AutoCodes – Mercury – U0151 Mercury

U0151 Mercury Code - Lost Communication with Restraints Control Module

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Restraints Control Module (RCM), Restraints Control Module harness is open or shorted, Restraints Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0151 Mercury indicates Lost Communication with Restraints Control Module.
Common causes: Common causes include Faulty Restraints Control Module (RCM), Restraints Control Module harness is open or shorted, Restraints Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 624

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 27, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0151 Mercury Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Restraints Control Module (RCM) has not been received.

OBDII Code U0151 Mercury - Lost Communication with Restraints Control Module - AutoCodes.com — U0151 Mercury Code - Lost Communication with Restraints Control Module

What does this mean?

What are the Possible Causes of the DTC U0151 Mercury?

Faulty Restraints Control Module (RCM)
Restraints Control Module harness is open or shorted
Restraints Control Module circuit poor electrical connection

How to Fix the DTC U0151 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0151 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0151 Mercury Code

1. What does the OBDII code U0151 mean on a Mercury vehicle?

U0151 indicates that the vehicle's computer has lost communication with the Restraints Control Module (RCM), which manages systems like airbags and seatbelt pretensioners.

2. What are the common symptoms of the U0151 code in a Mercury?

Symptoms may include the airbag warning light being illuminated, non-functional airbags or seatbelt systems, and other warning lights on the dashboard.

3. What causes the U0151 code to appear on a Mercury?

Common causes include a faulty Restraints Control Module, damaged wiring or connectors, a blown fuse, or issues with the Controller Area Network (CAN) bus.

4. Is it safe to drive a Mercury with the U0151 code active?

Driving may be possible, but it is not safe, as the airbag and seatbelt systems may not function correctly in the event of a collision.

5. How can I diagnose the U0151 code on my Mercury?

Start by checking the wiring and connectors to the Restraints Control Module for damage or corrosion, inspect the fuses, and use a scan tool to monitor CAN bus communication.

6. Can a dead battery cause the U0151 code in a Mercury?

Yes, a dead or weak battery can disrupt communication between modules and trigger the U0151 code.

7. How do I fix the U0151 code on a Mercury?

Repairs may include replacing or repairing damaged wiring, cleaning or reconnecting corroded connectors, replacing a blown fuse, or replacing the Restraints Control Module if it's faulty.

8. What tools are needed to troubleshoot the U0151 code?

A multimeter, a CAN bus-compatible scan tool, and basic hand tools are typically needed to diagnose and repair this code.

9. Can a software issue cause the U0151 code in a Mercury?

Yes, outdated or corrupted software in the vehicleâ€™s modules can sometimes cause communication issues like the U0151 code.

10. How much does it cost to repair the U0151 code on a Mercury?

Repair costs vary; wiring repairs might cost $100-$200, while replacing the Restraints Control Module could cost $300-$800, depending on labor and parts.