B1138 Infiniti Code - Diagnosis Sensor Unit
Quick Answer
The B1138 code in Infiniti vehicles refers to an issue with the Diagnosis Sensor Unit. Common causes include Faulty Sensor Unit: The most common cause of the B1138 code is a malfunctioning Diagnosis Sensor Unit, Wiring Issues: Damage to the wiring harness connected to the sensor unit can disrupt communication and trigger the code, Corrosion: Corrosion or moisture intrusion in the sensor unit can lead to malfunctions. 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 Infiniti indicates Diagnosis Sensor Unit.
- Common causes
- Common causes include Faulty Sensor Unit: The most common cause of the B1138 code is a malfunctioning Diagnosis Sensor Unit, Wiring Issues: Damage to the wiring harness connected to the sensor unit can disrupt communication and trigger the code, Corrosion: Corrosion or moisture intrusion in the sensor unit can lead to malfunctions.
- 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 B1138 Infiniti Description
The B1138 code in Infiniti vehicles refers to an issue with the Diagnosis Sensor Unit. This unit 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 implications for the overall performance and safety of the vehicle.
Common Causes of B1138 Infiniti
- Faulty Sensor Unit: The most common cause of the B1138 code is a malfunctioning Diagnosis Sensor Unit.
- Wiring Issues: Damage to the wiring harness connected to the sensor unit can disrupt communication and trigger the code.
- Corrosion: Corrosion or moisture intrusion in the sensor unit can lead to malfunctions.
- Software Glitch: An issue with the vehicle's onboard computer or software can also cause the B1138 code to appear.
- Electrical Interference: External factors such as electromagnetic interference can disrupt the sensor unit's operation.
Symptoms of B1138 Infiniti
- Check Engine Light: The most common symptom associated with the B1138 code is the illumination of the check engine light on the dashboard.
- Poor Performance: The vehicle may exhibit sluggish acceleration, rough idling, or difficulty starting.
- Reduced Fuel Efficiency: Drivers may notice a decrease in fuel efficiency, requiring more frequent trips to the gas station.
- Transmission Issues: The transmission may shift erratically or experience delays in response to driver input.
- Electrical Problems: The vehicle's electrical systems, such as power windows or door locks, may not function properly.
How to Fix B1138 Infiniti
- Diagnostic Testing: The first step in addressing the B1138 code is to perform diagnostic testing to pinpoint the exact cause of the issue.
- Sensor Unit Replacement: If the sensor unit is found to be faulty, it will need to be replaced with a new unit.
- Wiring Inspection: Check the wiring harness for any damage or corrosion, and repair or replace as needed.
- Software Update: Updating the vehicle's software may resolve any underlying software glitches causing the code.
- Clearing Codes: After completing the repairs, clear the diagnostic codes and reset the vehicle's computer to ensure the issue has been resolved.
Cost to Fix B1138 Infiniti
The cost of repairing the B1138 code in an Infiniti vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts for replacing the Diagnosis Sensor Unit can range from $200 to $500, while labor costs can add an additional $100 to $200. Overall, drivers can expect to pay between $300 and $700 for resolving this issue. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the shop's labor rates. Be sure to consult with a qualified mechanic for a more accurate cost estimate.
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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.
Frequently Asked Questions about B1138 Infiniti Code
1. What does the OBDII code B1138 mean on an Infiniti?
The code B1138 indicates a problem with the Diagnosis Sensor Unit, which is part of the airbag system responsible for detecting impacts and deploying airbags.
2. What are the symptoms of code B1138 in an Infiniti?
Common symptoms include the airbag warning light staying on, issues with airbag deployment, and possibly no visible signs of system failure beyond the warning light.
3. What causes the B1138 code to appear?
This code can be triggered by a faulty diagnosis sensor unit, damaged wiring or connectors, or corrosion that disrupts communication within the airbag system.
4. Can I drive my Infiniti with the B1138 code active?
While the vehicle can still be driven, the airbag system may not function correctly in an accident, posing a safety risk. It’s recommended to address the issue promptly.
5. How do you fix the B1138 code on an Infiniti?
Repair typically involves inspecting and replacing the diagnosis sensor unit if it’s faulty, checking for damaged wiring, and ensuring all connectors are secure.
6. How much does it cost to fix the B1138 code?
Repair costs vary, but replacing the diagnosis sensor unit can range from $300 to $800, including parts and labor, depending on your vehicle model and location.
7. What tools are needed to diagnose the B1138 code?
You’ll need an OBDII scanner capable of reading airbag system codes and possibly a multimeter to check wiring continuity.
8. Can a dead battery trigger the B1138 code?
A dead or weak battery can sometimes cause communication errors in the airbag system, but this specific code usually points to a problem with the sensor unit itself.
9. Does the B1138 code require reprogramming after repairs?
In most cases, the airbag control module may need to be reset or reprogrammed using a compatible scan tool after the diagnosis sensor unit is replaced.
10. Is the B1138 code covered under warranty?
If your Infiniti is still under warranty and the issue is related to a manufacturing defect, the repair may be covered. Check with your dealer for details.
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