B1138 Code - Diagnosis Sensor Unit
Quick Answer
The Air Bag Diagnosis Sensor Unit detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air bag warning lamp in the combination meter. Common causes include Faulty Diagnosis Sensor Unit, Diagnosis Sensor Unit harness is open or shorted, 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
- B1138 indicates Diagnosis Sensor Unit.
- Common causes
- Common causes include Faulty Diagnosis Sensor Unit, Diagnosis Sensor Unit harness is open or shorted, 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.
Code B1138 Description
The Air Bag Diagnosis Sensor Unit contains the “G†sensors for both frontal and side collisions and spare battery function in case of main battery damaged in a collision.
What are the Possible Causes of the DTC B1138?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1138?
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 B1138 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 B1138 code?
Need more information on how to fix the B1138 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1138 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B1138 Infiniti — Diagnosis Sensor Unit
- B1138 Nissan — Diagnosis Sensor Unit
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.
Frequently Asked Questions about B1138 Code
1. What does OBDII code B1138 mean?
The B1138 code refers to a fault in the Diagnosis Sensor Unit in the vehicle's system.
2. What are common symptoms of OBDII code B1138?
Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the airbag system.
3. What causes OBDII code B1138 to trigger?
The B1138 code can be triggered by a malfunction in the Diagnosis Sensor Unit, wiring issues, or a faulty airbag system component.
4. How serious is OBDII code B1138?
Code B1138 is a serious issue as it pertains to the airbag system, which is crucial for occupant safety in the event of a collision.
5. How can I diagnose OBDII code B1138?
Diagnosing the B1138 code typically involves using a diagnostic scanner to retrieve the specific details of the fault in the Diagnosis Sensor Unit.
6. Can I drive with OBDII code B1138?
It is not recommended to drive with the B1138 code present, as it indicates a potential problem with the airbag system that may compromise safety.
7. How can I repair OBDII code B1138?
Repairing the B1138 code usually involves inspecting and repairing the Diagnosis Sensor Unit, checking and repairing any wiring issues, or replacing faulty components in the airbag system.
8. Will resetting the OBDII code B1138 make it go away?
Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.
9. Can I fix OBDII code B1138 myself?
While some DIY enthusiasts may attempt to address the B1138 code, it is recommended to have the issue diagnosed and repaired by a qualified mechanic due to the safety implications of airbag system malfunctions.
10. How much does it cost to fix OBDII code B1138?
The cost of fixing the B1138 code can vary depending on the specific cause of the issue, with potential expenses for parts and labor ranging from a few hundred to over a thousand dollars.
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