Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
B051D 62 Right Side Assist Step Position Sensor Circuit Actuator Stuck Open
B051D 63 Right Side Assist Step Position Sensor Circuit Actuator Stuck Closed
B051D 29 Right Side Assist Step Position Sensor Circuit Too Few Pulses
B051D 2A Right Side Assist Step Position Sensor Circuit Too Many Pulses
B051D 22 Right Side Assist Step Position Sensor Circuit Low Time < Minimum
The cost to diagnose the B051D GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The Assist Step Control Module (ASC) controls the running board actuators to extend or retract the running boards. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The ASC control module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the voltage on the position signal circuit changes. The ASC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.
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