B108C Mercury Code - Start Button Circuit 'B'
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
- B108C Mercury indicates Start Button Circuit 'B'.
- 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 B108C 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 B108C 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 B108C 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
B108C:24 Start Button Circuit 'B' Signal Stuck High
B108C:2F Start Button Circuit 'B' Signal Erratic
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B108C 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 B108C Mercury Code
1. What does OBDII code B108C for Mercury indicate?
The B108C code specifically pertains to a fault in the Start Button Circuit 'B' of the vehicle.
2. What are some common symptoms of OBDII code B108C in a Mercury vehicle?
Common symptoms of B108C may include issues with starting the vehicle using the start button, intermittent or non-responsive start button, or the engine failing to crank.
3. What are the possible causes of OBDII code B108C in a Mercury?
Potential causes of B108C may include a faulty start button switch, damaged wiring or connectors in the start button circuit, or a malfunctioning control module.
4. How can I diagnose the OBDII code B108C in my Mercury?
Diagnosing B108C involves using a diagnostic scanner to retrieve the code, inspecting the start button and its connections, and conducting a thorough examination of the start button circuit components.
5. Can OBDII code B108C be repaired at home?
Simple repairs for B108C, such as checking and cleaning the start button contacts or replacing a faulty start button switch, can be done at home if you have the necessary tools and expertise.
6. Is it safe to continue driving with OBDII code B108C present in my Mercury?
It is not recommended to continue driving with an unresolved B108C code, as it may lead to starting issues or potential safety concerns if the vehicle fails to start unexpectedly.
7. How much does it typically cost to repair OBDII code B108C in a Mercury?
The cost of repairing B108C can vary depending on the specific cause of the issue, but it may range from a few dollars for a simple switch replacement to a few hundred dollars for more complex repairs involving control module replacement.
8. Are there any preventive measures to avoid OBDII code B108C in a Mercury?
To prevent B108C, regular inspection and maintenance of the start button circuit, including checking for loose connections and ensuring the start button is functioning properly, can help avoid potential issues.
9. Can a faulty battery be a potential cause of OBDII code B108C in a Mercury?
While a faulty battery may not directly trigger B108C, it can contribute to starting issues that may manifest as symptoms similar to those associated with the code. It's recommended to check the battery health as part of the diagnostic process.
10. Will resetting the OBDII system clear the B108C code in my Mercury?
Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing B108C is not addressed, the code is likely to reappear upon subsequent start-up or operation of the vehicle.
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