AutoCodes – Generic – U0179

U0179 Code - Lost Communication With Restraints System Sensor 'J'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Restraints System Sensor 'J', Restraints System Sensor 'J' harness is open or shorted, Restraints System Sensor 'J' 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: U0179 indicates Lost Communication With Restraints System Sensor 'J'.
Common causes: Common causes include Faulty Restraints System Sensor 'J', Restraints System Sensor 'J' harness is open or shorted, Restraints System Sensor 'J' 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 1,770

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 Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0179 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating 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 System Sensor 'J' has not been received.

OBDII Code U0179 - Lost Communication With Restraints System Sensor 'J' - AutoCodes.com — U0179 Code - Lost Communication With Restraints System Sensor 'J'

What does this mean?

What are the Possible Causes of the DTC U0179?

Faulty Restraints System Sensor 'J'
Restraints System Sensor 'J' harness is open or shorted
Restraints System Sensor 'J' circuit poor electrical connection

How to Fix the DTC U0179?

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 U0179 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.

Need more information about the U0179 code?

Need more information on how to fix the U0179 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0179 code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 U0179 Code

1. What are the common symptoms of OBDII code U0179?

The common symptoms of OBDII code U0179 include the airbag warning light illuminating on the dashboard, loss of communication with the restraint system sensor 'J', and potential issues with the airbag system.

2. What can cause the OBDII code U0179 to appear?

The OBDII code U0179, indicating lost communication with the restraint system sensor 'J', can be caused by damaged wiring, faulty connectors, a malfunctioning sensor, or issues with the onboard diagnostic system.

3. How serious is the OBDII code U0179?

The OBDII code U0179 should be addressed promptly as it relates to the communication with an essential safety system in the vehicle, the restraint system sensor 'J'. Ignoring this code could potentially compromise the functionality of the airbag system.

4. Can I still drive my vehicle with the OBDII code U0179 present?

It is not recommended to drive the vehicle with the OBDII code U0179 present, as it indicates a communication issue with the restraint system sensor 'J', which is a critical component of the airbag system. It is best to address this issue before continuing to drive the vehicle.

5. How can I diagnose and repair the OBDII code U0179?

Diagnosing and repairing the OBDII code U0179 may involve checking the wiring and connectors related to the restraint system sensor 'J', testing the sensor for proper functionality, and using a diagnostic tool to reset the code after addressing the underlying issue.

6. Are there any DIY repair tips for the OBDII code U0179?

While some basic diagnostic steps can be taken, addressing the OBDII code U0179 may require advanced tools and expertise. It is recommended to consult a professional mechanic to accurately diagnose and repair the issue.

7. Is the OBDII code U0179 a common issue in certain vehicle makes and models?

The OBDII code U0179 can occur in various vehicle makes and models, particularly those equipped with advanced airbag systems and onboard diagnostic capabilities. However, the frequency of this code may vary depending on the vehicle's design and components.

8. Can resetting the OBDII code U0179 resolve the issue temporarily?

Resetting the OBDII code U0179 may temporarily clear the warning light, but if the underlying issue with the communication to the restraint system sensor 'J' is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

9. How much does it typically cost to fix the OBDII code U0179?

The cost of fixing the OBDII code U0179 can vary depending on the underlying issue, the vehicle make and model, and the labor rates of the repair shop. It is advisable to obtain a diagnostic and repair quote from a trusted mechanic before proceeding with the repairs.

10. Can the OBDII code U0179 be related to other codes or issues in the vehicle?

The OBDII code U0179, indicating lost communication with the restraint system sensor 'J', is typically a standalone issue related to the airbag system. However, it is important to address any other related codes or warning lights that may appear simultaneously to ensure the overall safety and functionality of the vehicle.