to repair including labor and. Had it read at autozone, and it is P0446. Cause: Connected a scan tool and found codes: P0171 - System Too Lean (Bank 1); P0446 - Evaporative Emission System Vent Control Circuit; P0507 - Idle Air Control System RPM Higher Than Expected and P2187 - System Too Lean at Idle (Bank 1). I had the same code when I tried to register my truck (2003 as well) two or three years ago at a shop. all i know is it is for evap purge/vent. P0446 Evaporative Emission Control System Vent Control malfunction. the fuel tank, filler neck, and fuel cap). Going by subaru color cod. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. That is a part that allows the fuel system to make sure that the gas cap is on. I recently got the check engine light on my 06 Tahoe Z71 and I scanned it and got the P0446 evap system code. SOURCE: 2003 toyota Matrix code p0441 and p0446need help p0441 - Evaporative emission control system Incorrect purge flow. remove the sensor which is located on top of fuel tank remove the sensor and if wet then bad sensor. In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. What is that code. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). If you have a 1998-1999 Solara or Camry P0440, P0441, P0446 trouble code issue, Toyota has issued a service bulletin # EG013-02 to address this problem. 2011-2014 F150 - MIL On With DTC P0446 2011-2014 F-150 vehicles can exhibit a MIL on with DTC P0446. I am getting P0446 code. ) and finally the P0446, because of the stuck vent valve. RE: fuel filling problem and engine light (code po446) on a 2004 Chevrolet silverado 2500 HD? 2004 chevy 2500 hd, has a hard time filling the gas tank. If you take it to the dealer they want 300-400. I have an '07 G6 sedan 3. Any thoughts on a solution? It is an emissions code. this is for a 91 3 wire alt. Recently Popped this code on my 2006 Trailblazer I-6. 1999 Toyota Camry P0773 Code - Check Engine Light - FREE Car. SOURCE: 2003 toyota Matrix code p0441 and p0446need help p0441 - Evaporative emission control system Incorrect purge flow. My 2003 Vibe AWD has two CEL codes which are P0446 (Evaporative Emission Control System Vent Control Circuit Malfunction) + P0446P (Yes the same code with a P at the end :-s ). An inspection of the EVAP system we be necessary. Glad I was able to find it. Now in your case it’s going to be a little difficult to diagnose without a scan tool. If your car supports OBD II or EOBD, then you can already use almost 5000 generic OBDII codes. BAT Team Discussions for P0446. 'ON' DTC P0446 on some 1999 year ES 300's". It is a rubber hose that slips down over a metal pipe. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light). Each time I get it the engine is warm. I have had the P0446 Code for a while now. Saturn Vue P0446: EVAP Vent Control Circuit → Malfunction 700r4transmissionhq. NEW Are you tired of Losing your stuff? Are you tired of someone else losing their stuff? Now you can use your Wallet to Find Your Keys and Vice Versa! FOFA - XD! Our Patented 2-Way Wireless Key Finders. Recently it has developed a P0446 engine code and CEL. Anyone know what it is for? The code list shows codes P0445 and P0447, which are for the EVAP system so I'm guessing P0446 has to do with that system too?:confused:. Average repair cost is $280 at 115,000 miles. Trouble Codes Turn On Your Check Engine Light. Anything done to the car recently??? Both of these codes have to do with a problem in the evaporative system. I replaced my fuel cap and the code is still coming up. A very common trouble code with the Toyota Camry is the P0446 code. 00 to fix the problem. Tried to charge me $60 for a diagnosis fee when I knew it was just a loose gas cap. can be caused by a lot of things and is usually related to a small leak in the emission control evap system, try replacing the gas cap and see if it helps, if not, the system needs to be tested for a leak with the scantool or a leak tester or both. another of grandpa's failed legacy systems; it's all the last 100 years of purposely. I recently got the check engine light on my 06 Tahoe Z71 and I scanned it and got the P0446 evap system code. 2000 Chev Blazer 4wd 4. I also made sure my gas cap. It implies that you need to find an electrical fault with the vent valve.  Camry P0440, P0441, P0446 Diagnose and fix Camry P0440, P0441, P0446 trouble code. First posting, besides my intro. A gas cap shouldn't give you that code. First diagnose P0446 code. I've had the same Evap codes haunting me for too long now but I've finally won. I was recently driving to town and my wifes van had its check engine light come on. ) and finally the P0446, because of the stuck vent valve. Autozone scanned my '05 4. I got an OBD II reader and it gave me the code P0446. com and affiliated sites. BAT Team Discussions for P0446. I replaced the vent control valve, the purge control valve and the gas cap. It was the Evap system that was giving me the trouble code, what it turned out to be is a small spring-loaded check valve. buy or make an electric car lets hope we can win this latest electric vehicle battle so we never have to deal with this kind of nonsense again. replaced the evap vent valve, the one near the spare tire at the rear. In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register. Today I am going to educate you as to the functions and diagnostics involved in Evaporative Emissions issues and what the codes mean. 99 Camry 4-cyl Auto 124,000 miles. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". Repair Information for P0446 Chevrolet code. This time it hasn't gone away. Code P0446: Evaporative Emission Control System Vent Control Circuit Malfunction. P0446 Engine Trouble Code. P0100 Mass or Volume Air Flow Circuit Malfunction P0101 Mass or Volume Air Flow Circuit Range/Performance Problem P0102 Mass or Volume Ai. On the plus side, the better a fuel vaporizes the better it burns, which is why we burn gasoline and diesel in our vehicles instead of, say, wood or coal (though these can be used with sufficient processing). The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. This is a common code on the Solara and it is a known problem, like the sludge problem. We recommend Torque Pro. P0446 has come up here before a nuber of times, try searching for P0446 ijn post bodies, (not titles) a lot of reading. RE: fuel filling problem and engine light (code po446) on a 2004 Chevrolet silverado 2500 HD? 2004 chevy 2500 hd, has a hard time filling the gas tank. When the engine is running, the purge solenoid, located on the intake manifold of the engine, and the vent solenoid,. Each time I get it the engine is warm. Any information on how to fix this would be greatly appreciated. Meaning of P0446 engine trouble code is a kind of powertrain trouble code and P0446 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,200. the fuel tank, filler neck, and fuel cap). P0446 EVAP Vent Solenoid Valve Control System. TOYOTA AVENSIS 1999-2003 2. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. P0453 is Evaporative Emission Control. P0446 Evaporative Emission Control System Vent Control Circuit Malfunction Indicator. Rage drove me to it. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. anyone else get this code. Today the ML light came on and I have the P0446 evap code telling me something is wrong. My 2003 Vibe AWD has two CEL codes which are P0446 (Evaporative Emission Control System Vent Control Circuit Malfunction) + P0446P (Yes the same code with a P at the end :-s ). This trouble code references a number that is given to you when you plug your Camry into a OBDII scanner. The check engine light came on, I had the code checked and it can back as P0446: The PCM has determined that a malfunction exists in the electrical circuit for the vent control in the evaporative emission control system. com One of the most common trouble codes with the Saturn Vue is the P0446 code. CEL came on last week. kind of strange that the first code is repeated. P0446 Engine Trouble Code. The system checks when the fuel gage is between about 1/4 and 3/4 and needs to see similar pressures at both ends of the system. my check engine light is on because of this code. The TSB referred to here has you relocate the new vent valve towards the front of the box. Code P0446 relates to the Evap. The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e. I have a 2005 Chevrolet Silverado 1500 and the other day the engine light came on. 5-15v, then the PCM detected a short to ground, an open circuit or a short to power in the Purge control circuit during the test period. Connected a scan tool and found codes: P0171 – System Too Lean (Bank 1); P0446 – Evaporative Emission System Vent Control Circuit; P0507 – Idle Air Control System RPM Higher Than Expected and P2187 – System Too Lean at Idle (Bank 1). This code is set when the vehicle’s engine computer recognizes that there is a fault at the vent control of the EVAP. The P0446 OBD-II code often triggers with other related EVAP codes (like P0441), and the specific combination of codes can give your mechanic a better idea of where the actual problem lies. A few months ago I replaced the evap canister and purge valve for having the same code since I was also experiencing where the pump would click off a bunch of times while trying to fill the tank. ***2 year update, 04-2019*** , still no emission codes or check engine lights on my camry. the pump keeps shutting off, like it thinks the tank is full. Connected a scan tool and found codes: P0171 - System Too Lean (Bank 1); P0446 - Evaporative Emission System Vent Control Circuit; P0507 - Idle Air Control System RPM Higher Than Expected and P2187 - System Too Lean at Idle (Bank 1). I've just lived with it for the last two years, clearing the CEL when it came back. I got the same code p0446 and my scanner said it was the vent solenoid so I replaced it code came back. Uplander - P0446 Code, EVAP Vent valve - So my check engine light came on and the dealer scanned and got the codes P0036 for the Second(downstream) oxygen sensor and P0446 for the EVAP system vent valve. u might have a bad fuel tank pressure sensor. Today the ML light came on and I have the P0446 evap code telling me something is wrong. Check for the following:. i changed out the vapor canister purge valve and cleared the code. This code indicates the possibility of a malfunction in the vent control circuit of the evaporative emission control system (EVAP). Did buy a new gas cap from the dealer for $15, but no such luck clearing the code. Question: The engine light comes on and when I read the code I get P0446. As it turns out, the Fuel Tank Pressure Sensor was the culprit. Do they mean something in particular when they show up togheter? Is this any helpfull. Use it here. Check engine light came on yesterday. I tried not filling up the tank all the way, as I now always stop at the first click and don't 'top off' per other posts here. Trouble Codes Turn On Your Check Engine Light. I was recently driving to town and my wifes van had its check engine light come on. What is a Diagnostic Trouble Code (DTC)?. Check engine light came on and has the code P0446 for a 1999 Lexus RX300. In this video I bring you along as I fix this 2006 Chevrolet Impala that has a glowing check engine light with a couple EVAP. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". I have a 2000 Camry with 86,000 mi the check-engine light came on 4 days ago. Find the repair process of P0446 Saturn OBD 2 engine fault code. 99 Camry 4-cyl Auto 124,000 miles. Saturn Vue P0446: EVAP Vent Control Circuit → Malfunction 700r4transmissionhq. This indicates that a portion of the EVAP control system is no longer functioning properly. Cobalt - P0446 code on a 2006 cobalt - I noticed my check engine light came on, code reader brought up a P0446 which is a Evaporative Emission Control System Vent Control Circuit Malfunction. Use it here. This code is not associated with a bad gas cap or faulty EVAP Purge solenoid (on top of the intake manifol. The EVAP codes are pretty common for the 8th generation Corolla/Prism clone. So I checked the old vent solenoid by using a battery that I keep in the truck to jump start anyone that needs it. EVAP codes have plagued some of the 8th gen Corollas - can be tough to diagnosis effectively without the right equipment. Check engine light came on and has the code P0446 for a 1999 Lexus RX300. I had the same code on my jetta at about 85k miles. As it turns out, the Fuel Tank Pressure Sensor was the culprit. It often appears with other codes, such as P0420, P0441, or P0440. A few months ago I replaced the evap canister and purge valve for having the same code since I was also experiencing where the pump would click off a bunch of times while trying to fill the tank. Visually inspect the related wiring harness and connectors. for my 2008 Chevy cobalt. The TSB referred to here has you relocate the new vent valve towards the front of the box. P0446 is usually tied to not tightening the gas cap until it clicks a few times or a bad gas cap gasket (not holding pressure). Trouble Codes Turn On Your Check Engine Light. CEL came on last week. Had it read at autozone, and it is P0446. 2 days later, it throws the. i have codes read p0441,p0440, p0446, - These are usually associated with the hose behind the air filter box. It is a rubber hose that slips down over a metal pipe. The car runs fine but Im sure I wont pass Massachusetts state inspection. its time to wire in an alternator on my ej swapped hatch. Replaced purge solenoid vakve already and still have code. It is most likely your charcoal canister assembly. The Chevy dealer said the check engine light is related to the emission control system and that I could keep driving the car. Usual suspects are a blockage of the purge air line (clear the line by blowing compressed air through it), or the EVAP canister is blocked and has to be replaced. have a 99 gmc sonoma with 4. Auto parts store gave me a description of "EVAP Emission System Vent Control Circuit". Q: Evap P0446 trouble code My car has 131 miles. Rage drove me to it. It has come on intermittently in the past and then shut off itself. Greetings! I'd appreciate any help very much. Thanks again for your offer, I do appreciate it. If a malfunction is detected, a DTC will be stored in non-volatile memory. I fixed my 2000 RAV4 with this code. A very common trouble code with the Toyota Camry is the P0446 code. Hey guys, Getting code P0446 - fault in the Evap Emissions System Vent Control electrical circuit for a predetermined period of time. The Powertrain Control Module (PCM) sets the P0446 code if the vacuum decay rate is greater than a predetermined value. Do they mean something in particular when they show up togheter? Is this any helpfull. Hi, new member here. 4l L4 Vin S Std 2. As the title says: some might have an ses p0446, evap emissions vent circuit low. One of the most common car problems involves a faulty oxygen sensor. 1999 Boxster It threw a P0446 code today while driving. P0446 Engine Diagnostic Code. P0446 doesn't imply that you need to replace a part. The P0446 code is triggered by the ECU when a malfunction occurs with the EVAP control system vent control valve. P0446 Indicates that there is a fault in the evaporative emission control system. The vent box came with the solenoid so yes I have changed that as well. Christina Lewis Halpern, founder and director of All Star Code, talked to TechRepublic about her career as a journalist, staying true to her. This code indicates the possibility of a malfunction in the vent control circuit of the evaporative emission control system (EVAP). Code: P0446 System: Powertrain (Covers functions that include engine, transmission and associated drivetrain accessories) Category: ISO/SAE (It is core DTCs and applied to most manufacturers. Diagnostic Help: To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. I feel no difference while driving. This code is not associated with a bad gas cap or faulty EVAP Purge solenoid (on top of the intake manifol. Do they mean something in particular when they show up togheter? Is this any helpfull. This is the first in a series of investigations covering many states' top emissions-related codes. The Powertrain Control Module (PCM) sets the P0446 Cadillac code if the vacuum decay rate is greater than a predetermined value. Trouble Codes Turn On Your Check Engine Light. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". Today the ML light came on and I have the P0446 evap code telling me something is wrong. I finally got around to fixing my P0446 code. What are fault codes p0441 and p0446 and how do I fix them? Has any body else seen these?. Question: The engine light comes on and when I read the code I get P0446. I've recently started getting a P0446 code on my old 2003 LeSabre. Cause: Engine speed over 40 rpm, system voltage from 7. I had the same code on my jetta at about 85k miles. #02-06-04-037F: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Check Engine Light On (Replace Evaporative Emission (EVAP) Vent Valve Solenoid. Recently, on my 98 Boxster (mileage 90 K) the CEL came on and from my Durametric reader, code P0446, Porsche fault code 95 [shutoff valve activated / charcoal filter] was displayed. This indicates that a portion of the EVAP control system is no longer functioning properly. In my experience, most likely the evap. As it turns out, the Fuel Tank Pressure Sensor was the culprit. This is what I've done to try to fix the problem and. This solenoid valve responds to signals from the Engine Control Module (). Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. another of grandpa's failed legacy systems; it's all the last 100 years of purposely. Consult techinfo. P1128 - O2 Adapation bank 1 P1130 - O2 Adapation bank 2 P0446 - Carbon Canister Blocked / Full / Etc. That is something in the Evap. i scanned the codes and it gave me two codes. P0446 is Evaporative Emission Control System Vent Control Circuit Malfunction. Wifes calls me from side of road, said engine light on. 75,000 ,miles. S-Series General. This solenoid valve responds to signals from the Engine Control Module ( ECM ). If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. vent valve is stuck and not working. you may have a unique issue or even multiple problems. hi im not eric but maybe i can help. Cause: Engine speed over 40 rpm, system voltage from 7. The Powertrain Control Module (PCM) sets the P0446 code if the vacuum decay rate is greater than a predetermined value. Read the information in the pdf and decide if you want to replace it. 2002 Chev S-10 4X4. I was recently driving to town and my wifes van had its check engine light come on. A very common trouble code with the Toyota Camry is the P0446 code. Where would you guys start? [ ATTACH] First - I would check gas cap for proper tightness i. I would reset the ECM and see if the code comes back. Cost of diagnosing the P0446 CHEVROLET code. B2798 Auto Trouble Code. Car: 2004 Toyota Corolla 1. P0440 is a general EVAP trouble code indicating a problem with your Toyota Corolla's EVAP system. Usual suspects are a blockage of the purge air line (clear the line by blowing compressed air through it), or the EVAP canister is blocked and has to be replaced. Shortly after changing my MAF, I am pulling 3 new codes from my DME. It is most likely your charcoal canister assembly. Check for the following:. The most complete engine light resource online. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). The vent box came with the solenoid so yes I have changed that as well. I am reciving those two codes. what the title says put the code reader on and it says: P0446 Generic Evaporative Emission system vent control Circuit. OBD-II Code P0446 is defined as a Evaporative System Vent Control Circuit Malfunction The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e. Tried to charge me $60 for a diagnosis fee when I knew it was just a loose gas cap. I get it on my daughter's 2003 Toyota Camry LE, 2. It's P0446, not P0466 I reset it with my OBD2 Scanner, and for the time the car is running, it stays off. I have an '07 G6 sedan 3. Codes p0446 p0453 come up. Today the ML light came on and I have the P0446 evap code telling me something is wrong. The P0446 code is triggered by the ECU when a malfunction occurs with the EVAP control system vent control valve. If you have a 1998-1999 Solara or Camry P0440, P0441, P0446 trouble code issue, Toyota has issued a service bulletin # EG013-02 to address this problem. IANAM (i am not a mechanic :P) but P0446 usually means 3 things (according to google searches): I have the same issue with my 97 camry with 250k miles. Possible causes of OBD code P0446 Buick A code P0446 Buick 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. Now in your case it’s going to be a little difficult to diagnose without a scan tool. This is a common code on the Solara and it is a known problem, like the sludge problem. Possible causes of P0446 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. Vent valve are extremely common on the 1/2 and 3/4 tons. Mitch, I had a feeling that the gas cap wouldn't cure this code, a faulty gas cap useally sets DTC P0440, Evap large leak. The solenoid that allows air to mix in the carcoal canister is not working properly. Actron Diagnostics offers a code look up tool for your automotive diagnostic and scan tool needs. I've got a 2004 SSR, never had any problems everwent to get the oil changedall is well but check engine light came on soon aftertake it back to the oil Change place, they say "gas cap", they replace the gas cap and reset the code. Hi Folks So here's the background I have an 04 Crew cab with the I5. It implies that you need to find an electrical fault with the vent valve. u might have a bad fuel tank pressure sensor. Appears I'm 3rd in linemy 4Runner's CEL is also on for a P0446 code. But to prevent spending that much money on it, you should probably change the gas tank cap first, then work your way through the VSV's etc. A black with white tracer and a yellow wire. We currently have a lot of Honda codes and do have a standard OBD II code list so select your OBD on the right in the menu and everything is organized there. I have a 2000 Camry with 86,000 mi the check-engine light came on 4 days ago. Randy, P0446 is the code thrown when there is a problem with the purge air line from the EVAP canister to the engine is inoperative. 99 Camry, P0441 & P0446 codes I purchased a CanOBD2 code reader to see what the codes are so I can look into - Lexus 1999 ES 300 question. Hi all, Well I've had the Subaru on the road for a couple of days now after a total rebuild on the engine. If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes. 3l v6 that has code 0446. in any car in USA its at the back of the car near the fuel tank or on the tank. The Chevy dealer said the check engine light is related to the emission control system and that I could keep driving the car. Once or twice its simply been a loose fuel cap but now the cap seems fine (could it be worn and loosenot getting a good seal?). I got the same code p0446 and my scanner said it was the vent solenoid so I replaced it code came back. How or what do i do to fix this code. on my 05 crew cab I kept getting code P0446 so I used my actron Uscan tool and code connect repair says its my fuel tank pressure sensor is the most replaced part. I have a 06 impala 3. Do they mean something in particular when they show up togheter? Is this any helpfull. I feel no difference while driving. P0446 - GM; Type: Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled: Description: EVAP Purge Vent Valve Circuit Conditions. P0446 Engine Trouble Code. I know it could be the gas cap? Then where?. Page 2- P0446 Code? Trash Or Be Trashed. Randy, P0446 is the code thrown when there is a problem with the purge air line from the EVAP canister to the engine is inoperative. 2-Liter Gasoline Engine. NEW Are you tired of Losing your stuff? Are you tired of someone else losing their stuff? Now you can use your Wallet to Find Your Keys and Vice Versa! FOFA - XD! Our Patented 2-Way Wireless Key Finders. It has come on intermittently in the past and then shut off itself. These codes are from PowerTrain series (P0XXX, P2XXX, P34XX), Body Series (B0XXX), Chassis series (C0XXX), Network series (U0XXX, U2XXX, U3XXX). Possible causes of P0446 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. Cause: Engine speed over 40 rpm, system voltage from 7.