Q: EGR valve and vacuum

asked by on February 17, 2016

The Check Engine Light is on. According to Advanced Auto, it shows that the EGR valve and EGR vacuum modulator may need replacement or to be cleaned.

If you got code P0401 for the EGR system malfunction, then the system would need to be tested to see whether or not the vacuum modulator valve is holding vacuum and can control the EGR valve. These tests are needed to see if the valve and modulator are good or not; the EGR tube could be in need of cleaning. If all this is done then a proper diagnosis can be given. I recommend having a mechanic, such as one from YourMechanic, run a diagnostic to see if your EGR vacuum modulator requires replacement, or if another path of repair will be necessary.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

2010 Dodge Caliber the lightning bolt comes on while driving or at a stop sign and my car then starts to putt or jerk I had the throttle changed it was a rinky dink car mechanic so I don’t know if he replaced it correctly and also when I add coolant it tends to leak the next day but also my car acts quicker with the lightning bolt and stalling whenever I add coolant

2008 Saturn Vue bought recently. Now I’m experiencing vibration below my vehicle after hitting a certain speed with check engine light on.

My battery died and I can't get into my car with the keys or get into the hood.

You should have the ability to manually unlock the door with the key to get into the vehicle and pop the hood latch. If not, you may wish to schedule an appointment to have an expert from YourMechanic come to...

When my car is in drive, and I am at a stop light, foot on brake, the car rocks back and forth. it happens after a complete stop.

Hi Colton. Thanks for sending in your question. The cost of repairs would depend on what's causing these symptoms. In some cases, it's due to debris being stuck in the transmission, that can be removed by flushing the transmission fluid...

Where is the emergency brake located at on the Cadillac Escalade ESV 2009

Hi There, Your emergency brake should be located down to your left under the dash and should have a small foot pedal to press it with. It should look almost like a very small brake pedal.

Low fuel pressure

Hello. If your vehicle is displaying low fuel pressure then it may be possible that there is an issue with the fuel pump. There are instances where a worn out fuel pumps will still operate but provide lower fuel pressure,...

My heater and airconditioner quit blowing out air.

Although the blower motor might not be running because a fuse blew, the problem is fuses usually blow due to an electrical malfunction in the circuit such as a short. Fuses are simply "protection devices" and when they blow it...

My car Roaring when I accelerate

Hello. Thanks for writing in. To begin, we need to identify what kind of noises you are hearing. Does it sound like a squeak, ticking, grinding, or tapping? Vehicles will make different noises when the engine is cold. Sometimes these...

Rear brake clicking noise after putting on a set of shoes and drums.

Hi there. Check the hardware to the shoes and see if the springs are sprung. A loose brake return spring will cause a clicking sound as its touching the drum when the brakes are applied. If the springs are the...

Related articles

P0087 OBD-II Trouble Code: Fuel Rail/System Pressure - Too Low
P0087 trouble code definition P0087 is Fuel Rail/System Pressure - Too Low, indicating a fuel system problem. This code is similar to...
P0612 OBD-II Trouble Code: Fuel Injector Control Module Relay Control
P0612 code means there is an issue with the fuel injector control module often due too a bad fuel injection relay/fuse or poor electrical connection.
P0243 OBD-II Trouble Code: Turbocharger Wastegate Solenoid A Malfunction
P0243 code definition Turbocharger Wastegate Solenoid A Malfunction What the P0243 code means P0243 is a generic OBD-II code indicating that the...