Q: P0449 vent solenoid valve low circuit

asked by on January 15, 2017

I tested the vent solenoid valve off the vehicle with a 12v power supply and it makes the clicking noise. With the solenoid on the vehicle and a snap on scanner hooked up when commanding the solenoid on/off no clicking. There is power going back to the harness to the pink wire and nothing to the white with the key on. How do I test if it's a bad wire or Driver in the computer

My car has 70000 miles.
My car has a manual transmission.

If you are getting codes to the vent solenoid and cannot command it open with the scanner then you need to see if scanner said it is open or closed. Then test the resistance of the solenoid for specified resistance. If not within specifications then replace valve and retest to see if it can be actuated. If no actuation then you have to check resistance of wire from computer connection to valve and if it is good then the computer will need to be replaced with a new valve.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

My car has a low idle and will stop at lights or stop signs

Hello. The symptoms you describe can be caused by a few different things. A few other possible causes are issues with the idle air control valve, with the transmission, or with the throttle position sensor. The idle air control valve...

Oil in coolant.

Oil in your coolant is a bad sign. This usually indicates a leaking head gasket or cracked head. A cooling system pressure test and block test will be able to determine this. I suggest having a qualified technician, such as...

Radiator keeps blowing coolant back into holding tank

Hi, thanks for writing in. This is a sign that you may need to have the radiator system burped. This is a process that is used to relieve the air in the system which can cause the coolant to overflow...

4l80e transmission in limp mode

Hello and thanks for your question. When changing out the transmission and ECM from another vehicle to your vehicle with the same year and model can effect many things. Check all plug to ensure that everything on the transmission is...

Is it better to just change trans fluid instead of flushing the whole system?

When it comes to vehicles over 5 years or 60,000 miles, my preference is to drain the transmission through the pan and replace the filter, especially if the transmission has never been serviced. The sales pitch is of course that...

What is causing a loud sound every time I step on the gas?

There are many different things that may cause an engine to struggle such as low fuel pressure, dirty or leaking fuel injectors, a failing or dirty mass air flow sensor and many other possibilities. Low fuel pressure will cause the...

Engine began knocking after oil ran low

Unfortunately, hearing an engine knock is not a good thing. Hopefully, you were able to shut the car engine off as soon as you heard the knock. It may be a long shot but one tip you can try first...

my car makes. a loud thumping noise when I step on the gas

Hi there. It is possible that you may have damaged a CV joint or steering system component when the pole was struck. It is also possible that the wheel was bent which could cause this type of thumping noise as...

Do strut bearings wear out? If they are worn out or bad, will it cause further damage if I continue to use the car?

Yes strut bearings will wear out. The first signs of worn strut bearings is the steering may jerk when turning at low speeds or parking maneuvers. As the bearing gets worse you will start to notice the steering becoming noisy...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Silverado Hybrid
If If you’re looking for a half-ton pickup truck that also gets great gas mileage, look no further than the 2012 Chevrolet Silverado Hybrid. While it has the towing and carrying capacity you’d look for in any regular truck, it...
2012 Ford F-150 vs. 2012 Chevrolet Silverado: Which One Should I Buy?
When you’re ready to really get some work done, there’s nothing like a full size pickup truck. These trucks are ready to haul a big load and really get in there and get busy. SUVs are great for moving people,...
2012 Chevrolet Traverse vs. 2012 Toyota Highlander: Which One Should I Buy?
Large SUVs are a huge and broad market, with a range of different offerings from economy to luxurious. The majority of the SUVs and crossover SUVs offer decent gas mileage, plenty of room for friends and family to ride along...