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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 12-09-2004, 09:52 AM
freejack freejack is offline
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Engine Failsafe mode

I have a '04 F150 SCrew Lariat 4X4 with about 8400 miles on it. This morning I started the truck, pulled out of my driveway and got about 100 feet down the street when "engine is in failsafe mode" popped on in the message center. I turned around and pulled back into my driveway, and turned off the engine. After a few seconds I started the truck again and everything was normal. and I had no problems driving to work (about 20 miles). The only info I can find is that this is supposed to happen if the engine overheats. It was about 50 degrees outside (california winter weather) and the engine hadn't even had a chance to warm up (temp gage was still below the "C"). Has anyone had this happen to them, and found out what could have caused it? I'm trying to find out anything about this before I end up having to take it to the dealer.
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Old 12-09-2004, 02:36 PM
dtupac dtupac is offline
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dealer replaced my throttle position sensor after the second time it occurred, first time they flashed the computer with the update. worked fine for about a week and same problem again. with the tps replaced i've had no problems with the engine since. if i recall i think my light turned off after i restarted it, mine came on just shifting into reverse both times.
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Old 12-09-2004, 10:00 PM
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Matthew Koser
failsafe mode will happen whenever the computer senses a sensor out of tolerance.
There is probably a code stored, I would have them check it out. Probably just a laze o2 sensor,
MK
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Old 12-09-2004, 10:51 PM
dtupac dtupac is offline
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the sensor was bad, i.e. inoperative. and there have been other people with the throttle position sensor issues, hopefully there won't be one starting with the o2 sensors now
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Old 12-09-2004, 10:56 PM
fordguy61mi fordguy61mi is offline
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Just take it to the dealer and they'll know how to fix it. There has been plenty of this problem going around. Mine did it and I took it in and they replaced the throttle body and re-flashed my module and I haven't had any problems since.
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Old 12-29-2004, 09:26 AM
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I took the truck to the dealer and the tech told me that ford doesnt have a bulletin on this problem, but they did state that this is a "rare anomaly" (after I mentioned the throttle sensor) and they ordered a new sensor to install.
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Old 02-09-2010, 02:20 PM
cmc53 cmc53 is offline
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Failsafe Mode? And problems after TSP replace

Dealer replaced TSP and continue to have problem of engine failsafe mode initiating on the road. Any secondary fixes to be aware of?

Also, anyone else have engine failsafe mode bad experiences? The failsafe seems very dangerous as the whole vehicle shuts down sometimes and that includes power steering. Re-engaging the engine also requires turning key off, which temporarily disengages power steering.
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Old 02-09-2010, 02:53 PM
marshall99f150 marshall99f150 is offline
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Either a bad flash in the PCM or a bad PCM or a bad TPS.
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Old 02-09-2010, 03:08 PM
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Holy thread revival Batman! Back from the dead after more than 5 years!

Great use of the search feature cmc!
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Old 02-09-2010, 04:33 PM
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my truck went into fail asfe during the test drive.

it stalled at a stop light, then after i restarted it went into failsafe.

dealer installed a new throttle body. been great ever since.
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Old 02-09-2010, 07:45 PM
fordguy61mi fordguy61mi is offline
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No kidding! The post I made a few before this one was 12/10/2004! I haven't even owned that F150 truck for a few years now! hahaha
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Old 02-09-2010, 08:41 PM
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Wow...what else might we find in the time capsule? Yes it was a magical, simpler time when little was known about global warming and even less was known of the dreaded spark plug issue.

My Edge would sometimes send my rig into failsafe on level 3. Had to do with PCM interpreting MAF sensor readings from my Volant and the programmer not remembering my wheel diameter and gear ratio. Wasn't that bad, just a loss in thrust until I could safely pull over and set everything back to stock.
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Old 02-10-2010, 01:57 PM
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Dealer suggests the Same

Thanks, the dealer has suggested the same and having it replaced today.
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Old 02-10-2010, 01:57 PM
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