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07 Expedition - P0231.

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This truck would stall. It might restart quickly... or it might wait until you had it towed. Meaning if you began testing stuff, you had no way of knowing if you were testing something while it was still broken or if you were "fixing" it by testing it...

 

With a P0231, both Hotline and the PC/ED had us checking the fuel pump monitor circuits along with the fuel pump relay and such. Finally, by the grace of Yahweh, the divine prophet Mohummdaddy or the great googly moogly (pick one) the failure stayed with me for a while.

 

Long enough to find out that the concern was between the fuel pump and the inertia fuel shutoff switch... a failure that SHOULD have set a P0232 - NOT a P0231.

 

After the repair (which turned out to be an unlatched connector at the left C pillar), I tripped the IFS and, sure enough, the resulting code was a P0231... again, a P0232 would be the expected code...

 

Intermittents are hard enough to catch, most times... even more so when the manual has you looking at stuff not involved in the failure....

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