Q: EGG code p0400, multiple cylinder misfire, removed and cleaned egr and pipe with no change

asked by on

Egr code p0400 muktiple cylinder misfire, removed and cleaned egr and pipe with no change My car has 195000 miles.
My car has an automatic transmission.

Hi there. The P0400 EGR (exhaust gas recirculation) valve code may not be a valve not working. This code description is a EGR flow malfunction. The fact that your vehicle has multiple cylinder misfires leads me to believe the valve may be stuck partially open.

Try removing the EGR valve and blow through the passage. If air flows, replace the EGR valve. If no air flows, it may be a control issue. This would require a scanner to monitor parameters and circuit tests to be performed. I recommend having your vehicle’s EGR code P0400 be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. EGG code p0400, multiple cylinder misfire, removed and cleaned egr and pipe with no change

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

Get a quote

What others are asking

Q: Car runs like crap at idle and cold once heats up runs better also says it misfiring on all cylinders

It is possible that diagnostic trouble codes have set and a mechanic should attempt to retrieve those first using an appropriate scan tool. If there are no trouble codes, if you were to request a diagnostic from YourMechanic, the protocol...

Q: Q: Clicking sound

If you are only getting a clicking sound then you will need to first check to make sure you did not get a dead battery. Turn on the head lights and key on and blower on high to see if...

Q: An EGR valve has an error and my engine is stalling out when started.

Hi there. Check the power to the Exhaust Gas Recirculation (EGR) Valve and see if there is a voltage reference. If there is a voltage reference, then back probe the EGR Valve wiring harness plug with the engine running and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...