E300 Hybrid System not engaging

Fentoozler90

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80 miles into the drive not cutting over to electric at all again but when I come to a stop like in the photo there’s a shudder in the footwell but I’ve been at a standstill for 5 minutes and it’s just sat chewing diesel
 

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RDS

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E Class, Nov 2014, E300 Hybrid
That's good but I wonder why it appears inconsistent, although I hope it stay like that for you.
 

Fentoozler90

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That's good but I wonder why it appears inconsistent, although I hope it stay like that for you.
It’s supposed to be going in for a diesel software update tomorrow but not sure that’s a good idea
 

RDS

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Sorry, I had not seen you response with a picture when I posted my last comment.
If your Diesel software update is being done by a Main Dealer (I always use Main Dealer) then maybe they can explain why you are seeing so much inconsistency.
The only time mine does not turn the engine off if I am stopped, is if the Hybrid charge is showing less than about 35%.
 

Fentoozler90

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Sorry, I had not seen you response with a picture when I posted my last comment.
If your Diesel software update is being done by a Main Dealer (I always use Main Dealer) then maybe they can explain why you are seeing so much inconsistency.
The only time mine does not turn the engine off if I am stopped, is if the Hybrid charge is showing less than about 35%.
Sorry, I had not seen you response with a picture when I posted my last comment.
If your Diesel software update is being done by a Main Dealer (I always use Main Dealer) then maybe they can explain why you are seeing so much inconsistency.
The only time mine does not turn the engine off if I am stopped, is if the Hybrid charge is showing less than about 35%.
the diesel software from what I’ve read detunes the car to reduce NoX And increases adblue usage similar the the Vw emmisions problems a few years ago so I’m not overly sure I should be taking it in for that doing at all - I’m going to get it booked into a Mercedes specialist to see if they can help replcing the AGM battery has definitely made a difference but still not right it seems
 

RDS

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E Class, Nov 2014, E300 Hybrid
It just seems strange that it is so inconsistent. I was pleased for you when I read your message timed at 6:03 this morning, only for it all to change a couple of hours later.
 

Fentoozler90

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It just seems strange that it is so inconsistent. I was pleased for you when I read your message timed at 6:03 this morning, only for it all to change a couple of hours later.
It’s worked fantastic all weekend this morning back to its old ways haha
 

RDS

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E Class, Nov 2014, E300 Hybrid
That's great for the weekend but why has it changed today.
Have you got an intermittent wiring problem?
 

kotecki

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2021 213 E300e estate 216Cdi Sprinter (stretched limo)
Yes. It will set off and drive up to 10mph before the engine starts.
Also if I am driving along at any speed and the momentum is keeping the car going, the engine will turn off and then use the hybrid system to keep going. With careful use of the accelerator and keeping an eye on the charge/discharge dial it will run on electric at any speed. It is only when setting off that it is limited to 10mph.
You make an interesting comment, is this 10mph speed what other members experience? I ask this as we have a 2021 petrol hybrid and the petrol engine most definitely does NOT cut in at that speed or anywhere near it. Most of our journeys are around town but my wife does express her frustration with a beep noise that comes from the car whenever the vehicle exceeds the speed limit.. I wonder who set that option??:D:D I only mention this as the petrol engines does not kick in, even at 30mph, plus there is a slight gradient outside our property and the boss does not hang about when pulling up that hill but it is still just electric horses that pull our trusty steed. So far we are averaging 141.2mpg (UK) and the fuel tank indicates being 91% full. The car was filled up when it was delivered and has so far never revisited a fuel selling em porium ;)
 

Fentoozler90

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That's great for the weekend but why has it changed today.
Have you got an intermittent wiring problem?
No drain on the battery it’s in with a specialist in a few weeks so I’ll wait for them to let me know what the issue is but yes it’s very intermittent seems to not like coastal routes haha
 

Fentoozler90

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Hi,

Yes, I picked up the car from service a week ago.

Now the battery works perfect!

No more errors, all sections has a similar voltage. More over I saw a 99% of charge!

Whole process took 10 days.
The disassemble process is really very hard. But the weld looks as from factory.

View attachment 69084
I replaced the 12v battery and I had a good 4 days of it driving like a hybrid but come Monday morning it’s severely hit and miss maybe gone onto electric twice while coasting in 400 miles and sitting on dieeel at lights etc
 

Fentoozler90

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C300h
FDBA13E5-E222-49BA-BB93-D5E4C2A350C2.jpeg I replaced the 12v battery and I had a good 4 days of it driving like a hybrid but come Monday morning it’s severely hit and miss maybe gone onto electric twice while coasting in 400 miles and sitting on dieeel at lights etc this is the battery I put in recommended by euro car parts and I’m guessing there internal system told them it’s suitablecan anyone confirm wether it’s upto it?
 

kotecki

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2021 213 E300e estate 216Cdi Sprinter (stretched limo)
As an active member with a hybrid, I would like to help andsee what battery we have in the back of our car but sadly, the mind is willing but my body is unable... I have just got back from a visit to our local hospital.

If it is easy to take the cover off, I might try tomorrow or more likely ask the wife but I would need to know how to explain to the boss how to get access Boot1.jpg
 

RDS

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E Class, Nov 2014, E300 Hybrid
It's obviously up to you but I would not remove the cover from the Hybrid Battery on a Brand New Car.
One thing I can say and it explains why you can drive it on Electric for longer distances, is that your battery box is about 20 times as big as the one on my Nov 2014 E 300. It is tiny and in the corner under the bonnet (rear left corner when looking from the front of the car)
 

kotecki

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2021 213 E300e estate 216Cdi Sprinter (stretched limo)
You speak wise words, I just feel guilty, but I wonder if we might have solved the problem? It would also be a waste of time if the author's battery is a similar size to yours.
 

RDS

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E Class, Nov 2014, E300 Hybrid
We haven't solved the problem because one day his car behaves the same as mine, the next day it is completely different.
Incidentally, is your car plug-in as well?
 

Fentoozler90

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We haven't solved the problem because one day his car behaves the same as mine, the next day it is completely different.
Incidentally, is your car plug-in as well?
Koteckis I think will be a 350e plug in petrol hybrid - which makes sense they changed to plugins after only a few years of mild hybrids given the trouble people seem to have with the mild hybrids - mine is inconsistent and it’s baffling me typical electrical issue never consistent new battery is sitting at 12.7 volts after a night off there’s no drain on the battery my next step prior to it going into a specialist Friday is check the aux battery as that has to hold up for the millisecond between the 12v main battery and the 130v he battery
 

RDS

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E Class, Nov 2014, E300 Hybrid
@Fentoozler90, Just a minor point. Our cars are not known as Mild Hybrid. That is a term usually used for Hybrid vehicles that cannot drive any distance at all on Electric. The only items the Hybrid Battery will power in Mild Hybrid vehicles are ancillary ones, like lights.
 

kotecki

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2021 213 E300e estate 216Cdi Sprinter (stretched limo)
Koteckis I think will be a 350e plug in petrol hybrid - which makes sense they changed to plugins after only a few years of mild hybrids given the trouble people seem to have with the mild hybrids - mine is inconsistent and it’s baffling me typical electrical issue never consistent new battery is sitting at 12.7 volts after a night off there’s no drain on the battery my next step prior to it going into a specialist Friday is check the aux battery as that has to hold up for the millisecond between the 12v main battery and the 130v he battery
Mine is the latest hybrid and the E-class range of hybrid is: Saloon: E300e petrol, E300De diesel. In the UK you can only have an estate with the diesel option.

I understand what you are saying RDS and I grant I may well be clutching at straws but when there is a gallon of fuel or less in the tank, do the onboard computers allow for the mild hybrid taking some of the workload from the engine and then when the mild hybrid is not performing... The computers adjust? With just enough fuel left for 48 miles, how accurate is that reading? I am just thinking is it worth the time and money to start looking in depth at this issue. My mild hybrid suggestion can easily be dismissed but what else can it be if it does not regulary come up with a fault\issue\problem?

I am learning about our version of the hybrid and from what I gather, range prediction for our version is done by software\computer?? whatever and it adapts to driving style, plus expected terrain. 'Expected' might be the wrong terminology but I understood what was explained to me. My 141.2mpg is not a prediction, it is simply what the car has achieved as opposed to what it should achieve.

I knew the way our vehicle would be used and the majority of journies it would make. The E-class hybrid we have is perfect for our very specific requirements. At present it is still averaging 141.2 mpg, but overtime I expect this to improve. The level of petrol has remained static for weeks at 91% full and the car has just travelled 14 miles under petrol power :)
 

RDS

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E Class, Nov 2014, E300 Hybrid
The Hybrid system in my E300, behaves exactly the same, whether the Diesel fuel is full or on Reserve.
Mild Hybrid is the wrong term, as I explained above.
I may be wrong but I do not think that Mercedes have produce a 'Mild' Hybrid.
 


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