EQC Malfunctioned During Operation

[MrGreedy]

Has anyone else experienced the EQC400 unexpectedly shutting down while in operation?


I operate a Mercedes EQC400, and recently the vehicle abruptly lost power when I was travelling at approximately 100 km/h. Upon its cessation:


The brakes became exceedingly cumbersome.
The steering became exceedingly challenging.
The car functioned as though a conventional petrol vehicle had stalled—it merely coasted till it collided.
I am currently seeking to ascertain if others have encountered a similar experience. I observe numerous online remarks indicating that individuals have heard of similar occurrences, although I am finding it challenging to locate authentic first-hand reports.

If you have experienced this issue or know someone who has, I would greatly appreciate information on its resolution—specifically, whether Mercedes diagnosed the problem, whether the vehicle was repaired, and whether any measures can be implemented to prevent recurrence.

Thank you; any information would be greatly appreciated.

[CyberNinja]

One would assume that functional brakes following any engine failure (whether electric or internal combustion) would be a legal mandate, alongside steering capabilities. I assume that you were unable to brake or steer upon impact, which contradicts your assertion that the brakes and steering were merely heavy. Merely inquisitive!

[MrGreedy]

To reiterate my previous argument, Mercedes did not address the issue about the reduction of brake and steering assistance. I enquired if they had evaluated the vehicle under same circumstances (i.e., an abrupt power failure), and naturally, they were unable to do so, therefore they only instructed me to return the automobile. I remain without an explanation and possess a vehicle that experienced a significant malfunction, which they have been unable to replicate or diagnose. I am seeking individuals who have encountered similar experiences, since it now appears to be a safety concern that has been overlooked.

[AMG33D]

You stated in the previous thread that after the incident, MB retained the vehicle for three months before returning it to you, claiming they changed the HV battery under warranty but declined to disclose particular details about the original defect (they also replaced two buckled wheels).


Regrettably, this is prevalent in warranty repairs; automobile manufacturers typically do not furnish any information or evidence. On a few times, I managed to obtain a photocopy of their internal report from the dealer (Vauxhall), but they are normally disinclined to comply with such requests.

However, you have had the vehicle serviced under warranty. What is the current issue? Have you lost confidence in the vehicle? Is it related to money, and can it not be eliminated without suffering a loss? Et cetera.

[AMG33D]

A driver may be caught off guard if the assisted brakes and power steering abruptly become heavy while navigating a corner at high speed.

[MrGreedy]

Indeed, that is precisely what transpired. Mercedes retained the vehicle for around three months, substituted the high-voltage battery under warranty, and returned it to me without providing any clarification regarding the underlying failure. They replaced two buckled wheels when I indicated that a road test had evidently not been conducted.

I acknowledge that manufacturers frequently do not disclose internal reports; nonetheless, in this instance, the absence of information is especially concerning due to the vehicle's complete power failure, resulting in an immediate loss of both braking and steering assistance. Upon requesting clarification or simply fundamental confirmation of their beliefs regarding the events, I received no response.



Considering the gravity of the breakdown and its resultant crash, it is challenging to regard "no comment" as an adequate answer. I am want to ascertain if others have encountered a similar incident, as the lack of transparency from Mercedes renders it impossible to determine whether this was an isolated defect or a broader safety concern.

[MrGreedy]

For the interest of clarification, I would want to clarify that the car was travelling at 40 mph, not 100 kph. I am uncertain how that discrepancy appeared in my first post. Thank you.

[MrGreedy]

😁