tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

READ THIS before you buy or lease the MB B EV

Mon Jul 06, 2015 10:27 am

MB B EV and Toyota RAV4 EV share the same Tesla drivetrain (motor, firmware and battery technology)

Mercedes started selling the MB B EV in the U.S. July 2014.

Toyota sold the RAV4 EV from 2012 to 2014, there are approximately 2,500 of them on the road today.

Toyota is doing a recall because of Tesla's drivetrain issues (hardware or software I am not sure).

Here is Toyota's recall press release dated 3/11/2015:

http://pressroom.toyota.com/releases/to ... arch11.htm

Here is Toyota's defect information report dated 3/11/2015:

http://www-odi.nhtsa.dot.gov/acms/cs/ja ... 3-3968.pdf

In it they describe the problem: "The Electric Vehicle Traction Motor Assembly in the subject vehicles is part of the propulsion system, which contains a drive inverter (DI), DI electronic control unit (ECU), electric motor, motor speed sensor, shift control actuator, and transaxle assembly. The motor speed sensor detects the electric motor speed and rotational position, and sends this information as a signal to the DI ECU. Due to a software issue, the DI ECU may not be able to determine the rotational position of the motor, which causes a speed sensor error code. This will trigger a “Check EV System” warning message on the instrument panel, turn on a malfunction indicator lamp (MIL), and cause the electric motor to shift to “neutral”, resulting in a complete loss of drive power. A complete loss of drive power may increase the risk of a crash."

And on page 2 and 3, where the supplier is Tesla, they said: "November 2014 - February 2015. Additional reports were received, and the supplier continued to investigate the cause of the loss of drive power. During further investigation, the supplier determined that hardware variance is larger than firmware (software) tolerance. This can cause the drive inverter to be unable to determine the rotational position of the motor. If this occurs, a “Check EV System” warning message on the instrument panel will be triggered, a malfunction indicator lamp (MIL) will come on, and the electric motor will shift to “neutral”, resulting in a complete loss of drive power. "

Follow these links to keep up with MB B EV's sudden-loss-of-drive story:

1) List of MB B EV owners who experienced sudden loss-of-drive: viewtopic.php?f=8&t=380

2) MB B EV loss-of-drive: viewtopic.php?f=8&t=359

3) MB B EV drivetrain replacement: viewtopic.php?f=8&t=374

4) RAV4 EV recall status: http://www.myrav4ev.com/forum/viewtopic.php?f=7&t=1558
Last edited by tom on Wed Jul 22, 2015 8:19 am, edited 5 times in total.

GlennD
Posts: 502
Joined: Mon Jul 21, 2014 5:26 pm

Re: READ THIS before you buy or lease the MB B EV

Mon Jul 06, 2015 11:07 am

tom wrote:MB B EV and Toyota RAV EV share the same Tesla drivetrain (hardware and firmware)

There are 2,500 RAV EVs on the road.

Toyota is doing a recall (It's because of Tesla's drivetrain issues. Hardware or software I am not sure).

Here is Toyota's press release dated 3/11/2015:

http://pressroom.toyota.com/releases/to ... arch11.htm

Follow these two links to keep up with this story:

1) RAV EV recall: http://www.myrav4ev.com/forum/viewtopic.php?f=7&t=1558

2) MB B EV: viewtopic.php?f=8&t=359
For sure some cars have a problem. On the RAV4 EV forum most people report no problems.

A fix is always a good thing but so far my B has been fine.
2014 Cirrus White B Class (Totaled).
2016 Urano Gray eGolf.
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250e.
Blind Spot Assist, Performance 3 and Sahara Beige interie
WHITE IONIQ EV.

tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

Re: READ THIS before you buy or lease the MB B EV

Mon Jul 13, 2015 7:08 am

(deleted, duplicate info)

TonyWilliams
Posts: 236
Joined: Sat May 03, 2014 12:16 pm

Re: READ THIS before you buy or lease the MB B EV

Wed Jul 15, 2015 11:27 am

To help facilitate a future recall for the Tesla powered Mercedes Benz B-Class ED, make a report here if your car experienced going into neutral and loss of propulsion power while driving:

https://www-odi.nhtsa.dot.gov/VehicleCo ... ndex.xhtml

You can also phone the Vehicle Safety Hotline: 1-888-327-4236 / Hearing Impaired (TTY): 1-800-424-9153) for assistance. Form Approved: OMB No. 2127-0008; Expires 05/31/2018

You might mention in the report that this appears to be the same issue shared with the Tesla drivetrain in the 2012-2014 Toyota RAV4 EV "loss of speed sensor signal causes vehicle to go into neutral and lose propulsion power".

TonyWilliams
Posts: 236
Joined: Sat May 03, 2014 12:16 pm

Re: READ THIS before you buy or lease the MB B EV

Wed Jul 15, 2015 2:07 pm

Summary of the problem of the tolerances on the speed sensor being greater than the software is happy with:

http://www-odi.nhtsa.dot.gov/acms/cs/ja ... 3-3968.pdf

tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

Re: READ THIS before you buy or lease the MB B EV

Tue Aug 04, 2015 7:15 am

Added pharmama to sudden loss-of-drive LIST today.

pharmama post: viewtopic.php?f=8&t=359&p=3048#p3048

LIST: viewtopic.php?f=8&t=380

tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

Re: READ THIS before you buy or lease the MB B EV

Sat Aug 22, 2015 6:09 pm

Added forum member NYM to sudden loss-of-drive list today.

NYM's reported incident: viewtopic.php?f=8&t=359&p=3228#p3228

LIST: viewtopic.php?f=8&t=380

tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

Re: READ THIS before you buy or lease the MB B EV

Fri Aug 28, 2015 4:37 pm

Added forum member Jeff to sudden loss-of-drive list today.

Jeff's reported incident is here: viewtopic.php?f=8&t=359&p=3276#p3276

List is here: viewtopic.php?f=8&t=380

tom
Posts: 110
Joined: Sun Jun 21, 2015 9:08 am
Location: SF bay area

Re: READ THIS before you buy or lease the MB B EV

Sat Sep 19, 2015 4:46 pm

Added forum member CM23 to sudden loss-of-drive list today.

CM23's reported incident is here: viewtopic.php?f=8&t=359&p=3372#p3372

List is here: viewtopic.php?f=8&t=380

Comanchepilot
Posts: 39
Joined: Sun Apr 19, 2015 3:56 pm

Re: READ THIS before you buy or lease the MB B EV

Thu Feb 11, 2016 11:26 am

MB issued the software recalls for this - Tesla apparently simply made the tolerances wider - the kludge factor is strong with this car.

My wife loves the car, loves never having to buy gas, loves the feel and style of the car. It's been reliable for us - we're closing in on the 10,000 mile first inspections - which I will do my self and reset the service indicator.

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