AutoCodes – Chevrolet – B370A Chevrolet

B370A Chevrolet Code - Rain Sensor Internal Malfunction

Quick Answer

B+ and ground is supplied at all times to the rain sensor. Common causes include Faulty Windshield Outside Moisture Sensor (Rain Sensor), Windshield Outside Moisture Sensor harness is open or shorted, Windshield Outside Moisture Sensor 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: B370A Chevrolet indicates Rain Sensor Internal Malfunction.
Common causes: Common causes include Faulty Windshield Outside Moisture Sensor (Rain Sensor), Windshield Outside Moisture Sensor harness is open or shorted, Windshield Outside Moisture Sensor 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 6,240

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 Mar 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B370A Chevrolet Description

B+ and ground is supplied at all times to the rain sensor. The rain sensor communicates with the Body Control Module (BCM) via serial data. When the ignition is in the ON or ACCESSORY position and the windshield wiper/washer switch is in the intermittent delay position, the BCM monitors the rain sensor to determine the rain build up on the windshield. As rain builds up on the windshield, the BCM will command the wipers to activate. The sensitivity of the wiper frequency is controlled by the intermittent delay of the windshield wiper/washer switch. As the sensitivity is increased, the BCM will command more frequent wiper activation based on rain build up on the windshield.
The system supports the rain sensor On/Off button. The AUTO switch is located on the turn signal/multifunction switch. Press the auto button to turn the rain sensor On/Off. When rain sensor is turned on and the rain sensor wipe sensitivity positions is adjusted by the front delay switch. The wipers can be adjusted for more or less sensitivity to moisture. When rain sensor turned off, the wipers operate as timed intermittent wipers and can be adjusted for more or less frequent wipes.
If the ignition is in ON/RUN and the front band is in one of the sensitivity settings when auto is turned on or off, a message may display indicating if rain sensor was turned on or off.
If the ignition is in ON/RUN and the front band is not in one of the sensitivity settings when auto is turned on, a message may display indicating that the wiper band must be in one of the sensitivity settings for rain sensor to operate.
The Diagnostic Trouble Code (DTC) sets when communication between the BCM and the rain sensor is interrupted, and an interruption in communication is a serial data fault.

OBDII Code B370A Chevrolet - Rain Sensor Internal Malfunction - AutoCodes.com — B370A Chevrolet Code - Rain Sensor Internal Malfunction

What does this mean?

What are the Possible Causes of the DTC B370A Chevrolet?

Faulty Windshield Outside Moisture Sensor (Rain Sensor)
Windshield Outside Moisture Sensor harness is open or shorted
Windshield Outside Moisture Sensor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B370A Chevrolet?

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 B370A Chevrolet 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 B370A Chevrolet Code

1. What are the common symptoms of OBDII code B370A (Chevrolet) indicating a Rain Sensor Internal Malfunction?

The common symptoms include erratic windshield wiper operation, failure of the automatic rain-sensing feature, and possibly an illuminated warning light on the dashboard.

2. What can cause the Rain Sensor Internal Malfunction code B370A in a Chevrolet?

The code B370A may be triggered by a faulty rain sensor module, damaged wiring or connectors related to the rain sensor, or a malfunction within the sensor itself.

3. How can I diagnose the Rain Sensor Internal Malfunction in my Chevrolet when OBDII code B370A is present?

A thorough inspection of the rain sensor system, including checking the wiring, connectors, and sensor functionality, is recommended. Testing the rain sensor module and confirming proper power supply is essential.

4. Is it safe to drive with the Rain Sensor Internal Malfunction code B370A illuminated on my Chevrolet's dashboard?

While the vehicle is still safe to drive, the automatic rain-sensing feature may not work properly, leading to reduced visibility in rainy conditions. It is advisable to address the issue promptly.

5. Can I repair the Rain Sensor Internal Malfunction code B370A in my Chevrolet on my own?

If you have experience with automotive electrical systems and the necessary tools, you may be able to troubleshoot and repair the issue. However, seeking assistance from a qualified mechanic or dealership is recommended for accurate diagnosis and repair.

6. Are there any temporary solutions to consider if I encounter the Rain Sensor Internal Malfunction code B370A while driving?

If the rain sensor malfunctions while driving, you can manually adjust the windshield wiper settings to maintain visibility. However, it is important to address the underlying issue as soon as possible.

7. Will resetting the OBDII system clear the Rain Sensor Internal Malfunction code B370A in my Chevrolet?

Resetting the OBDII system may temporarily clear the code, but if the root cause of the rain sensor malfunction is not addressed, the code is likely to reappear. It is best to diagnose and resolve the issue to prevent future occurrences.

8. How much does it typically cost to repair the Rain Sensor Internal Malfunction code B370A in a Chevrolet?

The cost of repair can vary depending on the exact cause of the issue and whether any components need to be replaced. It is advisable to obtain a professional diagnosis to determine the cost accurately.

9. Can extreme weather conditions affect the triggering of the Rain Sensor Internal Malfunction code B370A in a Chevrolet?

Yes, extreme weather conditions such as heavy rain, snow, or intense sunlight can sometimes affect the proper functioning of the rain sensor, potentially leading to the code B370A being triggered.

10. Is the Rain Sensor Internal Malfunction code B370A specific to certain Chevrolet models or is it a common issue across different models?

The B370A code related to Rain Sensor Internal Malfunction is specific to Chevrolet vehicles equipped with rain-sensing wipers and may not be applicable to all models. It is more commonly found in newer Chevrolet vehicles with advanced sensor technology.