B2390 Code - Mist Switch Circuit Low
Quick Answer
The B2390 code indicates a fault in the mist switch circuit, specifically that the circuit is registering a low voltage. Common causes include Faulty mist switch: The mist switch itself may be defective and not sending the correct signal to the wiper motor, Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of voltage and cause a low voltage reading, Wiper motor control module failure: A malfunctioning control module can prevent the mist function from activating correctly. 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 mist switch: The mist switch itself may be defective and not sending the correct signal to the wiper motor, Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of voltage and cause a low voltage reading, Wiper motor control module failure: A malfunctioning control module can prevent the mist function from activating correctly.
- 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 B2390 Description
The B2390 code indicates a fault in the mist switch circuit, specifically that the circuit is registering a low voltage. The mist switch, commonly found on the windshield wiper control stalk, is used to activate a single wipe of the windshield wipers for a quick cleaning of the windshield. When this circuit is not functioning properly, it can affect the overall performance of the windshield wipers and potentially compromise visibility during adverse weather conditions.
Common Causes of B2390
- Faulty mist switch: The mist switch itself may be defective and not sending the correct signal to the wiper motor.
- Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of voltage and cause a low voltage reading.
- Wiper motor control module failure: A malfunctioning control module can prevent the mist function from activating correctly.
- Blown fuse: A blown fuse in the circuit can result in a low voltage reading and trigger this diagnostic trouble code.
Symptoms of B2390
- Inoperative mist function: The most obvious symptom of this code is the mist function not working when the switch is activated.
- Erratic wiper behavior: The windshield wipers may operate unpredictably, skipping wipes, or stopping mid-cycle.
- Delayed response: The wipers may have a delayed response when the mist function is activated.
- Wiper blades not returning to the rest position: After using the mist function, the wiper blades may not return to their usual rest position.
How to Fix B2390
- Diagnose the issue: Use a multimeter to test the voltage in the mist switch circuit and identify the source of the low voltage reading.
- Inspect the mist switch: Check the mist switch for any signs of damage or wear and replace it if necessary.
- Check the wiring: Inspect the wiring in the circuit for any damage, corrosion, or loose connections. Repair or replace any faulty wiring.
- Test the wiper motor control module: Check the control module for proper functionality and replace it if it is found to be faulty.
- Reset the code: After making the necessary repairs, clear the diagnostic trouble code from the vehicle's memory using a scan tool to reset the system.
Cost to Fix B2390
The cost of repairing a mist switch circuit low issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $100 to $200. Overall, drivers can expect to pay anywhere from $150 to $400 for this repair at a professional auto repair shop. It is important to note that these estimates are rough averages and actual costs may vary based on the vehicle's make and model, the location of the repair shop, and any additional services required. It is recommended to obtain quotes from multiple repair shops to compare prices and ensure a fair cost for the repair.
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Code B2390 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
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.
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