Squeak/Chirp going in to electric mode

[Wolverine7]

I had a similar problem last fall that was a bad exhaust heat exhanger extender valve. There is a system that switches in coolant flow for conditioning the battery pack when not running the engine. It also tends to squeak more when "cold", and much harder to hear when it's been running a while. An alternate way to prove to yourself it's not the transmission, brakes, etc. is that it can also happen when the truck is idling in the garage. Just give it a load (air conditioner, laptop plugged in, etc.) so the gas engine charges the battery and then switches back to battery only.

Dealer replaced this valve and no more squeaking when going to 0 RPM.

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[PlanoLee]

Was any of that covered by the factory warranty or powertrain? Seems like a common failure

 

[ryanc111]

Was any of that covered by the factory warranty or powertrain? Seems like a common failure

All of my work was covered by warranty . . . once the parts finally arrived.

 

[Wolverine7]

My extender valve work was also covered by warranty. Took a couple visits for the technician to hear it and figure out what it was, but once they identified it was covered.

 

[Ford Motor Company]

Ryan,



Did those 2 repairs do the job? Cause i stated getting the squeek and the lurch, at 29k miles on my 2021 powerboost. The squeek about the first 5 minutes of any drive that it switches to electric only,And the lurch, usually after 20+ minutes of driving when I come to a stop. Scared the crap out of me the first time it happened, bumper to bumper in a drive thru and my truck jumped forward for no reason (my foot was on the brake) and made a loud clunk.

Good morning! Go ahead and send us a private message with your VIN and dealer info, and I’ll look into this squeak concern. Thanks!

 

[Estoniancalgarian]

Here’s a weird one for you guys . . . I’ve recently noticed a squeak or chirp from my Powerboost periodically. It’s fairly muted but I can hear it with the windows up. It doesn’t sound like something is rubbing or grinding, it’s only one chirp and frankly I’m not overly bothered by it. More just curious. The sound seems to be coming from the left and behind the driver - at first I thought it was suspension related - perhaps the springs on my RAS springs on the rear.

After paying attention to it further I realized it wasn’t suspension as it didn’t happen when I was doing anything that was stressing that (i.e. braking, turning, bumps, etc). I believe I’ve narrowed it down to only happening when the truck switches to electric driving. At least that was the correlation when I started driving home from work today but about 15 minutes in to the drive it stopped making the sound at any time.

I’ll continue to monitor to verify the correlation and see if I can establish more of a pattern (just until something warms up? truly intermittent? something else?) but thought I would post here to see if anyone else has seen something similar. . .

I have been experiencing this exact sound as well. It’s been driving me nuts. My family members think I’m crazy lol.

 

[eharri3]

So the other day while letting my 21 PB XLT and do its thing in e mode to keep the radio going while I wiped it down I heard what I'm fairly certain was the heat exchanger valve chirp the last time the ICE shut down. First time it happened in over a year since I got it. And it started after the truck did not move for 48 hours then idled For about an hour.

No CEL or other issues. Truck hadn't been turned on for 48 hours before this. It is our family hauler and road trip vehicle. But I have a company car so other than vacation time it at most gets short hops on weeknights to run errands. Maybe 45 minutes to an hour highway time every couple or few weeks if we visit family or I hit up my gun range.

I made it a point to turn it on and take it out for at least a little bit every day since then and Over the last 3 days the chirp got quieter until it's mostly gone. I started her this morning after sitting all night and she was Dead silent slipping between modes. I am mostly not hearing the chirp anymore and it's become very faint when I do. Couldn't get it to do it at all today.

I don't know if the actuator is gradually going bad or if something was starting to seize up that I loosened by running the truck a but more. But I can't help wondering if the heat exchanger valve issue is a design problem that causes something to seize up from lack of use rather than over use and heat cycle extremes. Some of my trips are so short there's lots of throttle from lights and stop signs and minimal to no time to go between ICE and electric mode.

Knowing This I've made it a point to get it to cycle back and fourth more the last few days. I am leaning towards thinking maybe there is a critical part moving that valve that is does not work well if it doesn't get enough exercise.

 

[jmh686]

My truck was at the shop for almost three weeks. Service department determined it’s a bad actuator. They ordered a replacement part ML3Z*5A212*W. Unfortunately the part is on backorder with no projected ETA. I was able to pick up on truck last week and can continue to use it until the part arrives.

@Jdela010 how long did you drive with the original valve? Mine just started doing this, but I’m supposed to drive out of state this weekend.

 

[Jdela010]

@Jdela010 how long did you drive with the original valve? Mine just started doing this, but I’m supposed to drive out of state this weekend.

A few months. You should be fine for your trip.

 

[JasonATL]

You’re a rockstar @Jedala010! My truck was back at the dealer for the past week working on this issue and they weren’t making any progress. When I shared the information you posted they confirmed that this is indeed the issue. Now we just need to wait for the part to get off back order and arrive. At least I can drive it in the interim.

Probably the first time ever of a dealer service dept taking ”something I saw on the internet” seriously.

Thanks again!

So glad I found this thread. Dealer had mine for a week for this issue and no fix. Told me ones on the lot they have do the same thing and due to the temperature and not an issue. Said Ford told them they can't mess with anything related to the battery and the noise is normal. ? Problem is this noise didn't exist for the first 2 years of owning the truck. Going to reschedule now with this information and hopefully they will actually fix it this time as the squeak seems to be getting louder.

Does anyone know if the actuator can fully fail and what issue that would cause if it happened?

 

[eharri3]

Mine finally threw a code so the dealer could not ignore it. They replaced my heat exchanger a couple weeks ago and no noise since then. It chirped for months before the code with no other drivability issues. Then the code went away as soon as I turned the truck off but was stored.

when I took it in it was for both the noise and the code. They read the code as heat exchanger but told me could not duplicate the noise. I did not know they were related but put 2 and 2 together once they told me it was the heat exchanger.

From what I understand the chirp
Can go on for awhile and maybe it can fully fail but it's a gradual process. Something in there starts to slowly seize up over time like it's not properly lubricated or somewhere in the mechanism 2 materials that aren't compatible rubbing against each other wear away at eachother over time.

I would persist as the most consistent explanation I hear is heat exchanger. You don't want to get screwed out of your warranty freebie because they wear prematurely on a bunch of trucks so that's mistaken for it being normal.

Keep at them. A truck that doesn't make a noise for 2 years and then has one pop up has a problem.

Hopefully we can eventually get a tsb generated so the dealers know where to start and don't default to "sounds normal" and then make you prove otherwise.

So glad I found this thread. Dealer had mine for a week for this issue and no fix. Told me ones on the lot they have do the same thing and due to the temperature and not an issue. Said Ford told them they can't mess with anything related to the battery and the noise is normal. ? Problem is this noise didn't exist for the first 2 years of owning the truck. Going to reschedule now with this information and hopefully they will actually fix it this time as the squeak seems to be getting louder.

Does anyone know if the actuator can fully fail and what issue that would cause if it happened?

 

[Vallee]

Mine finally threw a code so the dealer could not ignore it. They replaced my heat exchanger a couple weeks ago and no noise since then. It chirped for months before the code with no other drivability issues. Then the code went away as soon as I turned the truck off but was stored.

when I took it in it was for both the noise and the code. They read the code as heat exchanger but told me could not duplicate the noise. I did not know they were related but put 2 and 2 together once they told me it was the heat exchanger.

From what I understand the chirp
Can go on for awhile and maybe it can fully fail but it's a gradual process. Something in there starts to slowly seize up over time like it's not properly lubricated or somewhere in the mechanism 2 materials that aren't compatible rubbing against each other wear away at eachother over time.

I would persist as the most consistent explanation I hear is heat exchanger. You don't want to get screwed out of your warranty freebie because they wear prematurely on a bunch of trucks so that's mistaken for it being normal.

Keep at them. A truck that doesn't make a noise for 2 years and then has one pop up has a problem.

Hopefully we can eventually get a tsb generated so the dealers know where to start and don't default to "sounds normal" and then make you prove otherwise.

Do you have a part number for the heat exchanger?

 

[JasonATL]

Does anyone know if a TSB has been created for this issue? I haven’t taken mine back but it’s gotten much worse and doing it all the time now. Was just thinking about taking it back in again to the dealer.

 

[Wangeltmg]

Was the heat exchanger covered by warranty? My dealership is saying that it is not. It will cost me 1k out of pocket to replace it.

 

[ryanc111]

Was the heat exchanger covered by warranty? My dealership is saying that it is not. It will cost me 1k out of pocket to replace it.

It was covered by warranty when I had the work done replacing the heat exchanger.

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