B051B - Right Side Assist Step Motor Control Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

B051B Possible Causes

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

First diagnose B051B code

    Check 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 terminals.

B051B Tech Notes

B051B 0B Right Side Assist Step Motor Control Circuit Current Above Threshold
B051B 01 Right Side Assist Step Motor Control Circuit Short to Battery
B051B 02 Right Side Assist Step Motor Control Circuit Short to Ground
B051B 04 Right Side Assist Step Motor Control Circuit Open Circuit

Cost of diagnosing the B051B code

    Labor: 1.0

    The cost of diagnosing the B051B 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.

B051B Possible Symptoms

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

B051B 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.
OBDII Code B051B - Right Side Assist Step Motor Control Circuit - Engine-Codes.com

B051B More Information

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