Random Fail Safe
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Senior User
Joined: Apr 2003
Posts: 205
Likes: 0
From: Los Angeles, CA
Random Fail Safe
2005 5.4L F-150 SCrew Lariat
So a couple of months ago, on my way to work early in the morning, my truck randomly went into Fail Safe on the freeway. Then, a couple weeks ago it did it again, and a week later one more time. It does it randomly and usually when i take my foot off the accelerator. If I pull over, and restart the truck, all is fine and the problem goes away. My Edge does notify me of 3 DTC though:
P2104 Throttle actuator control system - forced idle
P2111 TAC system - stuck open
P2112 TAC - stuck closed
Anybody else having these issues or know any possible fixes? I'm well out of warranty, so taking it to the dealer is a last resort.
So a couple of months ago, on my way to work early in the morning, my truck randomly went into Fail Safe on the freeway. Then, a couple weeks ago it did it again, and a week later one more time. It does it randomly and usually when i take my foot off the accelerator. If I pull over, and restart the truck, all is fine and the problem goes away. My Edge does notify me of 3 DTC though:
P2104 Throttle actuator control system - forced idle
P2111 TAC system - stuck open
P2112 TAC - stuck closed
Anybody else having these issues or know any possible fixes? I'm well out of warranty, so taking it to the dealer is a last resort.
Tuned
Joined: Dec 2004
Posts: 312
Likes: 19
From: SoCal
Have you searched for a TSB yet?
Technical Service Bulletins: 2005 F-150
If none of those fit your problem, it sounds like a throttle body or TPS problem. I'd suggest checking the throttle pedal assembly for any problems in the cab, hopefully a loose connector could be found at a cost of zero. Failing that, inspect all the moving parts in the engine compartment for any stiffness, lubricate where necessary.
If it still happens, replacing the TPS is the next step I'd try.
Good luck,
Technical Service Bulletins: 2005 F-150
If none of those fit your problem, it sounds like a throttle body or TPS problem. I'd suggest checking the throttle pedal assembly for any problems in the cab, hopefully a loose connector could be found at a cost of zero. Failing that, inspect all the moving parts in the engine compartment for any stiffness, lubricate where necessary.
If it still happens, replacing the TPS is the next step I'd try.
Good luck,
Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
Run your truck on the stock tune and see if you can replicate the problem, this way you can take the edge off the list of possible causes. You might also try updating your edge with the fusion software. Edge improves the stock level settings from time to time. My truck will sometimes go into FS as well, but its usually because I was messing with the settings.
Senior User
Joined: Jan 2009
Posts: 328
Likes: 1
From: Top Of The World, TN
I had the same problem on my '04 a couple of times shortly after installing the edge. Same codes as well. I cleaned the MAF senser with Q D contact cleaner. Cleaned the Throttle body with a lint free rag and some carb cleaner (did not pull the TB). Cleared the codes. It has been fine for about two months now.
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