Engine-Codes - Gmc - B051C GMC

B051C GMC - Left Side Assist Step Position Sensor Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B051C GMC Possible Causes

  • Faulty Left Side Assist Step Position Sensor
  • Left Side Assist Step Position Sensor harness is open or shorted
  • Left Side Assist Step Position Sensor circuit poor electrical connection
  • Faulty Assist Step Control Module (ASC)

How is the B051C GMC code repair?

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.

Tech Notes

B051C 62 Left Side Assist Step Position Sensor Circuit Actuator Stuck Open
B051C 63 Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed
B051C 02 Left Side Assist Step Position Sensor Circuit Short to Ground
B051C 29 Left Side Assist Step Position Sensor Circuit Too Few Pulses
B051C 01 Left Side Assist Step Position Sensor Circuit Short to Battery
B051C 2A Left Side Assist Step Position Sensor Circuit Too Many Pulses
B051C 22 Left Side Assist Step Position Sensor Circuit Low Time < Minimum

What is the cost to diagnose the B051C GMC code

Labor: 1.0

The cost to diagnose the B051C GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B051C GMC Meaning

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.

More Information

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