P0446 Evaporative Emmission Control System Vent Control Circuit
OBD-II Trouble Code Technical Description
Evaporative Emission Control System Vent Control Circuit Malfunction
What does that mean?
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.
There will be no obvious symptoms to driver, other than Malfunction Indicator Lamp (MIL) illumination.
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
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
Related P0446 DTC Discussions
- P0421,P0446,P0401 2003 hyundai santa fe 2.4 engine
160k miles, car is sputtering on acceleration and cruising rough. Had a timing belt put on about a month ago and it ran fine, put new spark plugs in , but didn't help the way it runs. Any ideas?...
- P0446 evap code issues.
Hi I have a 2001 Pontiac Sunfire SE coupe and the trouble code that came up is P0446 which is an Evap system control code I have manually both visually and physically inspected all the lines, checked the gas cap, and anything that connects to the fuel tank and I can not find any cracks, chips, or an...
- 1997 Toyota Camry LE 4L error codes P0441 P0446 P0450
So today I went for a drive and my engine light was on and I took it to advanced auto parts to get the code reading. From my research of these codes so far, it could be a huge range of issues from the gas cap being loose to replacing the pcm. I was wondering if anyone could help me with a place to s...
- 2002 Toyota Echo P0440, P0441, P0446
I just went to get my e-test done and when my car started the check engine light came on. Test showed the trouble codes P0440, P0441, P0446. It is a 4 door, 2002 Toyota Echo, 1.5L L4 DOHC 16 valves VVT-i, FWD, 5 speed manual transmission. I changed the engine air filter and oil last week, and the ca...
- P0440 after a p0446
For weeks I fought with a P0446 code. Last weekend I replaced the fuel tank pressure sensor..... no more 446 but then twice this week a new code appeared the p0440. What should I be looking for now....never had that code until I replaced the tank pressure switch....
Need more help with a p0446 code?
If you still need help regarding the P0446 trouble code, please post your question in our FREE car repair forums.
NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected. If you want to share this article or information with others, please link to this page, don't copy and paste it elsewhere.