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Engine-Codes – Generic – B118C

B118C Code - BSM Indicator Light Left Circuit Malfunction

Quick Answer

The B118C diagnostic trouble code (DTC) refers to a malfunction in the Blind Spot Monitoring (BSM) indicator light circuit on the left side of the vehicle. Common causes include Faulty wiring or connections in the BSM indicator light circuit, Defective BSM indicator light, Malfunctioning BSM control module. 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
B118C indicates BSM Indicator Light Left Circuit Malfunction.
Common causes
Common causes include Faulty wiring or connections in the BSM indicator light circuit, Defective BSM indicator light, Malfunctioning BSM control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B118C Description

The B118C diagnostic trouble code (DTC) refers to a malfunction in the Blind Spot Monitoring (BSM) indicator light circuit on the left side of the vehicle. The BSM system uses sensors to detect other vehicles in the driver's blind spots and alerts the driver through indicator lights on the side mirrors or dashboard. When this circuit malfunctions, it can affect the proper functioning of the BSM system, potentially compromising the driver's ability to be aware of vehicles in their blind spots.

OBDII Code B118C - BSM Indicator Light Left Circuit Malfunction
B118C Code - BSM Indicator Light Left Circuit Malfunction

Common Causes of B118C

  1. Faulty wiring or connections in the BSM indicator light circuit.
  2. Defective BSM indicator light.
  3. Malfunctioning BSM control module.
  4. Water or moisture intrusion in the BSM system.
  5. Damage to the BSM sensors or related components.

Symptoms of B118C

  1. BSM indicator light on the left side not illuminating.
  2. False alerts or no alerts from the BSM system.
  3. Dashboard warning light related to the BSM system.
  4. Inconsistent or erratic behavior of the BSM system.

How to Fix B118C

  1. Diagnose the issue by using a scan tool to read the DTC and identify the specific cause of the malfunction.
  2. Inspect the wiring, connections, and components in the BSM indicator light circuit for any damage or corrosion.
  3. Test the BSM indicator light and replace it if necessary.
  4. Check the BSM control module for proper functioning and replace if found to be faulty.
  5. Clear the DTC and test the BSM system to ensure proper operation.

Cost to Fix B118C

The cost of repairing a B118C code related to a BSM indicator light left circuit malfunction can vary depending on the specific cause of the issue. In general, the cost of parts such as a new BSM indicator light or control module can range from $50 to $300, while labor costs can add an additional $100 to $200. Overall, the total repair cost can be estimated to be between $150 and $500. It's important to note that these are rough estimates, and actual costs may differ based on various factors. Be sure to consult with a qualified mechanic or auto repair shop for a more accurate assessment.

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Code B118C Information for Specific Makes

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 B118C Code

1. What are the common symptoms of OBDII code B118C (BSM Indicator Light Left Circuit Malfunction)?

The common symptoms include the left blind spot monitoring (BSM) indicator light not illuminating or flashing on the dashboard.

2. What can cause the B118C OBDII code to trigger?

The B118C code is typically triggered by a malfunction in the circuit that controls the left BSM indicator light, which can be caused by wiring issues, a faulty indicator light, or a problem with the BSM module.

3. How serious is a BSM Indicator Light Left Circuit Malfunction?

While the malfunction may not directly affect the drivability of the vehicle, it can impact the effectiveness of the blind spot monitoring system in detecting vehicles in the left blind spot, potentially compromising safety.

4. How can I diagnose the cause of the B118C code?

Diagnosing the B118C code involves visually inspecting the wiring and connections related to the left BSM indicator light, testing the indicator light itself, and using a scan tool to check for faults in the BSM module.

5. Can I repair the BSM Indicator Light Left Circuit Malfunction myself?

If you have experience with automotive electrical systems and the necessary tools, you may be able to repair the issue yourself by addressing wiring faults, replacing the indicator light, or repairing the BSM module. Otherwise, it's recommended to seek professional assistance.

6. Will the B118C code reset on its own after repairs are made?

Once the underlying issue causing the B118C code is resolved, you may need to clear the code using an OBDII scan tool to reset the system and turn off the warning light on the dashboard.

7. Are there any temporary solutions for the BSM Indicator Light Left Circuit Malfunction?

If you encounter the B118C code and the left BSM indicator light isn't working, you can manually check your blind spots more frequently while driving to compensate for the lack of visual alerts.

8. How much does it typically cost to repair a BSM Indicator Light Left Circuit Malfunction?

The cost of repairing the B118C code can vary depending on the cause of the issue, the extent of the repairs needed, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic.

9. Can a BSM Indicator Light Left Circuit Malfunction cause other issues in the vehicle?

While the B118C code specifically relates to the left BSM indicator light circuit, it's essential to address the malfunction promptly to prevent any potential impact on the overall functionality of the blind spot monitoring system.

10. Is it safe to continue driving with the B118C OBDII code present?

While driving with the B118C code may not pose an immediate safety risk, it's still recommended to address the issue promptly to ensure the proper functioning of the blind spot monitoring system and maintain optimal safety on the road.

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