This is a strange one for me. For the last little bit I've been having an issue where the radio, door locks, window switches, interior lights, and dash gauges would lose power. I would be driving down the road and they would all go off and I could hear a click. Then they would suddenly come back on and I could hear a click. Truck ran fine when they were off but I was always driving down the road when it happened. Well tonight I started the truck and all of the above mentioned items were off. I tried to pull out and could tell there was an issue, transmission seemed like it was in a higher gear. I turn my Torque app on and see that the trans is in 5th gear. Also the RPMs at idle were 847 which is a little high. I put the truck in reverse and it shifts hard into reverse. Put it back in drive and it shifts hard into 5th gear so the only gears that are working are 5th and reverse which I'm assuming are defaults like the old E4ODs when the their transmission controller wasn't working. I pull the codes and I get a P115A (low fuel, which it's not. I have half a tank), U0100, and a U0155 which are apparently from the instrument cluster not communicating with the PCM. I'm attaching some pics so you can see what I'm looking at. Some of the instrument cluster lights are working but none of the gauges are and the lights that light up the gauge needles aren't working. I've read on some other posts that a tuner could be causing this type issue. I'm running the 8K tow tune from Gearhead as my daily driver and have been for about 3 years without an issue so I don't see how this could be the problem but I'm gonna set it back to stock tomorrow and see what happens.
https://s33.postimg.cc/rf8c1ira7/truck1.jpg
https://s33.postimg.cc/4f1opftj3/truck2.jpg

 

I know this is a stretch, but most vehicle issues are ground or connectivity related. With this happening as you're driving, start by checking all the grounds. The frame to block, battery to frame and the accessory grounds for the wire loom. There are several throughout the wire loom that attach to the engine and firewall ground posts.

Good Luck

 

 

Not sure if this will be of any help but I recall a very similar situation with my truck. I have a 2005 f-250. Years back when it was under warranty (2006 prob) I was having an issue very similar to you with the exception I don't recall the transmission portion of it. Anyway it spent approx. 2 weeks at the dealership. Because it was intermittent they had a tough time getting it to happen, and then when it did happen they had a tough time diagnosing it before everything started working again. In the end they ended up replacing the entire instrument cluster. Haven't had the problem since. I had no tuner on the truck at that time.

 

Kind of a long shot, but one time I had an intermittent issue with my wipers not working and it turned out that the fuse was loose in its socket. When I wiggled it by accident to test it with a multimeter, it made the connection, and I figured the issue out. So if you can find a common link between these issues and what fuse they might be powered by, or what fuse powers the relay that controls these, try wiggling it or pulling it out and seeing if there's anything going on there.

 

 

 

 

When this happened to me it was the alternator changed it out problem solved, My headlights also flickered and I had 15vdc on my batteries. This also happened on a 2006 ford 500 that my daughter had.

 

I second the instrument cluster. My symptoms were the dash would go dead, the radio stopped working, windows would not work. I was also getting a warning that my door was open. The dome light would go on. Things would go back to working but there was no rhyme or reason as to why. Changed out the cluster with Circuit Board Medics and everything was fixed. Haven't had a problem since. I changed mine out a few weeks ago. Only took about half an hour.

 

 

 

We just wanted to chime in and see if we could help out. These instrument clusters do have a lot of issues and do cause a lot of various problems. The most typical issues we see are with the power windows, radio, and dome lights as well as the cluster intermittently losing power. We don't typically see issues with power door locks because that system is not controlled by the cluster. We also don't typically see issues with the transmission caused by the cluster; these trucks run and drive just fine without the cluster even installed (other than the fact that you will have a dead battery because the cluster is part of the circuit that controls the alternator). One of the more common issues that our customers run into that can cause some similar issues is a bad alternator. The voltage spikes from a bad alternator can emulate a lot of these similar issues because the cluster will drop out with the voltage spike. It can also affect other systems that the cluster doesn't control which could explain some of the other issues. I would try to monitor the alternator output while the issues are happening and see if it is spiking. If you would like to have the cluster rebuilt then we would love the opportunity to serve you in that, but my only hesitation would be the fact that you were having issues with the door locks and the transmission (though they could conceivably be caused by other things and the cluster does need a rebuild). Please let us know if you have any other questions or if there is any way we can help out further.

 

I'm having the exact same issue. The gauge problem has been nagging but hasn't been distracting enough to become a priority project. Yesterday was the first time I'd experienced the limp mode scenario. I let it sit overnight and everything functioned flawlessly this morning (aside from a check engine light). I haven't checked codes yet but wanted to dig into potential causes first so I wasn't just chasing codes that may or may not be accurate.

Dealership I bought it from said they'd just replaced the alternator so I doubt that's the issue.

Were you ever able to get this sorted out? Appreciate the help in advance!

 

I'd start your own thread if it were me. You'll get more traction that way.

-jokester