crippin123456 Posted March 15, 2012 Report Share Posted March 15, 2012 Getting service fuel system and code pco231 won't start ive replaced pump filter and also fp relay.pco231 means circuit voltage feedback.so what do i do about it. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted March 15, 2012 Report Share Posted March 15, 2012 P031 means that the voltage to the fuel pump isn't three when the fuel pump filter is activated by the PCM. It means, in likelihood of being the problem, that the fuel pump relay is bad, there is a short in the line from there to the fuel pump, or there is another problem in the wiring harness like an open circuit out of the fuel pump relay or in the feedback test line that throws the code. The fuel pump filter has four terminals and can be inserted upside down. Make sure that the graphics on the top are right-side-up looking from the front of the car. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Ranger Posted March 16, 2012 Report Share Posted March 16, 2012 P031 means that the voltage to the fuel pump isn't three when the fuel pump filter is activated by the PCM.The fuel pump filter has four terminals and can be inserted upside down. Huh? You're gonna need to explain this one Jim. http://www.obd-codes.com/p0231 Link to comment Share on other sites More sharing options...
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