Q: Check engine light is on with code P0440. Also the car makes noise

asked by on October 12, 2016

Check engine light is on with code P0440 and the car makes noise. What should be done to fix it?

My car has 165000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

Hi there, thanks for writing in. This code is for a leak or failure in the evap emissions system. By far the most common cause of this is a bad gas cap. If the seal on the cap is bad then this will occur. It can also be caused by a leak in any number of the parts contained in the system I usually will do a smoke test of the evap system to identify any leaks or any valves that are not closing. Those would need to be repaired and the system reset to fix this. The cost will really depend on what is wrong with the vehicle. If you would like help having this P0440 code repaired, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the check engine light for you and repair this.

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

Knocking noise coming from the crankshaft

The cylinder heads are one part of the complete engine package. As such, when they are rebuilt, other critical components such as connecting rods, bearings, pistons and cylinder sleeves are not replaced. If your head gasket broke, causing water to...

Front Axle Clanking Sounds

The front axle joints may be bad and binding from worn out ball bearings in the constant velocity (CV) joint. You may also have wheel bearing and ball joint issues and possible struts. All these could be possible causes of...

When the AC is turned on my Check engine light comes on , code reading throttle position sensor, not enough voltage.

If you have the electronic type throttle that has no cable to the throttle body, then you will need to check to make sure that battery voltage is not dropping below 12.5 volts when your A/C is turned on. You...

Driver's side CV joint noise

Hi there. The sound is more like a differential sound that is making a click sound. There seems to be too much free play on the gear train inside the transmission. This is determined by only the sound occurring when...

Hello, my battery died in my car last night I replaced it got home and now it won't start. Starter or alternator? CEL on now also

Hello, thank you for writing in. With full battery power, the battery may still be struggling to use that voltage and it may not be providing enough amperage to the starter. You should have the battery tested at an automotive...

Oil pressure light won't turn off

Hello. There could be an oil leak somewhere, or a problem with the car’s oil pump not working properly. It is also possible that the new oil pressure sensor that you just put in is defective and needs to be...

No gears in the transmission. I have a 545RFE transmission.

Hi there. First check the transmission fluid and make sure that it's full and red in color. Then check the harness to the transmission shifter position sensor and see if it's connected. There is a pressure relief valve in the...

AC blowing out warm air again

If this happened right after the work was done then you either have a leak in the system that allowed the refrigerant to come out or there is an electrical issue. It is possible that this was overlooked if the...

2011 Dodge Avenger Transmission

Hello. The most basic way to put it is the 3rd and 4th gear are slipping. What was your concern when you had the car diagnosed? Was is just the Check Engine Light, or did you notice a problem with...

Related articles

P0298 OBD-II Trouble Code: Engine Oil Over Temperature Condition
P0298 means that the engine is or has recently overheated due to low coolant level, faulty cooling fan, thermostat, or radiator.
P0270 OBD-II Trouble Code: Cylinder 4 Injector Circuit Low
P0270 P0270 code definition Cylinder 4 Injector Circuit Low What the P0270 code means This diagnostic trouble code indicates that the powertrain control module has detected a lower reference voltage from the fuel injector on the number 4 cylinder than...
How to Troubleshoot a Clicking or Popping Sound in Car Wheels
Car wheels make popping or clicking noises due to faulty CV joints, worn struts or drive belts, loose hubcaps, cupped tires, or loose suspension.