B1139 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
- B1139 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 B1139 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 B1139?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1139?
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 B1139 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 B1139 code?
Need more information on how to fix the B1139 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1139 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B1139 Infiniti — Diagnosis Sensor Unit
- B1139 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 B1139 Code
What does OBDII code B1139 mean?
OBDII code B1139 refers to a malfunction in the diagnosis sensor unit, which is responsible for monitoring various vehicle systems and providing data to the engine control module.
What are common symptoms of the B1139 code?
Common symptoms include warning lights on the dashboard, issues with the vehicle's electrical systems, and potential malfunctions in safety features such as airbags or stability control.
What could cause the B1139 code to trigger?
Causes may include a faulty diagnosis sensor unit, damaged wiring or connectors, a blown fuse, or software issues within the vehicle’s computer system.
How can I diagnose the issue related to code B1139?
To diagnose B1139, use an OBDII scanner to confirm the code, visually inspect the wiring and connectors for damage, and check the sensor’s operation with a multimeter or diagnostic tool.
What repairs are typically needed to fix code B1139?
Repairs may involve replacing the faulty diagnosis sensor unit, repairing or replacing damaged wiring or connectors, or resetting the vehicle’s computer system after addressing the underlying issue.
Can I drive my vehicle if the B1139 code is active?
While you can technically drive the vehicle, it is not recommended as it may affect safety features and overall vehicle performance. It’s best to have it diagnosed and repaired promptly.
Will clearing the B1139 code fix the problem?
Clearing the code may temporarily turn off the warning light, but if the underlying issue is not resolved, the code will likely reappear after a short drive cycle.
Is code B1139 serious?
Yes, code B1139 can be serious as it may indicate a problem with essential vehicle safety features. It’s important to address the issue to ensure vehicle reliability and safety.
How much does it typically cost to repair the B1139 code?
Repair costs can vary widely depending on the exact issue, but expect to pay anywhere from $100 to $500 or more, depending on whether it’s a simple wiring fix or a sensor replacement.
Can I fix the B1139 code myself?
If you have automotive repair experience, you may be able to troubleshoot and repair the issue, especially if it involves checking wiring or replacing fuses. However, more complex problems may require professional diagnostics and repair.
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