CLS400 Auto Start/Stop
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Senior Member
Joined: Jul 2019
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CLS400 4Matic EC Tuned
CLS400 Auto Start/Stop
The feature works when the A/C is not on. The feature also sometimes doesn’t work, let’s say I stop at a red light, sometimes it shuts off, sometimes I have to hold the brake for about 4 seconds and then it shuts off. Sometimes it the A/C is on 1-2 fan speed, it shuts off, but 90% of the time if the A/C is running, it never ever shuts off. Is my auto start stop functioning correctly, or does the auxiliary battery need to be replaced? I was with some family and their GLS550 has the A button with a circle for auto start/stop, and they had the A/C on full blast every time, and the SUV turned off at EVERY stop.
Also, sometimes it doesn’t even shut off at red lights, and the a/c isn’t on. The car’s temperature is also how it is when you’ve been driving it for a while, and the outside temperature is 20-30 degrees Celsius.
Also, sometimes it doesn’t even shut off at red lights, and the a/c isn’t on. The car’s temperature is also how it is when you’ve been driving it for a while, and the outside temperature is 20-30 degrees Celsius.
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Joined: Sep 2019
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2016 CLS400
The start stop will turn off if it determines it doesn't need the engine running to keep the cabin cool, doesn't matter the fan speed ect. I use the auto setting and in Florida if the system will turn off if the cabin is cool but start many times before I leave from a stop as the sun has made it to hot to keep cool without the ac compressor and engine running.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Thread Starter
Senior Member
Joined: Jul 2019
Posts: 443
Likes: 91
CLS400 4Matic EC Tuned
The start stop will turn off if it determines it doesn't need the engine running to keep the cabin cool, doesn't matter the fan speed ect. I use the auto setting and in Florida if the system will turn off if the cabin is cool but start many times before I leave from a stop as the sun has made it to hot to keep cool without the ac compressor and engine running.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Thread Starter
Senior Member
Joined: Jul 2019
Posts: 443
Likes: 91
CLS400 4Matic EC Tuned
The start stop will turn off if it determines it doesn't need the engine running to keep the cabin cool, doesn't matter the fan speed ect. I use the auto setting and in Florida if the system will turn off if the cabin is cool but start many times before I leave from a stop as the sun has made it to hot to keep cool without the ac compressor and engine running.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Also you have to have the pedal depressed a certain amount or it will not shut off or push down into "hold" for the brake. Also regardless of if the AC is on if the system may also stay on for airmatic (if equipped) or if you have the car in sport. Eco/Start Stop is functioning just like it should from what you described. THe GLS550 you described actually sounds like it has an issue if the auto system shut off all the time. Also keep in mind if they dont have the AC on and the fan at full blast it will still shut off.
Newbie
Joined: Oct 2019
Posts: 5
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From: Seattle, WA
2016 Mercedes CLS400 Base 3.0 Twin turbo
I visited the dealer few months ago because of Stop & Go functions did not work any more while it is under warranty(2 months to 3 year coverage). Mechanic checked while I was out and called to come back. They did not do anything and said I need to re-charge the battery or replace it since I am using my dash-cam all the time and it drained the battery. Because of that they cannot cover and replace the battery by the warranty. I disconnected the dash and drive around for while, Stop & Go started working for couple days but now it has been completely stopped. No matter how hot or cold, AC on or Off, it is not working anymore. Dealer suggested to change the battery and stop using un-authorized dash cam! I will let you know after I replace to new battery.
Thread Starter
Senior Member
Joined: Jul 2019
Posts: 443
Likes: 91
CLS400 4Matic EC Tuned
I visited the dealer few months ago because of Stop & Go functions did not work any more while it is under warranty(2 months to 3 year coverage). Mechanic checked while I was out and called to come back. They did not do anything and said I need to re-charge the battery or replace it since I am using my dash-cam all the time and it drained the battery. Because of that they cannot cover and replace the battery by the warranty. I disconnected the dash and drive around for while, Stop & Go started working for couple days but now it has been completely stopped. No matter how hot or cold, AC on or Off, it is not working anymore. Dealer suggested to change the battery and stop using un-authorized dash cam! I will let you know after I replace to new battery.
Super Member
Joined: Mar 2012
Posts: 619
Likes: 34
From: East part of Texas
2017 CLS550
I have solved every conceivable problem noted above and other problems known and yet to be discovered with the Stop/Start system, and it is quite an easy fix too. I get in the car, turn it on and disable the Start/Stop button immediately before putting the car in gear. All total it takes 0.8 second. No more air conditioning wear, no more starter stress, no more battery replacements and power issues, no more jerking, no more wondering if it is actually working properly or is broken - no more nothing. Never a problem and it works every single time. Of course this means I don't have Stop/Start feature which to me is a good thing because I don't want it and I don't need it. On a big v8 twin turbo it does not save gas, at least not for me. This feature might help with emission control in big city traffic where pollution is compounded by huge numbers of emissions but it is negligible here in the deep, rural country where I live. It is the one thing on my CLS that should it ever break it will not be fixed.
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Thread Starter
Senior Member
Joined: Jul 2019
Posts: 443
Likes: 91
CLS400 4Matic EC Tuned
I have solved every conceivable problem noted above and other problems known and yet to be discovered with the Stop/Start system, and it is quite an easy fix too. I get in the car, turn it on and disable the Start/Stop button immediately before putting the car in gear. All total it takes 0.8 second. No more air conditioning wear, no more starter stress, no more battery replacements and power issues, no more jerking, no more wondering if it is actually working properly or is broken - no more nothing. Never a problem and it works every single time. Of course this means I don't have Stop/Start feature which to me is a good thing because I don't want it and I don't need it. On a big v8 twin turbo it does not save gas, at least not for me. This feature might help with emission control in big city traffic where pollution is compounded by huge numbers of emissions but it is negligible here in the deep, rural country where I live. It is the one thing on my CLS that should it ever break it will not be fixed.
Super Member
Joined: Mar 2012
Posts: 619
Likes: 34
From: East part of Texas
2017 CLS550
Newbie
Joined: Oct 2019
Posts: 5
Likes: 0
From: Seattle, WA
2016 Mercedes CLS400 Base 3.0 Twin turbo
Dashcam need separate battery
As Shortspark mentioned in the thread, I am not a bigger fan of Stop/Start function anyway but only getting rid of the feeling that some function of my Mercedes does not work!
So, If you really want to hardwire the dashcam, I strongly suggest installing small, rechargeable & designated battery for dashcam. Mine was two channel that can record front and rear, which will even drain more power from battery.
Member
Joined: Sep 2017
Posts: 113
Likes: 29
cls550 2014
If your heat or cool settings are not being achieved the system will not turn engine off. With defrost on it should not stop engine. System requires a very strong battery to work. If you set your thermostat to 60 degrees it won't work.
