B108B Mercury 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 Mercury 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 Mercury 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 Mercury?
- 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 Mercury?
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 Mercury 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.
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Frequently Asked Questions about B108B Mercury Code
1. What are the common symptoms of OBDII code B108B in a Mercury related to the Start Button Circuit 'A'?
- Common symptoms include difficulty starting the vehicle, the engine not cranking when the start button is pressed, or the engine starting intermittently.
2. What are the possible causes of OBDII code B108B in a Mercury?
- Possible causes may include a faulty start button, issues with the ignition switch, wiring problems in the start button circuit, or a malfunctioning control module.
3. How can I diagnose the OBDII code B108B in my Mercury related to the Start Button Circuit 'A'?
- Diagnosis involves checking the start button for proper functionality, inspecting the ignition switch and associated wiring, and using a diagnostic scanner to retrieve the trouble codes.
4. Can I still drive my Mercury with the OBDII code B108B present?
- It is not recommended to drive the vehicle with this code active, as it may lead to starting issues and potential stalling while driving.
5. What are some repair tips for fixing OBDII code B108B in a Mercury?
- Repair tips may include replacing the faulty start button, repairing or replacing damaged wiring, checking and potentially replacing the ignition switch, and resetting the trouble code after repairs are made.
6. Is it safe to attempt DIY repairs for OBDII code B108B in a Mercury?
- Depending on your experience and knowledge of automotive systems, you may be able to attempt some DIY repairs. However, if you are unsure, it is best to seek professional help.
7. How much does it typically cost to repair OBDII code B108B in a Mercury?
- The cost of repairs can vary depending on the exact cause of the issue. It may range from a simple fix like replacing a start button to a more complex repair involving the control module.
8. Will resetting the trouble code fix OBDII code B108B in a Mercury permanently?
- Resetting the trouble code may temporarily clear the issue, but if the underlying cause is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root problem.
9. Can extreme weather conditions affect the occurrence of OBDII code B108B in a Mercury?
- Yes, extreme temperatures or moisture exposure can potentially exacerbate issues with the start button circuit, leading to the triggering of the B108B trouble code.
10. How long does it usually take to repair OBDII code B108B in a Mercury?
- The repair time can vary depending on the complexity of the issue. Simple fixes like replacing a start button may take a short time, while more intricate problems might require more extensive repairs and diagnostics, leading to a longer repair process.
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