B1108 Code - Diagnosis Sensor Unit

Quick Answer

The B1108 diagnostic code refers to an issue with the Diagnosis Sensor Unit in the vehicle. Common causes include Faulty Wiring: Issues with the wiring connected to the sensor unit can cause the B1108 code to be triggered, Malfunctioning Sensor Unit: The sensor unit itself may be faulty or damaged, leading to performance issues, Onboard Computer Problems: Issues with the vehicle's onboard computer can also contribute to the B1108 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

B1108 indicates Diagnosis Sensor Unit.

Common causes

Common causes include Faulty Wiring: Issues with the wiring connected to the sensor unit can cause the B1108 code to be triggered, Malfunctioning Sensor Unit: The sensor unit itself may be faulty or damaged, leading to performance issues, Onboard Computer Problems: Issues with the vehicle's onboard computer can also contribute to the B1108 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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
• Comments
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Common Causes of B1108

Symptoms of B1108

How to Fix B1108

Cost to Fix B1108

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Code B1108 Information for Specific Makes

• B1108 Ford — Driver Door Central Locking Motor Commanded Position Not Reachable
• B1108 Infiniti — Diagnosis Sensor Unit
• B1108 Lincoln — Driver Door Central Locking Motor Commanded Position Not Reachable
• B1108 Mercury — Driver Door Central Locking Motor Commanded Position Not Reachable
• B1108 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.

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 B1108 Code

1. What are common symptoms of OBDII code B1108 related to the Diagnosis Sensor Unit?

- Common symptoms include issues with the airbag system, such as the airbag warning light staying on or flashing.

2. What are possible causes of OBDII code B1108 related to the Diagnosis Sensor Unit?

- Causes may include a faulty diagnosis sensor unit, poor electrical connections, or damaged wiring.

3. How can I diagnose the Diagnosis Sensor Unit issue causing OBDII code B1108?

- Diagnosis typically involves using a diagnostic scan tool to read the code and then inspecting the diagnosis sensor unit and related wiring for any visible damage.

4. Can I repair the Diagnosis Sensor Unit problem causing OBDII code B1108 myself?

- Depending on your skill level and access to tools, you may be able to repair the issue by replacing the diagnosis sensor unit, fixing electrical connections, or repairing damaged wiring.

5. Is it safe to drive with OBDII code B1108 related to the Diagnosis Sensor Unit?

- It is not recommended to drive with this code present, as it indicates a potential issue with the airbag system, which is crucial for safety in the event of a collision.

6. How much does it cost to repair OBDII code B1108 related to the Diagnosis Sensor Unit?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve part replacement and labor costs, which can range from a few hundred to over a thousand dollars.

7. Are there any common DIY fixes for resolving OBDII code B1108 related to the Diagnosis Sensor Unit?

- DIY fixes may include checking and securing electrical connections, inspecting and repairing damaged wiring, or replacing the diagnosis sensor unit if needed.

8. Can resetting the OBDII system clear the B1108 code related to the Diagnosis Sensor Unit?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the diagnosis sensor unit is not addressed, the code is likely to reappear.

9. How urgent is it to address OBDII code B1108 related to the Diagnosis Sensor Unit?

- It is important to address this code promptly, as it indicates a potential problem with the airbag system, which is a critical safety component in your vehicle.

10. What should I do if OBDII code B1108 persists after attempting repairs related to the Diagnosis Sensor Unit?

- If the code persists after attempted repairs, it may be necessary to seek assistance from a professional mechanic with specialized diagnostic tools to pinpoint and resolve the issue.