Skip the auto shop - Our mechanics make house calls

Q: Car stalls and P0401 insufficient egr flow

asked by on

When in Drive, my car tries to stall and sometimes does stall and tries to move forward. It stops once it has warmed up and driven several miles. There was a P0401 insufficient egr flow, but I removed the egr valve and it’s cleaned, plus also checked the intake manifold & it’s clean and we replaced the vacuum hose. Then I ran a wire down the egr pipe and it’s clear too. When this problem first happened, I thought it was the tranny and I went to an auto store where they told me the car was getting P0401 and that it should be fixed. Tried a 2nd auto store and they said the same, to get it fixed. More details for you: Within a month, after removing the fuel injection body, I cleaned out as I got a code for the position sensor on that - solved that. I used a synthetic oil to perform an oil change, as I’ve done other times too. Also a month ago, I replaced the spark plugs. I’m out of a job right now, so I need to find a way to fix this myself so I don’t have to ride my motorcycle in 100 degrees to go to job interviews. Please, can you tell me how to fix this stalling problem?

The P0401 code is for low EGR flow, but would not be the cause of the stalling if the flow was too low. You also state the problem is when the engine is cold and goes away after it is warm. The EGR system does not start working until the engine is warm.

It sounds like you are having a problem with the transmission or torque convertor. Have a mechanic that knows transmissions check the vehicle when it is cold to see if the engine or transmission is the problem. Sometimes the transmission seals will leak internally causing these problems until the fluid warms up. If you want to have this checked, a technician can diagnose your Check Engine Light and stalling issue thoroughly to determine what repairs will resolve your car problems.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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. Car stalls and P0401 insufficient egr flow

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: Van stalled, ABS and brake lights went on, couln't be restarted

It sounds like your alternator may have failed. It is the alternator's job to power the electrical system while the engine is running, as well as keep the battery charged. If the alternator has failed, the battery will now take...

Q: What is causing my warning lights to come on?

Your battery and charging system will need to be tested to see if the alternator is charging correctly. The alternator is most likely the cause of your Charge Light and Battery Light coming on. You should replace the alternator after...

Q: My car is cranking but not starting - 2003 Chevrolet Malibu

Hi there. If you've kept the vehicle in storage for five years and it was not started during that time, it's possible that the fuel inside the tank has gone bad. Gasoline, like anything that is refined for use, has...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...