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Engine-Codes – Mercury – B1390 Mercury

B1390 Mercury Code - Ambient Light Control Module

Quick Answer

The B1390 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Ambient Light Control Module. Common causes include Faulty ambient light sensor, Wiring or connection issues, Malfunctioning Ambient Light Control Module. 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
B1390 Mercury indicates Ambient Light Control Module.
Common causes
Common causes include Faulty ambient light sensor, Wiring or connection issues, Malfunctioning Ambient Light Control Module.
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 B1390 Mercury Description

The B1390 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Ambient Light Control Module. This module is responsible for automatically adjusting the vehicle's interior and exterior lighting based on the ambient light conditions. When this code is triggered, it indicates a malfunction or communication error within the module, which can lead to various lighting-related issues in the vehicle.

OBDII Code B1390 Mercury - Ambient Light Control Module
B1390 Mercury Code - Ambient Light Control Module

Common Causes of B1390 Mercury

  1. Faulty ambient light sensor.
  2. Wiring or connection issues.
  3. Malfunctioning Ambient Light Control Module.
  4. Water damage or corrosion affecting the lighting system.
  5. Electrical system malfunction or short circuit.

Symptoms of B1390 Mercury

  1. Inconsistent brightness levels of interior lights.
  2. Headlights or taillights not adjusting to ambient light conditions.
  3. Dashboard lights flickering or not functioning properly.
  4. Exterior lights staying on or turning off unexpectedly.
  5. Warning light on the dashboard indicating a lighting system issue.

How to Fix B1390 Mercury

  1. Begin by conducting a thorough inspection of the ambient light sensor, wiring, and connections for any visible damage or corrosion.
  2. Use a multimeter to test the ambient light sensor's functionality and ensure it is sending accurate signals to the control module.
  3. If the sensor and wiring are in good condition, proceed to test the Ambient Light Control Module for proper operation and communication.
  4. Replace any faulty components, such as the sensor or control module, and retest the system to verify that the issue has been resolved.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scanner to ensure the code does not reappear.

Cost to Fix B1390 Mercury

The typical repair costs for addressing the B1390 code related to the Ambient Light Control Module can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, parts for replacing the ambient light sensor or control module can range from $100 to $300, while labor costs may add another $100 to $200 to the total bill. Overall, the total repair cost for this issue could range from $200 to $500, but it's important to note that prices can vary based on factors such as location, vehicle make and model, and the shop's labor rates. It's advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for B1390 Mercury

B1390:83 Ambient Light Control Module: Value of Signal Protection Calculation Incorrect

B1390:87 Ambient Light Control Module: Missing Message

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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 B1390 Mercury Code

1. What are common symptoms of a B1390 OBDII code related to the Ambient Light Control Module in a Mercury?

- Common symptoms include malfunctioning ambient lighting, erratic behavior of interior lights, and issues with automatic light dimming.

2. What typically causes the B1390 OBDII code to trigger in a Mercury's Ambient Light Control Module?

- The code is often triggered by a fault in the ambient light sensor, wiring issues, or a malfunctioning control module.

3. How can I diagnose the cause of a B1390 code in my Mercury's Ambient Light Control Module?

- A thorough inspection of the ambient light sensor, checking the wiring for any damage, and testing the control module can help diagnose the issue.

4. Are there any simple repairs I can try to fix the B1390 OBDII code in my Mercury?

- Basic repairs include checking and cleaning the ambient light sensor, ensuring all wiring connections are secure, and resetting the control module.

5. Is it safe to continue driving my Mercury with a B1390 OBDII code related to the Ambient Light Control Module?

- While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential safety hazards or further damage to the lighting system.

6. Can a DIY enthusiast easily fix the B1390 OBDII code in a Mercury's Ambient Light Control Module?

- Depending on the root cause of the code, DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides or consulting service manuals.

7. How much does it typically cost to repair a B1390 OBDII code in a Mercury's Ambient Light Control Module at a professional repair shop?

- Repair costs can vary depending on the specific cause of the code and labor rates, but the average cost ranges from $150 to $400 for parts and labor.

8. Will resetting the OBDII system clear the B1390 code related to the Ambient Light Control Module in my Mercury?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

9. Can extreme weather conditions affect the triggering of the B1390 OBDII code in a Mercury's Ambient Light Control Module?

- Yes, extreme temperatures or exposure to direct sunlight can sometimes impact the functionality of the ambient light sensor, leading to the code being triggered.

10. How can I prevent the B1390 OBDII code from recurring in my Mercury's Ambient Light Control Module after repairs?

- To prevent the code from reoccurring, it's essential to ensure proper installation of components, regular maintenance of the lighting system, and addressing any underlying issues promptly.

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