Mercedes W205 2016 Does Not Accelerate Properly

[abubakarameer55]

W205 276 engine. Error code P250513 (The power supply at the input of the control unit "combustion engine" has an electrical fault). Please provide any support from your side.

 

[Tom PPP]

Error code P250513 may indicate the following:

- a problem with the Airflow Sensor
- a problem with the Transmission Control Unit (TCU/FDCT)

Without further research, no further recommendations can be made.
I suspect the problem is in the air flow sensor.

 

[ucmb]

Could you please provide more details about the problem? At what engine speed does it begin to occur? Does the RPM fluctuate? Does the problem occur at low, medium, and full RPMs?

As noted above, the error code is sometimes insufficient to determine the root cause.

 

[Peter5]

Have you measured the voltage of the main and auxiliary batteries directly at the terminals (engine not running, but ignition on)?
It looks like the engine control unit has detected a voltage problem.