It will not start or crank the Mercedes C63S W205. Dash lights up... battery charged!

[CyberNinja]

Hi there, everyone. Excuse me, but I was hoping someone could lend me a hand.
The other night, I was commuting for two hours in my 2017 Mercedes C63S while the weather was absolutely horrible. As soon as I over a couple small puddles and entered the highway, a red battery warning light came on and the power went off. I park on the side of the road and turn off the engine. Once again, the car wouldn't crank or start. I charged the battery after arriving back home, but it still hasn't worked. It appears to be operational in every other way, but it simply refuses to crank. On the dashboard, I am seeing a few of warnings... Electronic rear axle differential lock is not functioning, traction control is not working, etc.


I ran a quick scan and received a few codes...
There is an issue with communication with the "combustion engine" control unit (U010031). We are unable to receive the signal.
U010029 There is an issue with communication with the "combustion engine" control unit. Something is wrong with the signal.

Is anyone else familiar with this?
We would really appreciate any assistance you can provide.

[jimmy47785]

Appears to have severed communications with the engine ECU.

Assuming you didn't hydrolock the engine after plunging through floodwaters....

[CyberNinja]

Much obliged for the response.
There was clearly not enough water to cover the intake area... I'm almost certain it isn't hydrolocked.


Underneath these vehicles, you could find the ECU, which might be damaged by water or some wiring.

[CyberNinja]

This man has the same problem, but he hasn't explained how he fixed it.

[jimmy47785]

If I were to guess, I'd say you should talk to a Xentry representative about it.