2024 Hybrid strange groaning noise from engine compartment

[vandeda2024]

The groaning/lurching is a separate issue from normal brake creaking. The groaning/lurching in OP's video happens in my vehicle even when the brake is pressed very hard, when the truck is in neutral, and when auto-hold is applied.

Got it ... I'll admit I saw the latest post and replied to that ... my mistake

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[bjorno]

Got it ... I'll admit I saw the latest post and replied to that ... my mistake

No problem! This issue is near and dear to my heart so just want to make sure there's clear info out there.

 

[e01569]

So a bit of an update, I've been using auto hold since I last posted and I still get the noise, no change there

I am not getting any movement, lurching, or vibrations in the brake pedal or anywhere else, just the noise. I wonder if I am dealing with something different or the same issue but don't have it as bad as others who are experiencing the lurching.

 

[bjorno]

So a bit of an update, I've been using auto hold since I last posted and I still get the noise, no change there

I am not getting any movement, lurching, or vibrations in the brake pedal or anywhere else, just the noise. I wonder if I am dealing with something different or the same issue but don't have it as bad as others who are experiencing the lurching.

It's interesting because I'm hearing the same noise as you, but I also getting the lurching. Other owners experience just the lurching with no noises. Most owners in the poll don't experience either seems like. I'm going back and forth with Ford corporate to try for a fix so we will see.

 

[e01569]

It's interesting because I'm hearing the same noise as you, but I also getting the lurching. Other owners experience just the lurching with no noises. Most owners in the poll don't experience either seems like. I'm going back and forth with Ford corporate to try for a fix so we will see.

Thanks Jon, hopefully we can get some answers one of these days.

 

[HeyBales]

So a bit of an update, I've been using auto hold since I last posted and I still get the noise, no change there

I am not getting any movement, lurching, or vibrations in the brake pedal or anywhere else, just the noise. I wonder if I am dealing with something different or the same issue but don't have it as bad as others who are experiencing the lurching.

I'm thinking app Remote Start doesn't work if doors or hood are open, so perhaps best to get phone video ready to go, open hood, start truck, press gas if needed to get ICE on, and record where you seem to hear the sound coming from.

Since you aren't getting the shimmy others feel.

And having the transmission fluid level checked for full.
I recall some posts that at 1st oil change they discovered it low.
Made me check mine when I did oil after breakin.

 

[yoyomav]

Just to add another datapoint:

23 hybrid maverick.

Originally i was getting lurching but no grinding noise

But just took the car for a few recalls, and they updated the PCM software. Now I'm getting more of a vibration from the brake petal accompanied by grinding noise. This seems to indicate that the software has a role here. The only way to stop the symptom seems to be shifting the truck to neutral / park.

 

[HeyBales]

Just to add another datapoint:

23 hybrid maverick.

Originally i was getting lurching but no grinding noise

But just took the car for a few recalls, and they updated the PCM software. Now I'm getting more of a vibration from the brake petal accompanied by grinding noise. This seems to indicate that the software has a role here. The only way to stop the symptom seems to be shifting the truck to neutral / park.

Oh for sure. (ETA - correct in post below)

When the ICE is running and you are stopped - it has to perfectly match the Generator Motor RPM in a ratio to that ICE RPM.
That prevents torque from actually reaching the wheels. Until you lift up on the brake - then traction motor torque applied.
Well, you can watch the ICE RPM pretty much hold steady to 1250 - but not exactly. Bouncing from 1240 to 1260, and the GM RPM is being changed too.

I'm sure it's fun dance for the computer to control the air flow to ICE to control RPM, as temps and air density are changing from driving to sitting, and making the GM RPM adjust quick enough.

Neutral removes some of the resistance in the GM that would produce electricity for sending back to the HVB. So part of the dance is easier.
I still get vibrations in N when cold. Not as loud though.
P & D both are doing regen - and I get it then too.

 

[saladbar]

Adding my 2023 Hybrid to the pile too. Started happening after my CV axles were warrantied due to failure at about 23,000 miles. Both grinding noise and peddle vibration. I noticed the problem on the way home from the dealership post CV replacement and drove with it for a few weeks hoping it would go away.

Truck has been at my dealership for 2 weeks now as they work with engineering. Last update I was told they're thinking it's a dampener issue which doesn't sound like a fun replacement at all.

 

[wax87]

Adding my 2023 Hybrid to the pile too. Started happening after my CV axles were warrantied due to failure at about 23,000 miles. Both grinding noise and peddle vibration. I noticed the problem on the way home from the dealership post CV replacement and drove with it for a few weeks hoping it would go away.

Truck has been at my dealership for 2 weeks now as they work with engineering. Last update I was told they're thinking it's a dampener issue which doesn't sound like a fun replacement at all.

Are the boots tearing and therefor letting the grease sling out of the joint?

 

[saladbar]

Are the boots tearing and therefor letting the grease sling out of the joint?

I heard that was the cause, but I didn't notice axle grease everywhere before taking mine in. Just a nice clunk noise/feel.

Very weird to me that there are so many reports of the (potential) dampener failure after the axle replacement.

 

[HeyBales]

I heard that was the cause, but I didn't notice axle grease everywhere before taking mine in. Just a nice clunk noise/feel.

Very weird to me that there are so many reports of the (potential) dampener failure after the axle replacement.

There have been soooo many more reports without that connection, replacement and no issues.
And many reports of the vibration that had no CV axle swaps.
Coincidence.

If you watch the Weber videos on the tranny, you'll see the lack of connection there between those two.

 

[Mavster Mechanic]

Oh for sure.

When the ICE is running and you are stopped - it has to perfectly match the Generator Motor RPM in a ratio to that ICE RPM.
That prevents torque from actually reaching the wheels. Until you lift up on the brake - then traction motor torque applied.
Well, you can watch the ICE RPM pretty much hold steady to 1250 - but not exactly. Bouncing from 1240 to 1260, and the GM RPM is being changed too.

I'm sure it's fun dance for the computer to control the air flow to ICE to control RPM, as temps and air density are changing from driving to sitting, and making the GM RPM adjust quick enough.

Hey HeyBales.

Sometimes it sounds like you don't fully understand this eCVT. This is a case.

When at a full stop, the generator and engine are mechanically connected. Two (or more) gears are in mesh. They are Siamese twins. Joined at the hip.

There is no "dance".
There is no computer matching speeds.
The speeds are physically connected.
The generator has "no matching to do quick". It's instantaneous and fixed. Never wavering a fraction of an RPM.

The gasoline engine can drive the generator.

The generator can drive the engine.

The generator can "freewheel".
The engine can "freewheel".

But the speed ratio between the two is fixed. It is never, ever, adjusted when wheels are stationary.

 

[HeyBales]

Hey HeyBales.

Sometimes it sounds like you don't fully understand this eCVT. This is a case.

When at a full stop, the generator and engine are mechanically connected. Two (or more) gears are in mesh. They are Siamese twins. Joined at the hip.

There is no "dance".
There is no computer matching speeds.
The speeds are physically connected.
The generator has "no matching to do quick". It's instantaneous and fixed. Never wavering a fraction of an RPM.

The gasoline engine can drive the generator.

The generator can drive the engine.

The generator can "freewheel".
The engine can "freewheel".

But the speed ratio between the two is fixed. It is never, ever, adjusted when wheels are stationary.

Huh, must just be the log file PID readings are off then or when viewing there is a slight difference in read times.

So I've been mentally taking the no ICE running scenario while moving and translated that to when the ICE is spun up or spinning while stationary.
So not a possible reason for the shakes, that's a bummer.

 

[Mavster Mechanic]

Huh, must just be the log file PID readings are off then or when viewing there is a slight difference in read times.

So I've been mentally taking the no ICE running scenario while moving and translated that to when the ICE is spun up or spinning while stationary.
So not a possible reason for the shakes, that's a bummer.

Definitely lag times in the OBDII data.

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