B108B Ford Code - Start Button Circuit 'A'
Quick Answer
Conventional Ignition Switch: The ignition switch is a multiple position rotary switch that is controlled by a lock cylinder and a key. Common causes include Faulty Start Button Switch, Start Button Switch harness is open or shorted, Start Button Switch circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- B108B Ford indicates Start Button Circuit 'A'.
- Common causes
- Common causes include Faulty Start Button Switch, Start Button Switch harness is open or shorted, Start Button Switch circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code B108B Ford Description
The ignition switch is a multiple position rotary switch that is controlled by a lock cylinder and a key. The ignition switch provides voltage to the ACC, ON, or START-designated circuits depending on the position it is placed. The Body Control Module (BCM) calculates the positions based on the voltage received from the ACC and ON-designated circuits.
The key removal inhibit solenoid (also known as the key release interlock actuator) is an electronically controlled solenoid that prevents the ignition lock cylinder from being turned to the OFF position unless the gear selector lever is in the PARK position. The key removal inhibit solenoid is part of the ignition switch.
Push Button Ignition Switch:
The push button ignition switch is used instead of a conventional ignition switch to achieve the various ignition modes. The push button ignition switch is a momentary dual contact switch. Both sets of contacts are normally open and receive the voltage at all times. When the START/STOP button is pressed, the voltage is sent to the BCM, the RFA module, and the PCM to indicate a button press.
The ignition switch has a LED for switch illumination when the backlighting is activated.
What are the Possible Causes of the DTC B108B Ford?
- Faulty Start Button Switch
- Start Button Switch harness is open or shorted
- Start Button Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B108B Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B108B:24 Start Button Circuit 'A' Signal Stuck High
B108B:2F Start Button Circuit 'A' Signal Erratic
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B108B Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B108B Ford code?
Need more information on how to fix the B108B Ford code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B108B Ford code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B108B Ford Code
1. What are common symptoms of OBDII code B108B Ford (Start Button Circuit 'A')?
- Common symptoms include the inability to start the vehicle using the start button, intermittent starting issues, and potential illumination of the Check Engine Light.
2. What are the possible causes of OBDII code B108B Ford?
- The code may be triggered by a faulty start button, issues with the start button circuit wiring, a defective starter relay, or a problem with the vehicle's electronic control module.
3. How can I diagnose the cause of OBDII code B108B Ford?
- Diagnosing this code typically involves checking the start button functionality, inspecting the wiring for any damage or loose connections, testing the starter relay, and using a diagnostic scan tool to read the code and gather additional information.
4. Can I continue driving with OBDII code B108B Ford present?
- It is not recommended to continue driving with this code present, as it could lead to potential starting issues and further damage to the vehicle's electrical system.
5. How do I repair OBDII code B108B Ford?
- Repair options may include replacing the faulty start button, repairing or replacing damaged wiring in the start button circuit, replacing the starter relay if needed, or reprogramming the electronic control module, depending on the root cause of the issue.
6. Are there any DIY tips for troubleshooting OBDII code B108B Ford?
- DIY tips may include checking for loose connections at the start button, visually inspecting the wiring for any obvious damage, and ensuring the start button is functioning properly by testing it for continuity.
7. Can a professional mechanic help with diagnosing and repairing OBDII code B108B Ford?
- Yes, a skilled mechanic with experience in automotive electrical systems can efficiently diagnose the issue using specialized tools and knowledge, as well as recommend the appropriate repairs to resolve the code.
8. What are the potential risks of ignoring OBDII code B108B Ford?
- Ignoring this code can result in continued starting issues, potential stalling of the vehicle, and increased risk of complete start button failure, which can leave you stranded without warning.
9. Is OBDII code B108B Ford specific to certain Ford models?
- Yes, this code is specific to Ford vehicles and pertains to issues related to the start button circuit 'A' in those particular models.
10. How can I prevent OBDII code B108B Ford from occurring in the future?
- Regularly inspecting the start button and its associated wiring for any signs of wear or damage, addressing any starting issues promptly, and following the manufacturer's recommended maintenance schedule can help prevent this code from occurring.
Discuss the causes and fixes for B108B Ford OBDII Code
Code B108B Ford comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
