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EGR P401 Code - Scanner Tool / ELM327 commands -

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New User

Feb 17, 2013, 11:57 AM

Post #1 of 2 (1650 views)
EGR P401 Code - Scanner Tool / ELM327 commands - Sign In

197k Miles

I've been working on this car for a few weeks now, trying different things to fix the P401 code (insufficient EGR flow). So far, I've replaced the EGR valve, cleaned the passages as best I can, removed the intake manifold and cleaned everything I could, removed the exhaust manifold and cleaned out a ton of carbon deposit. I put it back together and drove it 1.9 miles, and the check engine light came on again, same code.

I then purchased a scan tool from, and hooked it up to my laptop. The software shows me the Intake Manifold pressure, but it does not have the functionality to command the EGR valve to open. It does have an ELM327 interface terminal to send commands to the PCM directly, so I'm hoping that someone will be able to help me find the code to enter into the terminal to command the EGR valve to open, so I can see if the engine stalls.

Does anyone know where I can get the ELM327 code to command the EGR valve to open?

Or, Does anyone know of a good software tool that will have that function built in?

I know you can do it by jumpering the terminals of on the EGR valve itself, but the connector is made in a way that makes it almost impossible to do it without stripping the wires.

I appreciate any help! Cheers!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 17, 2013, 2:22 PM

Post #2 of 2 (1628 views)
Re: EGR P401 Code - Scanner Tool / ELM327 commands - Sign In

The cars computer has to have that test built into it. If it does, it will be under functional tests.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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