Powertrain Issue? + Graby Brakes?

[killowatt]

Became a huge Maverick fan this past year. Ive bought two identical 2024 XL hybrids.

The first one has had little to know issued but the second one has the following occur:

Issue #1:
When at a full stop (red light, stop sign) and white my foot is on the brake, the car feels like its fighting to move forward.

I have to presd very very firmly on the brake to prevent forward movement with the car. Its very subtle but myself and parter can feel it while driving.

Issue #2
Additionally, its only happened once but a similar issue has occured where I put the vehicle in reverse, shifted to drive and got a message saying "transmission is not in park".

Love these trucks and want them to last. Any ideas on why this randomly happend?

Sponsored

 

[MarkLally]

I don't know the cause, but I have problem #1 on rare occasion, for me it's not a steady push, but instead it pulses. 2023 XLT

 

[Scupking]

I have a 22 and can sometimes feel the pulses when at a light. Seems to be a common thing. Doesn’t bother me.

 

[Ozarkbeard]

I've never had either issue, but have had random messages appear on the screen before I had time to notice/read them.

The notices are probably errors to do with the CAN bus.

 

[The Real Maverick]

Became a huge Maverick fan this past year. Ive bought two identical 2024 XL hybrids.

The first one has had little to know issued but the second one has the following occur:

Issue #1:
When at a full stop (red light, stop sign) and white my foot is on the brake, the car feels like its fighting to move forward.

I have to presd very very firmly on the brake to prevent forward movement with the car. Its very subtle but myself and parter can feel it while driving.

Issue #2
Additionally, its only happened once but a similar issue has occured where I put the vehicle in reverse, shifted to drive and got a message saying "transmission is not in park".

Love these trucks and want them to last. Any ideas on why this randomly happend?

#1 is fairly common and often reported. It is not desirable, but is "normal" for this type of transmission.

You will probably find this effect is most pronounced on a cold or only slightly warmed engine, usually during the first 2-4 minutes of your drive, and while the HV battery is low and is being recharged by the generator.

You have three gear-sets always in mesh.

1) Engine
2) Generator
3) Traction motor which is full time attached to the front wheels

There is no mechanical disconnect of any of these at any time. In fact, there is no mechanical "neutral" either. Only electronically simulated "neutral".

At your stoplight / stopsign:

The engine is generating torque to turn the generator to recharge the HV battery pack. This can be as much as 40 horsepower while standing still.

In the 3-way power split transmission, for all 40 HP to be sent to the generator, yes, by necessity, the wheels (and attached traction motor) need to be firmly held. It makes sense.

If you take your foot off the brake but do not press the accelerator, some of the 40 horsepower is going to "leak" to the wheels, and you will move forward.

I hope I explained this well. If not, let me know and I'll try to clarify WHAT is going on.

I'm not sure why it is worse on a cold engine, but my guess is, it is programmed to use more gas, and work harder to accelerate warm up. Therefore, with 40 HP you'll naturally feel some power "leaking" (my term) to the wheels.

Once warmed up, the engine is either off at stops, or not working half as hard, thus, the "leakage" to the wheels is not noticed.

In short, do you agree you "feel" this only during the first few minutes? The reason it is "random" is sometimes your battery is low and sometimes it isn't.

 

[The Real Maverick]

Here's another example:

You can turn the key off while the truck is rolling down a hill.

Doing this, the gas engine stops.
The traction motor continues to spin in what we'll call the "forward" direction (traction motor direction of spin is tied to wheel direction of spin ).
The generator MUST spin in an equal rpm in the "backwards" direction.

So now the generator is turning backwards, assuming the truck is moving forwards.

You can restart the engine while "coasting" forward. But there is no real neutral and now the generator is being spun backwards.... but the engine cannot be spun backwards. So what the heck happens?

Power is sent to the generator in reverse polarity to stop it or grossly slow it down. This then transfers torque from the wheels based on the trucks forward momentum to the engine in the proper direction. By computer, you are in effect, push starting the truck, and you'll often feel the negative G-force as starting the engine, in some conditions, will abruptly slow the truck down.

Sponsored