AutoCodes – Generic – B0188

B0188 Code - Right Sunload Sensor

Quick Answer

The left and right sunload sensors provide the Heating, Ventilation, and Air Conditioning (HVAC) Control Module with inputs as to the amount heat load the sun is placing on the interior of the vehicle. Common causes include Faulty Right Sunload Sensor, Right Sunload Sensor harness is open or shorted, Right Sunload Sensor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0188 indicates Right Sunload Sensor.
Common causes: Common causes include Faulty Right Sunload Sensor, Right Sunload Sensor harness is open or shorted, Right Sunload Sensor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,128

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0188 Description

The left and right sunload sensors provide the Heating, Ventilation, and Air Conditioning (HVAC) Control Module with inputs as to the amount heat load the sun is placing on the interior of the vehicle. The sunload sensors are photodiodes that are sensitive to light intensity. The Body Control Module (BCM) applies 5 volts to internal input resistors that are connected to the left and right signal circuits of the sunload sensor assembly. The BCM provides ground to the sensors through the low reference circuit. The BCM monitors the voltage drops across the sunload sensors and converts the voltage values to count values where 1 V is approximately equal to 51 counts. As the light intensity increases, the sunload sensors allow more current to travel through the circuits and the signal voltages decrease. As the light intensity decreases, the sunload sensors allow less current to travel through the circuits and the signal voltages increase. The BCM transmits the data to the HVAC control module over the class 2 serial data circuit.

OBDII Code B0188 - Right Sunload Sensor - AutoCodes.com — B0188 Code - Right Sunload Sensor

What does this mean?

What are the Possible Causes of the DTC B0188?

Faulty Right Sunload Sensor
Right Sunload Sensor harness is open or shorted
Right Sunload Sensor circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0188?

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 B0188 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 B0188 code?

Need more information on how to fix the B0188 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0188 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0188 Buick — Right Sunload Sensor
B0188 Cadillac — Right Sunload Sensor
B0188 Chevrolet — Right Sunload Sensor
B0188 GMC — Right Sunload Sensor

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 B0188 Code

1. What are the common symptoms of OBDII code B0188 (Right Sunload Sensor)?

- The common symptoms include inaccurate readings from the right sunload sensor, leading to issues with automatic climate control and air conditioning.

2. What are the possible causes of OBDII code B0188?

- The code B0188 is typically triggered by a faulty right sunload sensor, wiring issues, or a malfunction in the sensor circuit.

3. How can I diagnose the right sunload sensor to confirm it is the cause of OBDII code B0188?

- To diagnose the right sunload sensor, you can use a multimeter to test the sensor's resistance and voltage output, or consult a professional mechanic for a comprehensive diagnosis.

4. Can I repair the right sunload sensor myself to fix OBDII code B0188?

- If you have experience with automotive repairs and diagnostics, you may be able to replace the right sunload sensor yourself. However, it is recommended to consult a professional for accurate diagnosis and repair.

5. Are there any quick tips to troubleshoot OBDII code B0188 before seeking professional help?

- You can start by checking the wiring connections to the right sunload sensor for any visible damage, ensuring the sensor is clean and unobstructed, and resetting the OBDII codes to see if the issue persists.

6. Is it safe to continue driving with OBDII code B0188 (Right Sunload Sensor) unresolved?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential issues with the automatic climate control system and air conditioning.

7. How much does it typically cost to repair OBDII code B0188 related to the right sunload sensor?

- The cost of repairing OBDII code B0188 can vary depending on the root cause of the issue, but it may involve replacing the right sunload sensor, which can range from $100 to $300 including parts and labor.

8. Can extreme weather conditions impact the performance of the right sunload sensor and trigger OBDII code B0188?

- Yes, extreme heat or cold can affect the performance of the right sunload sensor, leading to inaccurate readings and triggering OBDII code B0188.

9. Will resetting the OBDII codes make OBDII code B0188 (Right Sunload Sensor) disappear permanently?

- Resetting the OBDII codes may temporarily clear the code, but if the underlying issue with the right sunload sensor persists, the code is likely to reappear.

10. Is the right sunload sensor a critical component for the proper functioning of the vehicle's climate control system?

- Yes, the right sunload sensor plays a crucial role in regulating the interior temperature of the vehicle, especially for automatic climate control systems, and its proper functioning is essential for optimal comfort and performance.