A method of operating a drivetrain of a motor vehicle. The drivetrain comprising a drive aggregate with at least one electric machine. During operation of the drivetrain according to the method, when an accelerator pedal and a brake pedal are not actuated, the drivetrain is operated in a speed-regulated crawling mode and during this mode a nominal speed value is compared with an actual speed value and, on the basis of the difference between these speed values, a crawling torque is produced as a control output. During a purely electrical speed-regulated crawling operation, if a positive crawling torque is produced as the control output, then the torque produced by the electric machine is regulated such that the actual speed value is approximately equal to the nominal speed value and, during such operation, an electrical energy accumulator of the drivetrain is discharged more intensively since the electric machine is operated as a motor.