[RM5]

So it happened twice car was in Park ! (gear) selected after few minutes car rolls back on inclined road . luckily was in car . took it to dealer and was told it states it in the owners manual car can default back to neutral So on a hill must use parking brake. what engineering marvel was this

 

[Zeus]

It actually switches back into neutral? That is one of the most dangerous things that I have ever heard of. Generally you should use the parking brake anyway, but that should be just in case, not because the car could switch into neutral at any moment.

Weird.

 

[BenzFan]

thats not good at all for this to happen with an automatic transmission.
time to develop a new habit to keep using the parking brake.

 

[Tonyride]

I've never experienced this problem before. I usually always engage the parking brake anyway but there were a few times that I forgot the the car did roll a bit , like maybe an inch or two, and stopped.

 

[RM5]

On a slight incline you should not need to use the parking brake. plus the fact that it goes into neutral on its own apparently Mercedes knows this because they have a disclaimer in the manual.

 

[Tonyride]

On a slight incline you should not need to use the parking brake. plus the fact that it goes into neutral on its own apparently Mercedes knows this because they have a disclaimer in the manual.

Can you point out what page that's on in the manual?

 

[RM5]

Can you point out what page that's on in the manual?

page 142

 

[Tonyride]

Check out pages 154 and 155 of the owner's manual. Are you sure you put the car in P and not N before you shut the car off and remove the Smart Key?

 

[Tonyride]

page 142

According to the warning on that page it sounds like you put the car in Neutral (N) instead of Park (P ) when you shut off your car. Are you sure put push the button at the tip of the shift lever to put it in Park rather than moving the lever up or down to put it in Neutral? Because it says if you put it in park the brake is automatically engaged.

 

[StayCLAssy]

Idle neural is a bit more common nowadays with manufacturers trying to make fuel efficient cars. Either the CLA is equipped with this feature or the torque in the small engine isn't enough to hold the car. Either way you should never rely on the transmission alone to hold a car on an incline.

Tony, with your comment on it rolling back then stopping makes me wonder if it is also equipped with anti rollback. Was it decent size incline and can you feel the brake disengage when pressing the accelerator?

Unfortunately, all articles are still focused on reviewing the car instead of the technical details to find out.

 

[Tonyride]

Idle neural is a bit more common nowadays with manufacturers trying to make fuel efficient cars. Either the CLA is equipped with this feature or the torque in the small engine isn't enough to hold the car. Either way you should never rely on the transmission alone to hold a car on an incline.

Tony, with your comment on it rolling back then stopping makes me wonder if it is also equipped with anti rollback. Was it decent size incline and can you feel the brake disengage when pressing the accelerator?

Unfortunately, all articles are still focused on reviewing the car instead of the technical details to find out.

The incline is very slight but enough to make the car move but only a little bit. The car does have anti-roll back feature.

 

[RM5]

According to the warning on that page it sounds like you put the car in Neutral (N) instead of Park (P ) when you shut off your car. Are you sure put push the button at the tip of the shift lever to put it in Park rather than moving the lever up or down to put it in Neutral? Because it says if you put it in park the brake is automatically engaged.

Car was in park , NOT neutral .sitting in car when it rolled after 15 min or so.yet it shows P.
dealer pointed this out on page 142 and it says car can go into neutral hence use park brake .

 

[StayCLAssy]

*please delete this comment

 

[Tonyride]

Car was in park , NOT neutral .sitting in car when it rolled after 15 min or so. it states:- dealer pointed this out on page 142 and it says car can go into neutral hence use park brake .

You mean for 15 minutes the car held its position and then it just started to roll?

 

[StayCLAssy]

The incline is very slight but enough to make the car move but only a little bit. The car does have anti-roll back feature.

Thanks for clarifying.

 

[RM5]

you mean for 15 minutes the car held its position and then it just started to roll?

yes

 

[Tonyride]

yes

wow. That's insane.

 

[StayCLAssy]

Somethings not right, I would take to the dealer and have them show you others that roll back even in P mode. I take it this is what you're reading,

I can see how it can be taken as it will switch to N when turned off but I don't think it's the case. At least not when it's already on P mode. The part about the P-Brake is disclaimer found in all manuals for safety reasons. Kinda like always make sure to wear goggles when using power tools.

 

[RM5]

Somethings not right, I would take to the dealer and have them show you others that roll back even in P mode. I take it this is what you're reading,
View attachment 1482

I can see how it can be taken as it will switch to N when turned off but I don't think it's the case. At least not when it's already on P mode. The part about the P-Brake is disclaimer found in all manuals for safety reasons. Kinda like always make sure to wear goggles when using power tools.

I also think it is a defect but do I want to waste my time with the hard headed dealer.or just apply parking brake. I already took the car in twice both times could not duplicate. The explanation I was given is this is like a "hybrid transmission it is like a manual but an automatic you Have to use the P brake" . I must have had an idiot sticky note on my forehead.after waiting 3 hours I was done.

 

[StayCLAssy]

That it's the easy way out but I would rather have it fixed if it's an issue. If you're able to duplicate, pick up a service manager and take him to your house or where you're able to duplicate.
I've taken a manager on a ride along when his techs couldn't hear a noise I heard on the same turn I took every day to work. Came back from the drive and they installed new shocks.

You can always try a different dealer as well. But don't put a bandaid on it if it's an issue. You may someday forget to engage the p brake and could hurt someone.