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Technical  Po401

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Technical  Po401

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Chas

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Joined
Feb 1, 2008
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Location
Salford
Hi
There is a PO401 low voltage detected on the car.
What exactly is giving the low voltage? My thoughts are with the ECU as there is no direct connection with the 12 v side of things. Any Ideas?
Chas
 
Have you tried googling the code? P0401 points to EGR valve, may need cleaned or replaced
 
Hi
Yes,I know that,but where does the low voltage come from. Is it the 5v from ECU, or 12v from main system.
I have two different descriptions of this fault. One is the low voltage and the second refers to low vacuum.It seems to depend on which diagnostics are used.
Already changed the MAP sensor, but not solved problem.
Chas
 
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