AutoCodes – Nissan – B142B Nissan

B142B Nissan Code - Ignition Voltage

Quick Answer

The Airbag Diagnosis Sensor Unit, also known as the Airbag Control Module or Electronic Crash Unit, is a computer that controls the airbag system. Common causes include Faulty Airbag Diagnosis Sensor Unit, Airbag Diagnosis Sensor Unit harness is open or shorted, Airbag Diagnosis Sensor Unit 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: B142B Nissan indicates Ignition Voltage.
Common causes: Common causes include Faulty Airbag Diagnosis Sensor Unit, Airbag Diagnosis Sensor Unit harness is open or shorted, Airbag Diagnosis Sensor Unit 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 49

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 Nov 10, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B142B Nissan Description

The Airbag Diagnosis Sensor Unit, also known as the Airbag Control Module or Electronic Crash Unit, is a computer that controls the airbag system. It receives data from collision sensors, and if a severe impact is detected, it signals the airbags to deploy. This unit also stores crash data and can communicate with other vehicle systems, like the engine control unit. Ignition voltage is supplied to the Airbag Diagnosis Sensor Unit when the ignition is in the ON position. The air bag diagnosis sensor unit will monitor for low or high ignition voltage.

OBDII Code B142B Nissan - Ignition Voltage - AutoCodes.com — B142B Nissan Code - Ignition Voltage

What does this mean?

What are the Possible Causes of the DTC B142B Nissan?

Faulty Airbag Diagnosis Sensor Unit
Airbag Diagnosis Sensor Unit harness is open or shorted
Airbag Diagnosis Sensor Unit circuit poor electrical connection

How to Fix the DTC B142B Nissan?

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 B142B Nissan 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 B142B Nissan code?

Need more information on how to fix the B142B Nissan code? Get Access to Factory Service Manuals

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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.