AutoCodes – Generic – B2390

B2390 Code - Mist Switch Circuit Low

Quick Answer

The Cluster monitors the Mist Switch Circuit. Common causes include Faulty Multifunction Switch, Multifunction Switch harness is open or shorted, Multifunction Switch circuit poor electrical connection. 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 indicates Mist Switch Circuit Low.
Common causes: Common causes include Faulty Multifunction Switch, Multifunction Switch harness is open or shorted, Multifunction Switch circuit poor electrical connection.
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.

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Code Popularity 4,456

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2390 Description

The Cluster monitors the Mist Switch Circuit. The Diagnostic Trouble Code (DTC) is set when the Cluster detects the Mist function inoperative.

OBDII Code B2390 - Mist Switch Circuit Low - AutoCodes.com — B2390 Code - Mist Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2390?

Faulty Multifunction Switch
Multifunction Switch harness is open or shorted
Multifunction Switch circuit poor electrical connection
Faulty Cluster

How to Fix the DTC B2390?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2390 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.

Need more information about the B2390 code?

Need more information on how to fix the B2390 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2390 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2390 Chrysler — Mist Switch Circuit Low
B2390 Dodge — Mist Switch Circuit Low
B2390 Jeep — Mist Switch Circuit Low
B2390 RAM — Mist Switch Circuit Low

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 Code

1. What are common symptoms of OBDII code B2390 (Mist Switch Circuit Low)?

- Common symptoms include the windshield wipers not working properly or the mist function not activating as expected.

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

- The code may be triggered by a faulty mist switch, wiring issues, a defective wiper motor, or a blown fuse.

3. How can I diagnose the cause of OBDII code B2390 (Mist Switch Circuit Low)?

- To diagnose the issue, you can visually inspect the mist switch and related wiring, test the switch for continuity, and check the wiper motor and fuse for any faults.

4. Can a DIY enthusiast repair OBDII code B2390 (Mist Switch Circuit Low) at home?

- Depending on the cause, some DIY enthusiasts may be able to repair the issue by replacing the mist switch, fixing wiring problems, or addressing fuse issues.

5. Is it safe to continue driving with OBDII code B2390 (Mist Switch Circuit Low) present?

- It is generally safe to drive with this code present, but you may experience issues with the wipers not functioning properly, especially in rainy conditions.

6. How much does it typically cost to repair OBDII code B2390 (Mist Switch Circuit Low) at a repair shop?

- Repair costs can vary depending on the cause of the code, but it may range from $100 to $300 for parts and labor.

7. Can a scan tool reset OBDII code B2390 (Mist Switch Circuit Low) once the issue is fixed?

- Yes, once the underlying issue is resolved, a scan tool can be used to clear the code from the vehicle's computer system.

8. Are there any preventive maintenance tips to avoid OBDII code B2390 (Mist Switch Circuit Low) in the future?

- Regularly inspecting and maintaining the wiper system, including the mist switch and wiring, can help prevent issues that may trigger this code.

9. Will OBDII code B2390 (Mist Switch Circuit Low) cause the vehicle to fail an emissions test?

- This specific code is related to the wiper system and is unlikely to cause a vehicle to fail an emissions test.

10. Can weather conditions impact the likelihood of OBDII code B2390 (Mist Switch Circuit Low) occurring?

- Extreme weather conditions or prolonged exposure to moisture can potentially contribute to issues with the mist switch circuit, leading to the triggering of this code.