PO231 Code,and PO603 code - Power Hungry Performance Forum

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PO231 Code,and PO603 code

1999 to 2003 7.3L Power Stroke Diesel
7.3L Power Stroke Diesel equipped Super Duty and Excursion.

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Sat, September 11th, 2010, 05:18 PM

jerry edwards jerry edwards is offline

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PO231 Code,and PO603 code

PO231 comes up with Secondary Fuel Pump Circuit Failure,and PO603 comes up with a back up for the second fuel pump.Since there is only one fuel pump,i checked into it and it was supposed to be a bad relay,is that possible?If it is possible,does anyone know where it is?

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