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B2390 RAM Code - Mist Switch Circuit Low

Quick Answer

The B2390 diagnostic trouble code (DTC) refers to a fault in the Mist Switch Circuit, specifically indicating a low voltage condition. Common causes include Faulty mist switch, Wiring issues or shorts in the circuit, Corrosion or poor connections in the electrical system. 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
B2390 RAM indicates Mist Switch Circuit Low.
Common causes
Common causes include Faulty mist switch, Wiring issues or shorts in the circuit, Corrosion or poor connections in the electrical system.
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 07, 2024
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Code B2390 RAM Description

The B2390 diagnostic trouble code (DTC) refers to a fault in the Mist Switch Circuit, specifically indicating a low voltage condition. This code typically affects the vehicle's windshield wiper system, as the mist switch is a component that controls the intermittent wiper function. When this circuit is not functioning properly, it can lead to issues with the wiper system's performance, potentially causing safety concerns during inclement weather conditions.

OBDII Code B2390 RAM - Mist Switch Circuit Low
B2390 RAM Code - Mist Switch Circuit Low

Common Causes of B2390 RAM

  1. Faulty mist switch.
  2. Wiring issues or shorts in the circuit.
  3. Corrosion or poor connections in the electrical system.
  4. Wiper motor malfunction.
  5. Water or moisture intrusion causing electrical problems.

Symptoms of B2390 RAM

  1. Intermittent or inoperative windshield wipers.
  2. Inability to control wiper speed or function.
  3. Wipers not returning to the correct rest position.
  4. Unusual wiper behavior, such as unexpected activation.

How to Fix B2390 RAM

  1. Start by diagnosing the Mist Switch Circuit using a multimeter to test for voltage and continuity.
  2. Inspect the wiring harness for any visible damage, corrosion, or loose connections.
  3. Check the mist switch for proper functionality and replace if necessary.
  4. Test the wiper motor to ensure it is operating correctly and replace if faulty.
  5. Clear any fault codes from the vehicle's computer system and test the wipers to verify proper operation.

Cost to Fix B2390 RAM

The cost of repairing a Mist Switch Circuit low voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. Typically, replacing a mist switch or repairing wiring issues may cost between $100 to $300, including parts and labor. However, if the wiper motor needs to be replaced, the cost could range from $200 to $500. It's recommended to consult with a qualified mechanic or repair shop to get an accurate estimate based on your vehicle's make and model. Remember that diagnostic time and labor rates can vary, so it's advisable to inquire about these costs upfront.

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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 B2390 RAM Code

1. What are common symptoms of OBDII code B2390 RAM related to the Mist Switch Circuit Low?

The common symptoms include issues with the windshield washer system, malfunctioning wiper operation, and potential illumination of the check engine light.

2. What are the possible causes of the OBDII code B2390 RAM for Mist Switch Circuit Low?

Possible causes include a faulty mist switch, damaged wiring or connectors in the mist switch circuit, or a malfunctioning body control module.

3. How can I diagnose the OBDII code B2390 RAM for Mist Switch Circuit Low?

Diagnosis involves inspecting the mist switch and its wiring for any visible damage, testing the switch for proper functionality, and using a scan tool to check for the code and related issues.

4. What is the recommended repair for OBDII code B2390 RAM Mist Switch Circuit Low?

The recommended repair typically involves replacing the faulty mist switch, repairing any damaged wiring or connectors, or reprogramming the body control module if necessary.

5. Can I still drive my vehicle with the OBDII code B2390 RAM Mist Switch Circuit Low?

While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to avoid potential safety hazards or further damage to the windshield wiper system.

6. Are there any DIY tips for troubleshooting OBDII code B2390 RAM Mist Switch Circuit Low?

DIY tips include checking the fuse related to the windshield wiper system, visually inspecting the mist switch and its connections, and using a multimeter to test for continuity in the circuit.

7. How do I reset the OBDII code B2390 RAM Mist Switch Circuit Low after making repairs?

After making the necessary repairs, you can reset the code using an OBDII scan tool or by disconnecting the vehicle's battery for a few minutes to clear the fault memory.

8. Is it common for the OBDII code B2390 RAM Mist Switch Circuit Low to recur after repairs?

If the root cause of the issue is not properly addressed during repairs, the code may recur. It's important to ensure all related components are thoroughly inspected and repaired to prevent recurrence.

9. Can extreme weather conditions affect the occurrence of OBDII code B2390 RAM Mist Switch Circuit Low?

Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate issues with the mist switch circuit and lead to the triggering of this OBDII code.

10. How long does it typically take to repair OBDII code B2390 RAM Mist Switch Circuit Low?

The repair time can vary depending on the specific cause of the issue and the complexity of the repair. It can range from a quick fix, such as replacing a fuse, to a more involved repair, such as replacing the mist switch or repairing wiring.

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