AutoCodes – RAM – B2390 RAM

B2390 RAM 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 RAM 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 663

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

What does this mean?

What are the Possible Causes of the DTC B2390 RAM?

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

How to Fix the DTC B2390 RAM?

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 RAM 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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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.