Sorry to ask. Limp home reduced power with PowerBoost

[Spiffy]

I have been searching a while. Lots of different threads going back.
This week while towing my PB 2022 3.5 my truck went into reduced power mode. Very frustrating going 30mph on interstate.
Anyway I was following a certain thread that was talking about the electronics of the heat exchanger. Not a leak.
The conversation matured to a viable solution but I can't seem to find the thread.
BTW I have had the CEL for months and no signs of leaks. I blew it off until I lost power.

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[HammaMan]

What are the codes? Did it tell you anything?

 

[Tiny Elvis]

BTW I have had the CEL for months and no signs of leaks. I blew it off until I lost power.

Dude - under warranty and ignoring a CEL? For months? The CEL isn't a decorative feature.

 

[Spiffy]

Only excuse I had was at the beginning of this problem it was reported that the repair was months due to parts availability, not knowing what exactly the issue was. When I first saw the CEL and pulled the code it was apparently the heat exchanger. Nobody including Ford had a concrete plan.
I did not have any adverse problems. I decided to wait it out until the dust settled.
My dealer told me at the time that my truck could potentially sit for extended time.
Now we know there is two issues. One is leaking and the other is erroneous data stream. Mine is the later.

 

[Spiffy]

Now can replicate the problem. Ford has experience with thus and the repair will be quick. I didn't want to be a part of a learning curve. But thank you for taking your time answering my question. Quite helpful. Ha

 

[Spiffy]

What are the codes? Did it tell you anything?

Oh I forgot to add that. I can't remember the exact code ATM but it was from the heat exchanger servo. You had a thread going about bypassing. I can't remember if you touched on fooling the computer. My dealer says expect 6 weeks to get it fixed and I need the truck interm. Only happens under towing mostly.
The other thing my shop said was the truck had to show the failure. It wasn't good enough to see the code. Makes me think they aren't up to speed yet.
As soon as I pull over the power resumes for 3 to four miles.
I can now replicate by coming in with my 12k job trailer attached.

 

[HammaMan]

Curious if the servo is going out / letting the door open to heat the loop up? The truck has temp sensors to see if the loop is heating up. The question is, can it see info from the servo or is it deducing it based on temp delta. Power shouldn't be pulled for servo error, but if the loop is heating up I can see that being a reason to pull power. Were you able to read coolant temps while this was going on? Did start to cook things? I couldn't see a reason for it to pull power unless heat was building.

I think the thread you're looking for is here
https://www.f150gen14.com/forum/threads/powerboost-exhaust-heat-exchanger-delete.16884/

 

[RickBullotta]

Oh I forgot to add that. I can't remember the exact code ATM but it was from the heat exchanger servo. You had a thread going about bypassing. I can't remember if you touched on fooling the computer. My dealer says expect 6 weeks to get it fixed and I need the truck interm. Only happens under towing mostly.
The other thing my shop said was the truck had to show the failure. It wasn't good enough to see the code. Makes me think they aren't up to speed yet.
As soon as I pull over the power resumes for 3 to four miles.
I can now replicate by coming in with my 12k job trailer attached.

I'm more impressed that you can stay under payload limitation on a platinum PB with a 12K trailer!

 

[Oxford_Powerboost]

The heat exchanger valve failure introduces too much heat into the system. Limp mode is due to getting to critical values. It’s a direct result of the issue you’ve been ignoring. Btw, dealers can see miles since CEL illuminated

 

[Oxford_Powerboost]

Curious if the servo is going out / letting the door open to heat the loop up? The truck has temp sensors to see if the loop is heating up. The question is, can it see info from the servo or is it deducing it based on temp delta. Power shouldn't be pulled for servo error, but if the loop is heating up I can see that being a reason to pull power. Were you able to read coolant temps while this was going on? Did start to cook things? I couldn't see a reason for it to pull power unless heat was building.

I think the thread you're looking for is here
https://www.f150gen14.com/forum/threads/powerboost-exhaust-heat-exchanger-delete.16884/

I had this exact issue. Coolant temp really was not an issue at least at the sensor that reads out on your dash, but there are temp sensors in the exchanger loop to track the delta between temp in and temp out and if that goes out of range I think that’s when you get the power reduced message. It shut down all boost for me. I could maintain a max of 55-60mph.

my dash reported as low as 219 coolant temp when I was in limp mode, which was pretty normal for my Powerboost on the highway

 

[Sojourner]

My heart stopped for a minute when I saw the thread title. I thought it was going to be the dreaded 6R80 lead frame disaster I had with my (now sold) 2012 3.5 EB XLT FX4. I thought, oh no, the 10R80s are having the same problem...?

Glad it wasn't that. Also hope the OP can get the issue fixed soon and done right.

Fingers crossed.

 

[Spiffy]

Curious if the servo is going out / letting the door open to heat the loop up? The truck has temp sensors to see if the loop is heating up. The question is, can it see info from the servo or is it deducing it based on temp delta. Power shouldn't be pulled for servo error, but if the loop is heating up I can see that being a reason to pull power. Were you able to read coolant temps while this was going on? Did start to cook things? I couldn't see a reason for it to pull power unless heat was building.

I think the thread you're looking for is here
https://www.f150gen14.com/forum/threads/powerboost-exhaust-heat-exchanger-delete.16884/

At least my normal coolant Temps were in the normal range.

 

[Spiffy]

The heat exchanger valve failure introduces too much heat into the system. Limp mode is due to getting to critical values. It’s a direct result of the issue you’ve been ignoring. Btw, dealers can see miles since CEL illuminated

I'm not concerned about them seeing the miles since the cel light. I dont knkw why you think om ignoring the issue. There is nothing in the warrantees that say how long I can drive with it on. Besides when I called about it and talked to service manager and gave him the code he said if I wasn't having issues don't bother to bring it in just then. He admitted that they didn't have the resources to fix it. I know the service manager. My brother.
Now it's becoming a problem. It used to be every time I towed a overweight load. Now it's happening on my 5k tool trailer.
I am now without my spair truck. 2016 f150 with yet another fucking cam failure. I'm trying to see if I can fix this my self. I can't be without a towing truck. They have plenty of cars to loan. All their trucks are non towing rentals.
I swear if Ford wasn't the only truck with door key pads I would buy something else.
But this one is pretty cool!!

 

[Qnitty2002]

I have been searching a while. Lots of different threads going back.
This week while towing my PB 2022 3.5 my truck went into reduced power mode. Very frustrating going 30mph on interstate.
Anyway I was following a certain thread that was talking about the electronics of the heat exchanger. Not a leak.
The conversation matured to a viable solution but I can't seem to find the thread.
BTW I have had the CEL for months and no signs of leaks. I blew it off until I lost power.

Had this happen on my 2021 f150 5.0. They replace the gas pedal. No problem since the fix

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