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B2390 Chrysler Code - Mist Switch Circuit Low

Quick Answer

The B2390 Chrysler code refers to the Mist Switch Circuit Low, indicating that there is a problem with the circuit that controls the mist function on the windshield wiper system. Common causes include Faulty mist switch, Damaged wiring or connectors in the mist switch circuit, Corrosion or moisture in the circuit. 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 Chrysler indicates Mist Switch Circuit Low.
Common causes
Common causes include Faulty mist switch, Damaged wiring or connectors in the mist switch circuit, Corrosion or moisture in the circuit.
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 08, 2024
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Code B2390 Chrysler Description

The B2390 Chrysler code refers to the Mist Switch Circuit Low, indicating that there is a problem with the circuit that controls the mist function on the windshield wiper system. When this code is triggered, it means that the voltage in the circuit is lower than the specified threshold, causing the mist function to malfunction. This issue can affect the vehicle's performance by hindering the driver's visibility during adverse weather conditions, such as rain or snow. The mist function is designed to provide a quick burst of windshield washer fluid to help clear the windshield for improved visibility, so a malfunction in this circuit can compromise the driver's ability to see clearly, potentially leading to safety hazards on the road.

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

Common Causes of B2390 Chrysler

  1. Faulty mist switch.
  2. Damaged wiring or connectors in the mist switch circuit.
  3. Corrosion or moisture in the circuit.
  4. Defective windshield washer fluid pump.
  5. Issues with the control module that regulates the mist function.

Symptoms of B2390 Chrysler

  1. Inability to activate the mist function on the windshield wiper system.
  2. Intermittent operation of the mist function.
  3. Malfunctioning windshield washer fluid pump.
  4. Diminished visibility during rainy or snowy weather.

How to Fix B2390 Chrysler

  1. Begin by diagnosing the specific cause of the Mist Switch Circuit Low code using a diagnostic scanner to pinpoint the exact source of the issue.
  2. Inspect the mist switch, wiring, and connectors for any signs of damage, corrosion, or loose connections. Replace or repair any faulty components as needed.
  3. Test the windshield washer fluid pump to ensure it is functioning correctly. Replace the pump if it is malfunctioning.
  4. Check the control module for any faults or issues that may be affecting the mist function. Replace the control module if necessary.
  5. Clear the diagnostic trouble codes from the vehicle's system after completing the repairs to reset the mist function and ensure that the code does not reappear.

Cost to Fix B2390 Chrysler

The typical repair costs for addressing the Mist Switch Circuit Low code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a mist switch, repairing wiring or connectors, or replacing a windshield washer fluid pump can range from $100 to $300, including parts and labor. However, if the issue is more complex and requires replacing the control module or other components, the repair costs could be higher. It's important to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to consult with a qualified mechanic or technician to get an accurate estimate for addressing the Mist Switch Circuit Low code.

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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 Chrysler Code

1. What does the OBDII code B2390 mean for Chrysler vehicles?

The B2390 code indicates a "Mist Switch Circuit Low" fault, which means the vehicle's Body Control Module (BCM) has detected a low voltage or malfunction in the windshield mist switch circuit.

2. What are the symptoms of the B2390 code in a Chrysler?

Common symptoms include non-functional or erratic operation of the windshield mist (single wipe) mode and possible warning lights on the dashboard.

3. What causes the B2390 code to appear?

Causes can include a faulty mist switch, damaged wiring or connectors in the mist switch circuit, or an issue with the Body Control Module (BCM).

4. How is the B2390 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the mist switch and its wiring for damage or loose connections, and possibly test the voltage in the circuit.

5. Can I drive my Chrysler with the B2390 code active?

Yes, but with limited windshield wiper functionality, which could be dangerous in bad weather. It’s best to address the issue promptly.

6. How do I fix the B2390 code on my Chrysler?

Repairs may involve replacing the mist switch, repairing the wiring or connectors, or reprogramming or replacing the BCM if it’s faulty.

7. How much does it cost to fix the B2390 code?

Costs can vary, but replacing a mist switch typically ranges from $50 to $150, while wiring repairs or BCM replacement may cost more depending on labor and parts.

8. Can a dead battery cause the B2390 code?

A weak or dead battery is unlikely to directly cause this code but can contribute to electrical issues that might affect the mist switch circuit.

9. Is the B2390 code a common issue in Chrysler vehicles?

It’s not a very common code but can occur in vehicles with aging electrical components or after exposure to water or corrosion.

10. Do I need a professional to fix the B2390 code?

While some fixes, like checking connectors, can be done by DIYers, diagnosing and repairing electrical circuits often requires professional tools and expertise.

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