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Engine-Codes - Buick - B051A BUICK

B051A BUICK - Left Side Assist Step Motor Control Circuit

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

B051A BUICK Possible Causes

What does this mean?
  • 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 BUICK 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

What does this mean?
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 BUICK code

Labor: 1.0

The cost to diagnose the B051A BUICK 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.
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Possible Symptoms

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

B051A BUICK 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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