Failure in the ESP sensor

Good afternoon, I have a fault with a Renault Megane LL, after working for a while it runs out of power and a Failure code number DF 012.
If someone can help me I thank you.

When you do a query, determine what motor you have since the failures in case of being a diesel are due to causes of gasoline.
Do you have a 1.5 dci (k9k)?
The code you mean accuses "problem of battery tension" (generally low) Some sensors need to be fed by adequate tension, otherwise they send erratic signals to the ECU and it enters emergency causing loss of power.