Just picked the truck up from Bickford Ford, Snohomish. Their diagnosis and repair: "40203 high pressure oil pump fitting coupler failure test drove vehicle to get to op temp, let soak for 15 minutes, engine would not start. performed hard start/no start sheet test 1-8, found P2291, also found TSB#08-9-9, performed air pressure check-found air leak noise from both valve covers, removed both cover and oil rails to perform under valve cover air leak-nothing obvious was found, perf. high press oil pump test-passed, removed high press oil pump cover found bubbles aroudn stc fitting while air pressure testing, perf STC repair, perf air press test after repair-passed. reassembled, test drove-let soak for 15 minutes-engine started right up. cleared codes, re-drove no codes. NOTE: while getting engine to op temp found a 39 degree difference between ECT and EOT and coolant overflow from degas bottle. Failed oil cooler 9.50 found TSB#08-11-3 installed pressure tester on cooling system, performed test...oil cooler failed. replaced oil cooler per TSB, flushed cooling system....passed... use op-codes 08113A, 08113B, 08113F"
The way the service guy explained it, due to the oil cooler failure the engine was overheating (which my gauge never showed). The computer then would shut down the engine and not allow it to start so it wouldn't cause any damage. All no charge except my $100 deductible. They also did a complete oil change, fuel filter etc service since it was time anyway and they had to drain the oil...
Looks like m-chan68 was spot on with the "The falls exactly under the Ford's TSB 08-09-09 category", "I am willing to bet my life that the high pressure oil pump STC (Snap-to-Connect) fitting has blown off the high pressure oil pump outlet:" and the "P2291 code".
"Eddie would go..."
2005 F-250 Superduty XLT short-bed
6.0 diesel crew cab 4X4
Sinister upgraded EGR kit
Performance Machine coolant filter kit
...other than that, bone stock