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

What others are asking

My check engine light came on

You can try and have the throttle body and idle control valve cleaned first and code cleared. If the code returns then you will need to have the computer program updated for this code. There is a technical bulletin #13-FL-005....

Car making a dragging noise

You may have a brake issue or a wheel bearing issue. Either of them may cause a dragging noise. Attest drive and visual inspection will narrow down what is causing your issue. I would not recommend driving the vehicle. A...

After starting SUV, 4 indicator lights come on

There are several reasons that this could happen. A system voltage dip or spike can cause all of these systems to illuminate their indicators or a fault that compromises the drivability of the engine such a mass airflow or oxygen...

Having trouble with trouble code P0455.

Hi. Trouble code P0455 is for the emissions system of the car and the only effect it will have on the car is the fuel economy may go down slightly and the car will pollute the air a little more....

Rough idle when in drive..but idle is fine when in nuetral or park

Hi there. Check for vacuum leaks on the engine. A small leak will cause the engine to stumble when the rpm's are low, like in gear on automatic transmissions. Look around the intake manifold for the gaskets being broken. Check...

P0128 code, but coolant is full

This is most likely caused by the thermostat partly stuck open. The coolant sensor would need to be tested to make sure it is not bad, though. I would test the thermostat at the housing with a temperature tester, and...

How do I stop my transmission from slipping?

This suggests low transmission fluid or possibly a faulty transmission control module. A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various sensors such as vehicle speed sensors,...

Heat Won't Blow at Floor

There is an actuator that controls the vent doors inside the system that open and close to direct air flow. When this is not working properly, this can improperly engage different vents intermittently or sometimes not at all. I would...

After 'check engine' light, diagnostic revealed P0171 and P0402

The first code, P0171, is an indication the engine is running lean. This code can indicate anything from clogged air and fuel filters to problems with O2 sensors and mass air flow sensors to intake gaskets. The other code,...

Related articles

P0592 OBD-II Trouble Code: Cruise Control Multi-Function Input "B" Circuit Low
P0592 means that the PCM has detected a fault in the cruise control input circuit, often due to a failed cruise control switch.
P3460 OBD-II Trouble Code: Cylinder 8 Deactivation/Intake Valve Malfunction
P3460 P3460 code definition The P3460 code represents what’s known as Cyl8 Deactivation/Intake Valve Ctrl Circ Low. Cyl8 narrows the issue down to engine cylinder number 8. Other codes in the P3400 series may present concurrently with P3460, indicating a...
P2006 OBD-II Trouble Code: Intake Manifold Runner Control Stuck Closed Bank 1
P2006 trouble code definition The P2006 code is a generic OBD2 diagnostic trouble code relating to the intake manifold runner control circuit....