After jump starting having problems

[grober]

There are possibly 4+? discrete components involved in the 722.6 transmission control signaling the gearchange module [ PRND+/-] , the TCU, that round connection plug and the so called conductor plate inside the gearbox- might be a fault in any of them. The transmission sub- system talks to the engine to give and receive information- if its faulty it will tell the engine management system to go into limp home mode to protect the transmission. That's why you need more precise information. The modern Mercedes Star system is quite expensive so you are unlikely to find it outside a dealer or mercedes specialist workshop and of course is only as good as the technician using it. Its usually a word of mouth recommendation thing.

 

[ice643]

Thanks for all the replies your help is much appreciated, i took the car today to another electrician.
He had a snap on machine, he checked everything and in the end sorted the car , he has told me it is the battery.
The car drives fine now hopefully it should be ok.
Thanks again.

 

[grober]

Markjay got it right.

 

[nickjonesn4]

Jump starting from another car is indeed not recommended, because the higher voltage generated by the other car's alternator could damage electronic components (and vice versa - in fact both cars are at risk).

The correct way of dealing with a flat battery is to jump-start it from another 12V car battery (i.e. not connected to a vehicle), or by trickle-charging it.

Said that, it is impossible to say if the issues you describe are the result of damage to electronic components during the jump starting, or other unrelated faults. A good place to start would be to get the car on MB STAR diagnostic computer and check for faults.

One other thing to consider, is that electronic components on modern cars don't work very well when the battery is weak or faulty.

I would try trickle-charging the battery (using CTEK charger or similar) until it's fully charged, then check again how to car behaves. Failing that, I would fit a new battery (or at least a known-good battery) and see how the car behaves before condemning any malfunctioning electrical components.

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