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B1138 Nissan Code - Diagnosis Sensor Unit

Quick Answer

The B1138 Nissan code refers to an issue with the Diagnosis Sensor Unit in the vehicle. Common causes include Wiring issues or electrical connections, Faulty Diagnosis Sensor Unit, Software glitches or programming errors. 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
B1138 Nissan indicates Diagnosis Sensor Unit.
Common causes
Common causes include Wiring issues or electrical connections, Faulty Diagnosis Sensor Unit, Software glitches or programming errors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B1138 Nissan Description

The B1138 Nissan code refers to an issue with the Diagnosis Sensor Unit in the vehicle. The Diagnosis Sensor Unit is a crucial component that is responsible for monitoring various systems within the vehicle and detecting any malfunctions or abnormalities. When this code is triggered, it indicates that there is a problem with the sensor unit, which can have significant implications for the vehicle's performance and overall functionality.

OBDII Code B1138 Nissan - Diagnosis Sensor Unit
B1138 Nissan Code - Diagnosis Sensor Unit

Common Causes of B1138 Nissan

  1. Wiring issues or electrical connections.
  2. Faulty Diagnosis Sensor Unit.
  3. Software glitches or programming errors.
  4. Environmental factors such as extreme temperatures or moisture.
  5. Impact or damage to the sensor unit.

Symptoms of B1138 Nissan

  1. Check Engine Light is illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Engine misfires or rough idling.
  4. Transmission shifting issues.
  5. Loss of power or acceleration.

How to Fix B1138 Nissan

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific fault codes, including the B1138 Nissan code.
  2. Inspect the wiring and electrical connections related to the Diagnosis Sensor Unit for any signs of damage or corrosion.
  3. Test the sensor unit itself to determine if it is functioning correctly or needs to be replaced.
  4. Check for any software updates or reprogramming that may be required to address the issue.
  5. Clear the fault codes and perform a test drive to ensure that the problem has been resolved.

Cost to Fix B1138 Nissan

The typical repair costs for addressing the B1138 Nissan code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for a Diagnosis Sensor Unit replacement can range from $200 to $500, while the labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may fall between $300 and $700.

Need more information about the B1138 Nissan code?

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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.

Frequently Asked Questions about B1138 Nissan Code

1. What does OBDII code B1138 for Nissan indicate?

The B1138 code specifically refers to a fault in the Diagnosis Sensor Unit in Nissan vehicles.

2. What are the common symptoms of a B1138 OBDII code in a Nissan car?

Common symptoms include the airbag warning light staying on, the horn not working, and potential issues with the vehicle's safety systems.

3. What are the possible causes of the B1138 OBDII code in a Nissan vehicle?

The B1138 code can be triggered by a faulty Diagnosis Sensor Unit, damaged wiring, or poor connections in the airbag system.

4. How can I diagnose the B1138 code in my Nissan car?

Diagnosis typically involves using a diagnostic scanner to retrieve the specific error code and then inspecting the Diagnosis Sensor Unit and related components for any visible damage.

5. Is it safe to drive with a B1138 OBDII code in my Nissan car?

It is not recommended to drive with an active B1138 code as it can affect the proper functioning of the airbag system, compromising safety in the event of an accident.

6. Can I repair the B1138 code in my Nissan vehicle myself?

While some basic troubleshooting like checking for loose connections can be done by DIY enthusiasts, diagnosing and repairing the Diagnosis Sensor Unit may require professional help.

7. What are some tips for repairing the B1138 OBDII code in a Nissan car?

Ensure all connections are secure, inspect wiring for damage, and consider seeking assistance from a qualified mechanic to accurately diagnose and fix the issue.

8. How much does it typically cost to repair the B1138 code in a Nissan vehicle?

The cost of repairs can vary depending on the exact cause of the issue, but it's advisable to budget for diagnostic fees and potential replacement parts if needed.

9. Can resetting the OBDII system clear the B1138 code in my Nissan car?

Resetting the system may temporarily clear the code, but if the underlying issue with the Diagnosis Sensor Unit persists, the code is likely to reappear.

10. Is it necessary to replace the Diagnosis Sensor Unit when dealing with the B1138 OBDII code in a Nissan vehicle?

If the Diagnosis Sensor Unit is confirmed to be faulty, replacement may be necessary to resolve the B1138 code and ensure the proper functioning of the airbag system.

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