PPOB "Unavailable"!

[Gimme_my_MME]

OK, that would be great. Hopefully there are some codes related to PPOB. If anyone can help I'd much appreciate it. Thanks
1FTVW1EL7PWG57477

GFM3 P2EA7:13:AB DC/AC Converter 'A' Input Voltage Too Low

SOBDMC U352B:00:2F High Voltage System Interlock Circuit 'H' Low

Among others. Whatever you used that showed no DTCs was not accurate

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[dmd3home]

Wow! That was fast. Yes, I figured the OBDII scanner I had wouldn't see PPOB related problems. Thanks.

DC/AC converter "'A' input voltage low?? Wouldn't that imply the converter isn't seeing the HVB voltage? The truck drives fine with no indicated problems so I think the HVB is good.

High Voltage System Interlock Circuit 'H' Low? Hmmmm, contactor maybe?

And others?

Well, I did manage to get an appointment at the dealer for tomorrow morning, so hopefully this will help me at least be better informed. Thanks

 

[Bandit216]

Definitely post the dealer's findings. I've had the same problem for my '22 Lariat for a few weeks.

 

[dmd3home]

Indeed I will!

 

[chl]

GFM3 P2EA7:13:AB DC/AC Converter 'A' Input Voltage Too Low

SOBDMC U352B:00:2F High Voltage System Interlock Circuit 'H' Low

Among others. Whatever you used that showed no DTCs was not accurate

The Circuit H Low error seems to mean the low voltage monitoring signal has a wiring problem:
indicating "a potential break, disconnect, or short in the high-voltage safety infrastructure" according to a search result at:

https://www.fs1inc.com/blog/dtc-u3529-high-voltage-system-interlock-circuit-h/

However, you don't have the other serious symptoms it mentions on that page.

The other one means "the power module responsible for converting high-voltage or low-voltage DC power to AC for your onboard outlets is detecting an insufficient supply voltage on its input side."

This could be a bad 12v battery or a wiring issue but with both issues...

Both of these sound to me like a bad wiring issue from the HVB to the inverter, which was the problem in one of the links I posted above - the wiring harness had an issue.

Of course it could be a wiring issue or connector issue anywhere down the path from the HVB to the inverter(s).

I think they also could just be a bad inverter which might produce both issues.

Sounds like it'll be a Ford fix, alas.

Hopefully they have a protocol for detecting if the Inverter is bad - replacing the wiring harness seems like a bigger job.

 

[Tired Lizard]

Rear HV Jct Box to Inverters:
https://www.f150lightningforum.com/...s-2-4-kw-but-240v-available.36781/post-684040

 

[Gimme_my_MME]

Indeed I will!

So what do they say?

 

[dmd3home]

So far not much. I will call them again today. I took it in on Wednesday morning and got a call from them that afternoon saying they'd have to take the truck bed off for further diagnostics. I believe the 7.2 kW inverter is under the bed so they need to get to it for testing.
One of my primary complaints about a dealership is you very rarely, if ever, get to talk to the actual person doing the work....always there is the service writer interpreter who may, or may not, give you an accurate description of the actual findings. I'll keep you posted.

 

[dmd3home]

The latest is that they have diagnosed the problem as the HV wiring harness and junction box going to the 240v inverter. They said they had to lift the bed to get access, but didn't have to remove it completely. They tell me the parts are readily available, should have them early next week, and can hopefully complete the work next week as well. This sounds great! I hope it all holds true.
It is a bit baffling that the wiring harness could go bad....the truck has never been offroad or even been in the rain (believe it or not, it's only got 1500 miles on it....I really purchased it for the PPOB). What goes wrong with wires? I suspect then that it is a manufacturing defect and probably actually in one of the connectors...maybe a pin pulling loose? It was funny though that it was working fine through a 4kW load for about 5 hours, I shut it down but later that day I tried to use it again but it immediately said "PPOB is Unavailable", before I even went to the PPOB screen. You'd think it would have stopped in the middle of using it. I'm just thankful they found the problem and it's quite fixable (I hope), and, it's still under warranty!

 

[Gimme_my_MME]

Rodents

 

[dmd3home]

Not rodents here....always garaged and rodent free!

 

[chl]

The latest is that they have diagnosed the problem as the HV wiring harness and junction box going to the 240v inverter. They said they had to lift the bed to get access, but didn't have to remove it completely. They tell me the parts are readily available, should have them early next week, and can hopefully complete the work next week as well. This sounds great! I hope it all holds true.
It is a bit baffling that the wiring harness could go bad....the truck has never been offroad or even been in the rain (believe it or not, it's only got 1500 miles on it....I really purchased it for the PPOB). What goes wrong with wires? I suspect then that it is a manufacturing defect and probably actually in one of the connectors...maybe a pin pulling loose? It was funny though that it was working fine through a 4kW load for about 5 hours, I shut it down but later that day I tried to use it again but it immediately said "PPOB is Unavailable", before I even went to the PPOB screen. You'd think it would have stopped in the middle of using it. I'm just thankful they found the problem and it's quite fixable (I hope), and, it's still under warranty!

That is was what it was in one of the links I posted too.

There have been some instances of the wires getting damaged by parts of the frame - behind the clove box, and this place under the bed in the other post mentioned, the cover on the wiring was clearly cut by something under the bed in a couple places:

Glad they have the parts.

Wiring, including connectors, needs to be better protected than some of the things we've seen in posts on the forum.

Not much we can do about hidden wiring under the bed though.

I did add some electrical tape to the wire bundle behind the glove box as was mentioned in a post:
https://www.f150lightningforum.com/...hile-driving-pending-fix-48.33583/post-631084

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