Question about 1998 Buick Regal

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I cannot pass smog because of code P0446. The man at the diagnostic place said I would need a EVAP sensor, but I cant seem to find the exact name for what the EVAP sensor might be. Can u help me figure it out???

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  • Buick Master
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YOU NEED A FUEL TANK PRESSURE SENSOR OR EVAP VENT SOLENOID BAD.

Posted on Aug 31, 2010

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Whats the fix for gm code po101 p0113 p0446


Testing diagnostic's associated for the codes is how to find the fix. Assuming as to a fix would only be a guess . Your best bet would be to take it to a qualified repair shop .OR you could look on youtube .
P0101 GM Digital Mass Air Flow Sensor Diagnostics and Troubleshooting by...
P0113 OBD II DTC Engine Code for 2002 Chevy Trailblazer
EVAP Vent Solenoid Code P0446


Aug 09, 2017 | Cars & Trucks

2 Answers

What does code p0446 mean on a 2001 Buick Centry?


P0446 Evaporative Emission Control System Vent Control Circuit Malfunction 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 description of the fault varies between different car manufacturers, but one thing is common, the code P0446 doesn't directly point to a defective part; some testing might be required to pinpoint the faulty component. What can cause the code P0446: - faulty vent control valve - blockage at the vent hose, vent filter or vent control valve - open or short in the vent control valve circuit - bad charcoal canister - EVAP system leak - faulty EVAP system pressure sensor - bad vacuum switching valve (VSV) - stuck open purge valve (solenoid)

Aug 13, 2014 | 2001 Buick Century

1 Answer

Did not pass smog need help with error codes p0441,p0442,p0446


Some test should be about $25 and take about ten minutes once the car is up on the lift, after all it is just a diagnostic test to see if there any leaks. The car should be on the lift to check the EVAP piping all the way back to the tank. It is unlikely that the charcoal canister will need changing, they generally last longer than the car as they rarely wear out. The charcoal canister and the whole EVAP system merely absorbs fuel vapours rising of the fuel in the tank. When your engine is warmed up and doing more than 2,500 revs the EVAP purge and vent valves open to allow outside air to be drawn in through the canister to carry the small amount of trapped fuel vapour into the engine to be consumed as part of the normal fuel air mix. The computer normally commands the EVAP system to open and close the purge/vent valves check as part of an inbuilt leak detection protocol and has seen an anomaly, possibly the vent valve not closing properly. Once the nature of the leak is diagnosed it is matter of fixing it and it should not be an expensive or time consuming job. Take the car to other mechanics and get their opinion and guesstimates. Put it like this "would you smoke test my EVAP, fix the leak and clear the diagnostic trouble codes from my computer for $200 including taxes?" If the answer is no then ask how close they can get to this price.

Mar 01, 2017 | Lexus ES 300 Cars & Trucks

2 Answers

2001 chevrolet sububban po446,452,and 453 how do i fix my check engine light is on and i cant pass in spection


DTC P0446 - Evaporative Emmission Control System Vent Control Circuit
Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test. 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
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

DTC P0452 - Evaporative emission control system, pressure sensor low imput
DTC P0453 - Evaporative emission control system, pressure sensor high imput

The PCM monitors the EVAP control system FTP sensor input signal to the PCM. The test fails when the signal average jumps above a minimum allowable calibrated parameter. If both codes are present, it sounds like your fuel tank pressure sensor has failed.

The sensor is on top of the tank and you will have to remove the tank. But your symptoms are pointing to more than just the sensor. You may have wiring problems.


Hope this helps (remember to rate and leave a comment about this free answer).

Sep 30, 2011 | 1998 Cadillac Seville

1 Answer

I have an error code of P0446 when i ran a diagnostic on my 2006 G6. My car smells like gas but we looked it over and there are no obvious leaks or wet spots. Is it an O2 sensor or possibly a gas cap?


P0446 is Evaporative Emission vent system performance.

the smell you have is likely a tube/pipe loose at the evap canister (adjacent to fuel tank)

The two issues seem linked

Nov 23, 2010 | 2006 Pontiac G6

3 Answers

The check engine light stays on or comes back on when doing smog test. It passed everything on the smog test except check engine light. The indicator code is P0446.


Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
copyscape.gif Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes 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

Nov 20, 2009 | 1997 Ford Explorer AWD

1 Answer

Evap Sys Monitor


if evap is the only monitor that hasn't set yet, the car should still pass, a car is allowed to have 1 monitor that isn't set and still pass as long as the check engine light isn't on. take it in for the emissions, it should pass.

Jul 04, 2009 | 1997 Chevrolet Malibu

2 Answers

P0440, P0441, P0446


where is Evap Emission Control System Purge Flow fault

Jul 02, 2009 | 2000 Toyota Celica

1 Answer

Code p0446 1997 nissan maxima


how did you fix your p0446 code?

Apr 21, 2009 | 1997 Nissan Maxima

1 Answer

I like to now how to fix the code 0446 on kia optima 2001 2.4l engine. thanks


P0446 - Vent Control of the Evap System. This Evaporative Emissions System is very complicated. These particular DTCs (Diagnostic Trouble Codes) can be caused by MORE than they tell you. Three MAJOR components in the system can cause this P0446. 1. Charcoal Canister, 2. Charcoal Canister Filter, 3. Canister Close Valve, 4. Fuel Tank Pressure Sensor, 5. Purge Control Solenoid Valve, 6, Wiring and/or connector/connections between them and the ECU. If you wish to trust the computer's diagnostics, then replace the canister close valve (after you have inspected the Evap Charcoal Canister's air filter and find no problems with restrictions of air flow). If the problem comes back, check the Purge Control Solenoid Valve and the operation of the Fuel Tank Pressure sensor - either one of those components, if malfunctioning, can cause a P0446.

Apr 19, 2009 | 2001 Kia Optima

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