B1139 Code - Diagnosis Sensor Unit
Quick Answer
The B1139 diagnostic code pertains to the Diagnosis Sensor Unit in a vehicle. Common causes include Wiring Issues: Damaged or corroded wiring connecting the sensor unit can disrupt communication and cause the B1139 code, Sensor Unit Failure: The sensor unit itself may be faulty or damaged, leading to inaccurate readings and triggering the code, Software Glitches: Software issues within the onboard computer system can interfere with the sensor unit's operation and trigger the code. 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 Wiring Issues: Damaged or corroded wiring connecting the sensor unit can disrupt communication and cause the B1139 code, Sensor Unit Failure: The sensor unit itself may be faulty or damaged, leading to inaccurate readings and triggering the code, Software Glitches: Software issues within the onboard computer system can interfere with the sensor unit's operation and trigger the code.
- 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 B1139 Description
The B1139 diagnostic code pertains to the Diagnosis Sensor Unit in a vehicle. This unit is responsible for monitoring various systems and components in the vehicle and detecting any malfunctions or abnormalities. When this code appears, it indicates that there is a problem with the sensor unit itself, which can lead to issues with the vehicle's overall performance and functionality.
Common Causes of B1139
- Wiring Issues: Damaged or corroded wiring connecting the sensor unit can disrupt communication and cause the B1139 code.
- Sensor Unit Failure: The sensor unit itself may be faulty or damaged, leading to inaccurate readings and triggering the code.
- Software Glitches: Software issues within the onboard computer system can interfere with the sensor unit's operation and trigger the code.
- Environmental Factors: Extreme temperatures or exposure to moisture can damage the sensor unit and lead to malfunctions.
- Electrical Problems: Issues with the vehicle's electrical system, such as a weak battery or alternator, can affect the sensor unit's performance.
Symptoms of B1139
- Check Engine Light: The most common symptom associated with the B1139 code is the illumination of the check engine light on the dashboard.
- Inaccurate Readings: The vehicle may display incorrect data or readings on the dashboard, such as fuel levels, temperature, or speed.
- Engine Misfires: The engine may experience misfires or rough idling due to the sensor unit's malfunction.
- Decreased Performance: The vehicle may exhibit decreased performance, such as sluggish acceleration or difficulty shifting gears.
- Increased Emissions: A faulty Diagnosis Sensor Unit can lead to increased emissions output, potentially causing the vehicle to fail emissions tests.
How to Fix B1139
- Diagnostic Testing: Begin by using a diagnostic scanner to retrieve the specific code and identify the source of the issue.
- Inspect Wiring: Check the wiring connecting the sensor unit for any visible damage or corrosion. Repair or replace as needed.
- Test Sensor Unit: Test the sensor unit itself to determine if it is functioning correctly. Replace if found to be faulty.
- Clear Codes: Clear the diagnostic trouble codes from the vehicle's computer system and reset the check engine light.
- Relearn Procedures: Perform any necessary relearn procedures for the sensor unit to ensure proper calibration and functionality.
Cost to Fix B1139
The typical repair costs for addressing the B1139 code can range from $150 to $500, including parts and labor. However, the specific costs can vary depending on the vehicle's make and model, the severity of the issue, and the labor rates at the auto repair shop. It's advisable to consult with a professional technician to get an accurate estimate based on your specific circumstances. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Check local rates for a more precise cost estimate for resolving the B1139 diagnostic code.
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Code B1139 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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