Engine-Codes - Gmc - B051A GMC

B051A GMC Code - Left Side Assist Step Motor Control Circuit

Repair Importance Level: 1/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

|B051A GMC code possible causes

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

|How is the B051A 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.

|B051A GMC code tech notes

B051A 0B Left Side Assist Step Motor Control Circuit Current Above Threshold
B051A 01 Left Side Assist Step Motor Control Circuit Short to Battery
B051A 02 Left Side Assist Step Motor Control Circuit Short to Ground
B051A 04 Left Side Assist Step Motor Control Circuit Open Circuit

|What is the cost to diagnose the B051A GMC code

Labor: 1.0

The cost to diagnose the B051A 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.

|What are B051A GMC code possible symptoms?

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

|What is B051A GMC code 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.

|Need more information with the B051A GMC code?

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