Mercedes Benz B-Class Electric loss of power problems

Filed Jul 6, 2024 · Steering, Transmission · NC

MERCEDES DEALER NOTES : 07/19/2022 CLIENT STATES STEERING IS STIFF. STARTED ABOUT 1 TO 2 MONTHS AGO AND WOULD SHOW UP ONCE AND AWHILE. WHEN IT WOULD ACT UP WOULD NOT DRIVE IT AND IT WOULD LOCK THE STEERING . THIS HAPPENED MULTIPLE TIMES, WITH ACCIDENT HAZARD. WE DID THE BELOW WORK. ELECTRIC POWER STEERING RACK FAULTY REPLACE COMPLETE ELECTRIC POWER STEERING RACK. WHICH COST US OVER $3000. NOW WE HAVE SIMILIAR PROBLEM STEERING IS TIGHT AGAIN, MAKING FLAPPING NOISE, DEALER RECOMMENDED REPLACEMENT OF POWER STEERING RACK, GEAR BOX 07/02/24 , MERCEDES HAS RECALL ON MANY MODELS DURING YEAR 2015-2018 FOR electric power steering systems, Mercedes says the cars use electric power steering systems that May have soldered contacts that weren't soldered correctly inside the control units. The bad contacts can cause a sudden loss of power steering while driving, causing serious problems if driving around a curve or at slow speeds.

Filed Jul 17, 2019 · Engine · 30,000 miles · CA

The "malfunction" light appeared and vehicle lost power immediately. After coming to a complete stop, then switching the ignition off and back on again, the car operated normally and the "malfunction" light disappears. This occurred three times: during highway driving (55 MPH), on a country road (45 MPH), and at almost a stop (5 MPH). One occurrence was in the early evening on a hot day and two were early in the morning when temperatures were cool. Two of these failures were very dangerous circumstances and it is very lucky that no one was nearby on the road at that time. Since it is a fully electric car it loses momentum very quickly and I had to desperately look for a turnout at once. One time my two young children were in the back seat of the car. Mercedes benz dealership diagnosed the cause to be the drive unit at a cost of $9,000. They claim this is a different problem than the previous recall (which the car had completed). I have read through the previous recall information and it sounds very much like what this car is doing. I would like to request the federal safety agency investigate whether the previous recall actually fixed the problem. The car has 30,000 miles but mercedes benz refuses to fix the car because the warranty expired in december 2018 (seven months ago). They only offer a 4 year/50,000 mile warranty (whichever occurs first).

Filed Sep 15, 2016 · Engine, Fuel system · 43,276 miles · CA

Extremely dangerous sudden loss of power while driving 70+ MPH on busy highway. Was almost involved in a serious traffic collision because it a stopped in the road. Attempts to restart the vehicle failed. Could not get the vehicle out of "park" and was unable to switch it into "neutral" to roll the vehicle out of the lane of high speed traffic. The inability to get the vehicle into "neutral" further compromised my safety and the safety of other drivers on the highway. Main low voltage 12v battery died soon after incident and created an issue for tow truck operator. He had a lot of trouble getting it into neutral because there seems to be no standardized manual / mechanical method to release the parking prawl in the transmission unless the low voltage 12v system is fully functioning. Perhaps they need to replace the entire drivetrain unit like tesla has done or their customers. Electric powertrain unit used in the mercedes is identical to early tesla vehicles. Telsa redesigned and updated these powertrain units with free replacements that resolve this issue completely. Mercedes needs to do the same repair for customers as tesla did. Software update is obviously not a sufficient fix for this issue, there must be physical faults as well. Another issue is a mystery clunk that you can feel thru the accelerator pedal when starting from a complete stop. Several attempts to get service techs to fix this but they have been unable to fix it. Perhaps it is related to the well known early production tesla drivetrain defects. My vehicle currently has 43,276 miles. This vehicle already had the software update that was supposed to guarantee that the sudden loss of power would not happen again. (( the federal safety agency campaign number: 15v655000 )) I hope mercedes steps up to solve this issue like telsa has done for their customers.

Filed Apr 8, 2016 · Transmission · 3,000 miles · CA

Car stalled while going on expressway at 30 MPH. Complete loss of power. Had to pull over and power off the car. Restart of the car after a while and everything was back to normal.

Filed Oct 11, 2015 · Engine, Fuel system · 1,600 miles · CA

My b-class electric had a sudden loss of power. Here's the details: left the house in san diego at 7:00 am. Outside temperature about 75+degrees. About 1 mile from the start, I braked slightly to maintain speed of about 25 MPH, coasted towards and uphill, put my foot on the accelerator to maintain speed and there was no power-just coasting. There was no unusual sound and no warning displayed. The car appeared normal except the guage was showing full regenerative braking while the car was coasting. Transmission was in d-auto. Power steering worked, AC and radio were still on. I brought it to a stop. Pushed the button to turn it off. At that time all the lights on the dash lit up. I pushed it again and the car was back to normal with the indicator showing zero between regeneration and discharge. I finished the drive without further incident. Mileage: 1620 miles purchased: june 2015 mfg date: 4/15 took the car to the dealer two hours later and told them about the problem and that the forum says there is a code update available. Waited there for 3 hours. Their paper work says: 1639 541011, 540991, 540992. Programmed power train control unit. Performed short test; no relevant fault codes. Checked power train control unit for software updates. Update was available. Programmed and coded power train control unit. Complete.

Filed Oct 8, 2015 · Electrical, Engine · 3,300 miles · CA

On 10-5-15, my 2015 mercedes b class with 3300 miles decided to lose all power in the middle of 101 in rush hour traffic. Luckily traffic was moving at 15mph, I had to completely stop the car in the middle lane. Put the car in park, shut it off and restart to regain power. There were no check engine light or signs that the car was broken, I just simply lost all drive power even though I was in d. It was scary as I was on the 101 at about 4pm. This also happened at another when I first got the car, please get mercedes to fix this before I get rear-ended and crushed.

Filed Sep 24, 2015 · Acceleration · 2,390 miles · CA

Unexpected loss of power - we have experienced total loss of acceleration and throttle power resulting in the vehicle rolling/drifting to a stop. In order to regain throttle power, the car must be placed in park and the engine start button depressed. This loss of power has occurred to me at least 3 times at low speeds (10-25 MPH), once at 45 MPH and once at 65 MPH while driving in the far left lane of 73 south toll road, california. Also important is that at the time forward power is lost, the regeneration gauge on the far right of the dashboard moves immediately to maximum indication and all warning lights become illuminated. During the first dealer service on july 24, 2015 the dealer found code message u029887, u016883 and u029287 missing. Dealer performed a software update and updated ptcu drivetrain n127 module. The dealer has replaced the ptcu drivetrain n127 twice - once on service dated july 29, 2015 and again on service dated august 28, 2015. On service dated july 29, 2015 dealer replaced drivetrain gateway module n93/8. Found code c10c800 not related. On service dated august 28, 2015 dealer retrieved all data from ptcu drivetrain module n127. Owner has videotaped the loss of power occurring and provided it to dealer. Owner's children are frightened to drive in the vehicle. Teenage daughter was very frightened driving at 65 MPH when she experienced unexpected total loss of power and had to drift into the the left shoulder of a busy freeway and restart the car after coming to a stop. Mercedes and tesla - you have a lemon!

Filed Sep 21, 2015 · Fuel system, Transmission · 1,000 miles · CA

I was driving on the 91 freeway in anaheim ca when my brand new (approximately 1000 miles on the odometer) 2015 mb all electric automobile began to decelerate. My foot was on the accelerator as I lost all power to the engine. The battery was fully charged. The radio and all of the electronic interior features were intact. I was in the 3rd lane of traffic (out of 5). Luckily the traffic was light as I pulled over to the side of the freeway and the car came to a complete stop. I was quite unnerved by the incident but the car started up and I continued my commute to work uneventfully. I took my vehicle to the mercedes dealership and they evaluated the car. They could not replicate the event and could not find an anomaly in the on board computers. I presented testimony from this very website disclosing 7 other recent similar events in this model car. I advised the dealership that I was not taking possession of the auto unless something was done. They presented the information to mercedes benz/tesla technical support. The gateway powertrain control unit was replaced. I expressed my concern to the mb dealership that this maybe a systemic problem, given the number of complaints in such a short period of time. The dealership representative expressed sympathy with my situation but declared that this is something we should take up with daimler-benz. The dealership is a separate entity which only buys/sells and provides maintenance for mb automobiles. I expressed that this defect has me concerned every time I enter a freeway. The service manager could not reassure me that this will not happen again. I hope it does not take fatalities before there is a recall.

Filed Aug 31, 2015 · Acceleration, Fuel system · 1,626 miles · CA

I was driving at 55 MPH on the freeway with both hands on the wheel when all of a sudden I lost power to the accelerator pedal. No mechanical problem was indicated on the dash: the car was 'ready' and was in 'd' yet I had no power whatsoever to the accelerator pedal. I could not pull over to get out of trouble because I was surrounded by fast moving traffic and had no power. I could not brake to try to restart the car without being rear ended by the considerable traffic behind me on the freeway. My only option was to continue to coast from my initial speed with the hazard lights on even though I was at high risk of being struck by another driver. Once stopped in the fast lane of the freeway, it took 2 or 3 attempts at switching the power on and off before the car was able to move again. The failure symptoms appear similar to the rav4 EV that has the same power components supplied by tesla, and since march/april 2015 is the subject of a recall notice for this power loss issue. We purchased this new vehicle from an authorized mercedes dealer on june 30, 2015, there was no disclosure of this issue. The mercedes electric vehicle failure put me and my passenger in a potentially fatal situation.

Filed Aug 24, 2015 · Acceleration, Fuel system · 2,380 miles · CA

Sudden loss of power while driving on a highway at 65-70mph. No indication of any problem on dash board, except an indication that it was at maximum regeneration. Gear selection indicator displayed that the car was in drive, not in neutral. No response from throttle pedal pressing. Slowly drifted across multiple lanes of highway until I reached the shoulder and came to a stop. Turned car off and then back on, after which the car behaved normally again.