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DieselPro 05-12-2005, 07:52 PM What's likely to cause this PO231 code? 96 Chevy automatic, new ops, & new relay. The SES light comes on for awhile goes off and might not reappear for days. Have customer with this problem. knkreb 05-12-2005, 09:21 PM Any translation in layman's terms as to what P0231 equals too?? That may help us a little bit. Maybe muffler bearings need greasing? Or adjustment of piston return springs? Sorry, I just had too. . . 69camarox 05-12-2005, 09:25 PM P0231 Fuel Pump Feedback Circuit Low Voltage knkreb 05-12-2005, 09:28 PM Engine ground? Passenger side head to firewall? quantum mechanic 05-12-2005, 09:31 PM Make a new ground wire to the frame for the LP if nothing else works. knkreb 05-12-2005, 09:53 PM I will check the FAQ's for codes. . . I will check the FAQ's for codes. . . I will check the FAQ's for codes. . . I will check the FAQ's for codes. . . 96 more times I'll remember next time. gmctd 05-13-2005, 09:03 AM If batteries show 13.6 to 14.2v, try the connectors in the main engine harness - PCM is main supply for lift pump in the OBD-II series. Resistive fuse can cause low voltage. That, and grounding, as mentioned above, which will also result in low voltage symptoms. | ||