I encountered the same problem, my engine fail safe mode light came on and shut the car down. I took my car to my mechanic and he found the solution to the problem. The car needed a throttle body cleaning and the fuel filter needed to be replaced. After having my truck serviced my mileage increased from 14.6 mpg to 15.4 mpg
ENGINE FAILED SAFE MODE WARNING LIGHT, GONE Total cost $86.45
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It mean that the PCMreceived a bad reading from one of the sensors
most common fix would be
Either a bad flash in the PCM or a bad PCM or a bad TPS
go to the dealer and have them fix it
only the dealer can flash your PCM
also have them check the throttle body
and be cairful when they get that code they have a tendency to just stall out
thats strange....it sounds like total fail management mode.... try reseting it by disconnecting the battery for 5 mins , and retry ... one problem known is the starter pig-tail per TSB - 06-19-14 but thats for a NO-START.... check for basic fuel and ign. ...this will be hard due to diag requires a scanner.... all else fails you'll have to go to the dealer/shop for further diag.... hope this helps... or get back to me for what you tried and the outcome......GL
My 06 expedititon just had the throttle body replaced at 52,000 miles, car would go into safe mode but you couldn't drive it.. always on the freeway - that is just really safe! had to park it... kill it and restart it, to be able to drive!