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Engine-Codes – Mercury – B2659 Mercury

B2659 Mercury Code - Courtesy Switch Fault

Quick Answer

The B2659 diagnostic trouble code (DTC) for Mercury vehicles refers to a courtesy switch fault. Common causes include Faulty courtesy light switch, Wiring issues related to the courtesy light circuit, Corrosion or damage to the switch contacts. 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
B2659 Mercury indicates Courtesy Switch Fault.
Common causes
Common causes include Faulty courtesy light switch, Wiring issues related to the courtesy light circuit, Corrosion or damage to the switch contacts.
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 17, 2024
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Code B2659 Mercury Description

The B2659 diagnostic trouble code (DTC) for Mercury vehicles refers to a courtesy switch fault. This code indicates that there is an issue with the courtesy light switch in the vehicle. The courtesy light switch is responsible for turning on the interior lights when the doors are opened or closed. When this switch malfunctions, it can lead to a variety of issues within the vehicle.

OBDII Code B2659 Mercury - Courtesy Switch Fault
B2659 Mercury Code - Courtesy Switch Fault

Common Causes of B2659 Mercury

  1. Faulty courtesy light switch.
  2. Wiring issues related to the courtesy light circuit.
  3. Corrosion or damage to the switch contacts.
  4. Electrical system malfunctions.
  5. Issues with the vehicle's body control module.

Symptoms of B2659 Mercury

  1. Interior lights not turning on when doors are opened.
  2. Interior lights staying on even when doors are closed.
  3. Inconsistent behavior of interior lights.
  4. Battery drain due to interior lights staying on.

How to Fix B2659 Mercury

  1. Begin by diagnosing the specific cause of the courtesy switch fault using a diagnostic scanner.
  2. Inspect the courtesy light switch and wiring for any visible damage or corrosion.
  3. Test the switch for proper functionality and replace if necessary.
  4. Check and repair any wiring issues in the courtesy light circuit.
  5. Reset the vehicle's computer system to clear the DTC and ensure the issue is resolved.

Cost to Fix B2659 Mercury

The typical repair costs for a courtesy switch fault can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the cost of replacing a courtesy light switch and addressing related wiring issues can range from $100 to $300, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary significantly based on location, vehicle make and model, and other factors. It is advisable to obtain a detailed estimate from a qualified mechanic to determine the precise cost for your specific situation.

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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 B2659 Mercury Code

1. What are the common symptoms of OBDII code B2659 (Courtesy Switch Fault) in a Mercury vehicle?

- Common symptoms include interior lights not turning on/off properly, power windows not functioning correctly, and issues with the courtesy or dome light.

2. What could cause the OBDII code B2659 (Courtesy Switch Fault) to trigger in a Mercury car?

- The code may be triggered by a faulty courtesy switch, wiring issues, a blown fuse, or a malfunctioning control module.

3. How can I diagnose the Courtesy Switch Fault in my Mercury vehicle?

- You can use a diagnostic scanner to retrieve the specific code B2659. Check the courtesy switch for proper operation and inspect the wiring and fuse related to the interior lights.

4. What are some DIY repair tips for fixing the Courtesy Switch Fault in a Mercury car?

- Start by checking and replacing any blown fuses related to the interior lights. Inspect the courtesy switch for proper functionality and replace it if necessary. Ensure all wiring connections are secure.

5. Can the OBDII code B2659 (Courtesy Switch Fault) be cleared/reset in a Mercury vehicle?

- Yes, after fixing the underlying issue causing the code, you can clear/reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes.

6. Is it safe to continue driving with the OBDII code B2659 (Courtesy Switch Fault) present in a Mercury car?

- While the issue may not affect the drivability of the vehicle, it is essential to address the problem promptly to prevent potential electrical issues or drain on the battery.

7. How much does it typically cost to repair the Courtesy Switch Fault in a Mercury vehicle?

- The cost of repair can vary depending on the root cause of the issue. Simple fixes like replacing a fuse or the courtesy switch may cost less, while addressing wiring or control module problems could be more expensive.

8. Are there any recalls or technical service bulletins related to the OBDII code B2659 (Courtesy Switch Fault) in Mercury vehicles?

- It is advisable to check with a Mercury dealership or visit the manufacturer's website to see if there are any relevant recalls or technical service bulletins related to this specific OBDII code.

9. Will fixing the Courtesy Switch Fault OBDII code require professional assistance, or can it be done by a DIY enthusiast?

- Depending on the complexity of the issue, DIY enthusiasts with basic automotive knowledge may be able to address and repair the Courtesy Switch Fault. However, if unsure, it is recommended to seek professional help.

10. How can I prevent the OBDII code B2659 (Courtesy Switch Fault) from reoccurring in my Mercury vehicle?

- Regularly inspect and maintain the interior lighting components, including the courtesy switch, wiring, and fuses. Address any issues promptly to prevent the code from reoccurring.

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