HV Battery Warning/Immediate Engine Shutdown

[charliecbp]

I have a 2021 job1 PB Limited with 28,000 miles, while driving the 1000 mile trip from South Florida to my North Carolina Cabin, at about the 750 mile mark my truck flashed a “HIGH VOLTAGE BATTERY WARNING” and “POWERTRAIN MALFUNCTION/REDUCED POWER” and at there same time the engine immdeiately shutdown while running at about 75 MPH on the I95. I was able to get on the road shoulder and turned the ignition off and checked a few things and the truck restarted, I drove maybe 100 more miles and same problem occurred. I was able to restart the truck again and get home with another shutdown the next day and get the truck to a Ford dealership.

I can’t believe that Ford has an immediate fault/warning/ shutdown strategy that shuts the engine off without even a 1 minute reduced power warning to get out of harms way.

The Dealership here told me that they haven’t worked on or seen many (if any) PB engines, I’ve researched this problem and have seen it occur on a few other PB trucks but don’t see much about a remedy.

Any one experienced this and had it repaired??

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[m_bt54]

I went through this and had my truck in the shop about 9 months. They replaced the HV Battery, BECM module, the main wiring harness that connects pretty much everything together, the high voltage fuse box (twice) and finally the high voltage harness which seems to be what fixed it. I have a thread that outlines most of my ordeal on here. I have been meaning to get around to scanning and posting my last printout from the shop.

As a bonus they also broke one of my tail lights and scratched up one of my doors, both by mistake and those were repaired as well.

In addition to your case you have open with your dealership, I would also open one with Ford customer service and request a buyback even if you don’t currently want that. It will help keep things moving for you and might even get them to extend your warranty as a courtesy.

 

[m_bt54]

https://www.f150gen14.com/forum/threads/wont-start-stop-safely-now-u0412-p0563-p0adf.24531/

This was where I documented it if interested.

 

[charliecbp]

https://www.f150gen14.com/forum/threads/wont-start-stop-safely-now-u0412-p0563-p0adf.24531/

This was where I documented it if interested.

Thanks for the info, I am going to start "another" case with ford and demand a buy back, I had problems a few years ago and was able to negotiate an extended warranty, the truck is 1000 miles from home now, I needs to be fixed.

 

[travisN000]

I have a 21 job 2 that has did similar at similar milage while in my neighborhood leaving for work in the AM. Both times I pulled over, turned off the truck, opened / closed the door to fully power off, and then was able to continue driving. Dealer didn't find anything at follow up, and this hasn't happened again with just over 70,000 miles on it now. Hopefully its just a false alarm

 

[charliecbp]

It happened to me 4 times in 2 days, all 4 time on the interstate at 75 MPH with no warning, 3 times the truck restarted and the 4th time it wouldn't restart until after about 20 minutes.

I have no confidence in the truck at all, dealer can't find anything, says to take the truck and see if it happens again, I have a case going with Ford hopefully this can be resolved

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