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Engine-Codes – Generic – B108C

B108C Code - Start Button Circuit 'B'

Quick Answer

The B108C diagnostic trouble code (DTC) refers to a potential issue with the start button circuit 'B' in a vehicle. Common causes include Faulty start button switch, Wiring issues such as shorts, open circuits, or damaged wiring, Faulty ignition switch. 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
B108C indicates Start Button Circuit 'B'.
Common causes
Common causes include Faulty start button switch, Wiring issues such as shorts, open circuits, or damaged wiring, Faulty ignition switch.
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 08, 2024
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Code B108C Description

The B108C diagnostic trouble code (DTC) refers to a potential issue with the start button circuit 'B' in a vehicle. This code indicates that there is a malfunction or fault in the circuit that controls the vehicle's start button. The start button is a crucial component of a modern vehicle's ignition system, allowing the driver to start and stop the engine with the push of a button. When this circuit malfunctions, it can lead to starting issues, potentially leaving the vehicle stranded.

OBDII Code B108C - Start Button Circuit 'B'
B108C Code - Start Button Circuit 'B'

Common Causes of B108C

  1. Faulty start button switch.
  2. Wiring issues such as shorts, open circuits, or damaged wiring.
  3. Faulty ignition switch.
  4. Defective control module responsible for the start button circuit.
  5. Corrosion or poor connections in the circuit.

Symptoms of B108C

  1. Engine does not start when the start button is pressed.
  2. Intermittent starting issues where the engine may start occasionally.
  3. The start button may feel unresponsive or require multiple presses to start the engine.
  4. Dashboard warning lights related to the engine or ignition system may illuminate.
  5. The vehicle may stall while driving due to the start button circuit malfunction.

How to Fix B108C

  1. Diagnose the issue by using a diagnostic scan tool to retrieve the DTC and test the start button circuit for continuity and proper voltage.
  2. Inspect the start button switch for any visible damage or malfunction.
  3. Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  4. Test the ignition switch and control module for proper function and replace if found faulty.
  5. Clear the DTC and perform a test start to ensure the issue is resolved.

Cost to Fix B108C

The cost of repairing a start button circuit 'B' issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, the cost of parts for this repair may range from $50 to $200, while labor costs can range from $100 to $300. Keep in mind that these are rough estimates, and actual costs may vary. It's advisable to consult with a professional mechanic or auto repair shop for a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for B108C

B108C:23 Start Button Circuit 'B' Signal Stuck Low
B108C:24 Start Button Circuit 'B' Signal Stuck High
B108C:2F Start Button Circuit 'B' Signal Erratic

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Code B108C 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 B108C Code

1. What are the common symptoms of OBDII code B108C (Start Button Circuit 'B')?

Common symptoms include the inability to start the vehicle using the push-button start, intermittent starting issues, and the engine stalling unexpectedly.

2. What are the possible causes of OBDII code B108C?

Possible causes of this code include a faulty start button switch, a wiring issue in the start button circuit, a malfunctioning ignition switch, or a problem with the vehicle's electronic control module.

3. How can I diagnose the cause of OBDII code B108C?

Diagnosing the cause of this code typically involves using a scan tool to retrieve the code, checking the wiring and connections in the start button circuit, testing the start button switch for proper operation, and inspecting the ignition switch for any faults.

4. Can I drive my vehicle with OBDII code B108C?

It is not recommended to drive your vehicle with this code present, as it can lead to starting issues or unexpected stalling, which can be dangerous. It is best to address the issue promptly.

5. How can I repair OBDII code B108C?

Repairing this code may involve replacing the faulty start button switch, repairing any damaged wiring in the circuit, replacing the ignition switch if necessary, or reprogramming the electronic control module.

6. Will OBDII code B108C cause permanent damage to my vehicle?

While the code itself may not cause permanent damage, ignoring the underlying issue can lead to further complications with the vehicle's starting system, potentially resulting in more severe damage over time.

7. Can I reset OBDII code B108C on my own?

You can attempt to clear the code using an OBDII scanner, but it is important to first diagnose and address the root cause of the code to prevent it from reoccurring.

8. How much does it cost to repair OBDII code B108C?

The cost of repairing this code can vary depending on the specific cause of the issue, the parts needed for repair, and the labor rates of the mechanic or dealership. It is recommended to obtain quotes from different sources for an accurate estimate.

9. Is OBDII code B108C a common issue in certain vehicle makes and models?

This code can be more common in vehicles equipped with push-button start systems, particularly in certain makes and models known for issues with their starting systems. Conducting research specific to your vehicle can provide more insight.

10. Can a DIY enthusiast repair OBDII code B108C?

Depending on your level of automotive expertise and access to tools, some DIY enthusiasts may be able to diagnose and repair this code themselves. However, it is important to have the necessary knowledge and skills to work on the vehicle's starting system safely and effectively.

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