Engine-Codes - Mercury - B1178 MERCURY

B1178 MERCURY - Right Power Running Board Deploy And/Or Stow Circuit Short To Battery

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

B1178 MERCURY Possible Causes

  • Faulty Power Running Board Motor Assembly
  • Power Running Board Motor Assembly harness is open or shorted
  • Power Running Board Motor Assembly circuit poor electrical connection
  • Faulty Power Running Board (PRB) Module

How is the B1178 MERCURY 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.

What is the cost to diagnose the B1178 MERCURY code

Labor: 1.0

The cost to diagnose the B1178 MERCURY 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)

B1178 MERCURY Meaning

During Power Running Board (PRB) deployment, the PRB module supplies power to the PRB motor and ground through the circuit. The PRB module stows the PRB by supplying power to the PRB motor and ground through the circuit. The PRB module provides a regulated 10-volt power supply to the Hall-effect sensor (internal to the PRB motor) through the circuit. The Hall-effect ground is provided by the PRB module through the circuit. The PRB module monitors the PRB Hall-effect signal through the circuit. If the PRB module does not receive any signal from the Hall-effect sensor during operation, the PRB will stop. The PRB module sets this Diagnostic Trouble Code (DTC) if a short to battery voltage is detected in the RH running board motor circuit(s).

More Information

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