What does the code p0401 mean on a Chevy?
What does the code p0401 mean on a Chevy? P0401 CHEVROLET Meaning The Powertrain Control Module (PCM) tests the EGR system during deceleration by momentarily commanding the EGR valve open. The pressure in the intake manifold increases when the EGR valve is open. Can a p0401 code be removed from an EGR valve? If you have a P0401 code stored in the computer and have an electronic EGR valve but do not have a scanner to test it, you can still remove it and check for carbon stuck in the pintial of the EGR valve and even if the pintail...