Q: Engine light on code P0401

asked by on February 01, 2017

Engine light on with code P0401 EGR flow problem. EGR tube has been cleaned and ERG valve replaced but light back on. Don't know what to do next?

My car has 80000 miles.
My car has an automatic transmission.

Exhaust Gas Recirculation/EGR Valve Replacement $144.81 - $884.51 Get a Quote

Assuming that the passageways, including any through and within the plenum and intake are truly completely clear, there is likely a problem with other EGR system components. On your vehicle, Diagnostic Trouble Code P0401 involves not just blocked passageways and a defective EGR valve but also could signify problems with the vacuum hoses, wiring, and connections to the EGR valve, the control solenoid, the EGR air control valve, or the EGR temperature sensor. All of these components have to be individually tested to find the fault. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an EGR system diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

I'm having a problem with arcing from the plug wires.

The problem you are having is not due to the ignition system but is a result from an improper amount of fuel getting into the cylinders. If your engine is running lean, then it may cause the engine to not...

My engine is slightly knocking. I need to replace oil pump. Will it be worth replacing? Will the engine be okay after replacment?

It is very likely that the engine could be bad based on the sound. Most likely the oil pump going out caused other damage. On an older vehicle such as a 1992, the cost if an engine replacement may exceed...

Window not going back up

The cause of your window not moving is either a faulty window motor, or faulty regulator. If you hear a noise when you try to move the window, then the regulator is broken. If you do not hear any noise,...

Check engine light came while driving. Is this a serious problem? car seems to be running fine. 2004 Hyundai SantaFe

Hello - the Enhaust Gas Recirculation - EGR - system reduces emissions by recirculating exhaust gases that are not completely burned back through the engine. This is done in a timed manner under certain conditions. If this system is not...

SUV rear end has roaring, grinding noises

Hello. The way to fix this problem is to replace the rear differential with a new one. You could also have the existing differential rebuilt in order to stop the problem. Another option would be to replace the damaged differential...

If I accelerate my heat blows hot....idle speed blows cool and overheats if at an idle

The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater...

Can disconnecting your car horn cause your car battery to drain over night?

A horn being disconnected will not cause the battery to get drained. The battery being drained or low on charge after sitting should first charge and test the battery then check to see if the vehicle has a draw on...

What does the code P0150 mean?

Hi James. Thanks for contacting us today. I would recommend reading these two articles - first on the P-0130 OBD-II trouble code and second on the P-0150 code to learn more about these codes.

My 2010 Hyundai accent stalled out. now it wont start back up.

The check fuel cap light is telling you that there is an air leak in the fuel tank or lines. It's possible that a vacuum line has come off under the hood for the evaporative system. this could also cause...

Related articles

How to Replace an EVP Shut Off Solenoid
An EGR valve is essential to the EGR system in your vehicle. For this valve to work, the EVP shut off solenoid must monitor its position and function.
The Best Used Cars to Buy If You’re a Caterer
If If you are in the catering business, you need a reliable vehicle that will provide you with what you need to transport your food, linens, and other supplies. Generally speaking, you're better off buying gently used, because you will...
How to Replace an Exhaust Gas Recirculation (EGR) Vacuum Modulator
The EGR vacuum modulator meters the EGR valve in some car systems. Some signs of a failing EGR vacuum modulator include stalling and a rough idle.