C350e malfunction battery

Jul 20, 2020 | 02:02 PM

Stephon290689

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Joined: Jul 2020

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c350e hybrid

C350e malfunction battery

Hey in my country we barely have any hybrid specialist mechanics. it is also very costly
any and all help will be much appreciated.

Jul 20, 2020 | 06:21 PM

RA032924

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Joined: Jul 2007

Posts: 84

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From: Djibouti

I6 and V6 Diesels

I would check the UK forums...they seem to have a bigger C350E community there. I found this forum link which may be helpful to you...
https://forums.mercedesclub.org.uk/i...-c350e.172603/

Would love to hear what you discover...I 'still' love my C350e but sadly haven't driven much since COVID.
On a positive note, I have not used any gasoline since Covid started...all short trips on Electric only.

Jan 30, 2022 | 03:03 AM

Leonidasb

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Joined: Jan 2022

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C350e

Quote:

Originally Posted by Stephon290689

Hey in my country we barely have any hybrid specialist mechanics. it is also very costly
any and all help will be much appreciated.

hi, I have the same problem did you find out what was the problem? Thank you

May 11, 2022 | 03:28 PM

ijordan

Newbie

Joined: Aug 2021

Posts: 1

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C350e

The same problem! Cannot see any replies! Usually cannot shift to R or D, message disappears overnight! In the meantime the Car cannot start!

Aug 15, 2023 | 10:11 AM

MooseLinguist

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Joined: Aug 2023

Posts: 1

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C350e

Quote:

Originally Posted by ijordan

The same problem! Cannot see any replies! Usually cannot shift to R or D, message disappears overnight! In the meantime the Car cannot start!

For anyone else still interested or finding this later, this is almost certainly due to a low (probably failing) 12v battery. It throws up loads of electrical slips, faults (and fault codes), as you may know from conventional cars, and also seems to push the HV system into thinking it's losing voltage or having insulation problems (likely the cause of the Malfunction notification). This is also why it says it can't tow. Another common message asks you to drive to a dealership without changing gear (likely due to running gear actuators not getting enough juice). Other faults that may get coded to the OBD may concern cruise control, collision provention, ABS, oil pump actuators, the list is endless. Many of these are not faults per say but just flagging up as failing due to power loss. Suggest you change 12v battery, clear all codes and go from there.

Reason car won't start is likely that there's not enough juice in the 12v to depress brake pedal. Press a bit harder, past the switch which allows you to put in D, and you'll get it on. Or, better, charge up the hybrid battery and then try. If all else fails place a trickle charger on the 12v for a few hours and then try. Be wary of this, though, as AGM batteries need about 15v to charge and many ordinary chargers won't do it. I wouldn't advise messing too much with a dud battery either, since the HV, 12v, and aux battery (capacitor really) are very interlinked and you don't want to cause any more issues.

Dec 26, 2023 | 07:01 PM

Merc4321

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Joined: Dec 2023

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C350e

C350e hybrid problem

Quote:

Originally Posted by Stephon290689

Hey in my country we barely have any hybrid specialist mechanics. it is also very costly
any and all help will be much appreciated.

hi there. Did anyone ever find out what the problem is please?

I have a headache from this car. New 12v agm battery, new starter motor, new auxiliary battery. Please help!

Dec 26, 2023 | 07:02 PM

Merc4321

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Joined: Dec 2023

Posts: 2

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C350e

Quote:

Originally Posted by Leonidasb

hi, I have the same problem did you find out what was the problem? Thank you

hi there. Did you end up finding out what the problem was please?

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Feb 14, 2025 | 03:49 AM

eilifk

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Joined: Feb 2025

Posts: 1

Likes: 0

Problem with battery malfunction

[QUOTE=Merc4321;8898307]hi there. Did anyone ever find out what the problem is please?

I have a headache from this car. New 12v agm battery, new starter motor, new auxiliary battery. Please help!

Had battery malfunction, something with gear and towing forbidden for a month ago. Mercedes norway said it was ptc heater and isolation cable, something about the part of hybrid battery. After they fixed this for around 80000 NOK the fault is still. After they tok contact with mercedes in germany they needed to change the steering unit for 70000 NOK. And the Bill is up in 200000 nok for the moment. Have it insured. They say it will be ready after that but I dont know. I think i will keep it to diesel or benzin cars from now on.