Hi new to the forum, but someone suggest I try here for some help.

As the title says, my truck is a 2016 6.7L Powerstroke with only about 57k miles. Sorry for the long post, just seeing if anyone else has experienced anything like this.

A few weeks ago, my wife pulls up to the launch ramp to retrieve the boat, as she's waiting in line for whatever reason she decided to turn the truck off, when she goes to turn it back on it won't start so she flags me down, I tie the boat up to the dock and walk up. The truck has the autoseat adjustment, so as soon as you put the key in, the seat will move to your set position and when you take the key out, it moves back (I am sure you all know how that works) anyway, I put the key in and notice right away the seat isn't moving, turn the key and nothing happens, stereo comes on, dash lights up, no warning or anything but when you turn the key nothing, doesn't crank or anything. I sit there for about 5 minutes turning key back and forth, then all of sudden it fires up like normal. Get the boat out and go home.

Since then it has started fine, but a few times when I would start it, the windshield wipers would cycle even though they were turned off, once they even got about halfway up and stopped in the middle of the windshield.

This weekend on Saturday I drove it to the carwash then on the way back while coasting on a slight downhill to a red light, the truck just turned off, no sputtering, no warning lights, stereo stayed on, but engine just shut off. Luckily I was going slow, coasted to a stop, put it in park, and it fired right back up. Drove it straight home. Saturday evening I drove it around the neighborhood trying to see if it would shut off again, and it didn't worked just fine.

Sunday morning started up fine, drove to my moms house, visited for about 2 hours, hopped in truck to leave, and it did the same thing it did at the boat launch, turn the key and nothing happens, seat doesnt move, stereo comes on, but engine wont crank. Get my dads voltage meter and both batteries read about 12.65 so I didn't think batteries. Kept turning key hoping to get lucky like I did at the launch, but nothing is happening. For ****s and giggles and hook up a jumper box to the passenger side battery, nothing. So then I hook the jumper box to the driver side battery and turn the key and everything fires up like normal. I drive it home and park it. Sunday evening I load tested the batteries and they both test out fine, hooked a scanner up and there are no codes. Drove truck around, turned it off and on a few times and everything is fine.

Going to take it to the dealer, but if there are no codes and I can't get it to replicate the issue, not sure if there is anything they can do.

Has anyone had this happen?

 

Did you load test the batteries outside the truck? The batteries are wired in parallel, so one good battery can cover for a bad battery. Any corrosion on the battery terminals? The water levels in the cells of each battery are OK? All connections are tight?

It could be a bad solenoid on the starter.

 

Load tested in the truck but disconnected. Batteries looked clean.

 

Are these the original batteries?

On another forum I'm on, the phrase most often mentioned when odd electronic things happen is, "It's always the battery." The electronics in these modern trucks are finicky and don't perform well when the voltage is out of spec.

When you get a no start condition, check the voltage at every point you can, starting with the batteries.

 

My truck has similar issue where the seat will not move into position and the wipers will engage 1 cycle when started, but I want to say this may happen once or twice a year so it's extremely intermittent. I have new batteries and a new alternator replaced earlier this year and had these symptoms occur since then. Its so intermittent that I forget about it until it happens again

 

In the 2011-2016 Ford Super Duty; another culprit is the harness that is attached to the parking brake mount. There is a large plug connector that over time, will vibrate a bit loose from the vibration of releasing the park brake. Check that, un-plug it, then re-plug making sure it is fully seated. Then remove harness from park brake and re-attach it elsewhere.
Good luck.

 

The batteries were replaced in 2019

I have been reading about issues with the connector near the parking brake, a connector near the spare tire, and also with the ground/power cables from the batteries....before this issue I wouldnt have known that there are so many little issues with this truck, not to mention the big issue with the CP4

 

Bad/ poor ground can and does happen with ANY modern vehicle that everything is controlled by electronics. A little corrosion in just the wrong place will cause it. And then funny stuff happens. Check ALL grounds. Every ground strap connecting something to the frame. Not just the cable at the battery. Check for corrosion inside the insulation on the battery cables.
The funky connection back by the spare is primarily in the 2017 and newer trucks.
It seems as though every model has their own idiosyncracies.
CP4………BUY CLEAN FUEL…..KEEP IT CLEAN. There are a lot of trucks out there with no issues what-so-ever..

 

Truck has been at the dealer now for a week and they can't seem to find the issue.

On a side note they did the emissions recall while it was in there, but now reading about it on a different thread, not sure I wanted them to do it?

I love the truck, but I am seriously starting to regret the purchase...seems like so many issues to worry about...my last GM gas truck went 280k miles with no major issues...just add gas, do oil changes, few minor things like alternator and water pump...now I am seeing people on here suggest that there should be a diesel test kit to test the fuel before putting into your tank...wtf?

 

There are folks that can’t sleep nights due to worrying about SOMETHING…….if they didn’t have their diesel to worry about, they would be worried about their dog, or cat, or gas burner! Butg since they are natural born worriers and they have a new $60-$80K diesel truck, why not worry about that! I have been around diesels for most of my 75 years; ag, oil drilling, trucks, industrial equipment of various kinds and have actually seen very few failures. Hope you can get straightened out and enjoy.

EDIT: PS, go back to dealer and have him check the big wiring harness attached to the park brake mount……unplug the big connector and then re-plug it in, making sure the connection is all good. If that fixes it, move the harness to a different location so it doesn’t get shaken every time the park brake is released.

 

During all this did you try a spare key? Did the security light come on or start flashing?

 

Thanks for the reply, yeah I try not to worry about anything and most my worries come from the site when I came looking for answers for my problem, if my truck just had intermediate starting issues, I wouldn't be too worried for the most part....but when it just completely shut off on me while driving, that has me a little nervous.

 

Unfortunately my wife lost my spare key so I currently only have one key. That being said, there were no security lights or anything flashing.

 

issues coupled with difficulty in getting service appt's in the NYC area.

 

So as expected, after two weeks at the dealer, they called me this morning and said they can not replicate the problem and there are no codes, so there is nothing they can do, and asked me to come pick up the truck. So now I get to drive this truck around not knowing if or when it's going to happen again...smh

If I drive it off the lot, onto the freeway, and the truck shuts off at 75mph and causes a wreck....who is responsible for that? Most likely me but