Fault code P 155F

This OBD fault code is applicable to BMW fault code: P 155F. Throttle Actuator 2- limp home mode begins. Throttle Actuator 2- limp home mode begins. Category: powertrain system (from the manufacturer's own meaning). Detailed meaning: In the electronic throttle control (ETC) system, the throttle actuator is a stepping motor, which is responsible for controlling the throttle opening according to the instruction of the throttle control module. The limping home mode means that if ECU finds the fault of ETC system, it will command the signal to turn off the motor to the throttle position. At this time, a set of springs in the throttle will adjust the throttle to a fast idle state to ensure that the engine will not stall, but not too fast.