AutoCodes – Buick – B0188 Buick

B0188 Buick 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 Buick 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 944

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

What does this mean?

What are the Possible Causes of the DTC B0188 Buick?

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 Buick?

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 Buick 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 Buick code?

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Need Help with the 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 B0188 Buick Code

1. What are the common symptoms of OBDII code B0188 in a Buick related to the right sunload sensor?

- Common symptoms include improper air conditioning operation, erratic temperature readings, or the AC system failing to cool the interior properly.

2. What can cause the OBDII code B0188 to trigger in a Buick's right sunload sensor?

- The code B0188 can be triggered by a faulty right sunload sensor, damaged wiring, or a poor connection in the sensor circuit.

3. How can I diagnose the OBDII code B0188 in a Buick's right sunload sensor?

- Diagnosing code B0188 involves checking the sensor's wiring for damage, ensuring the sensor is receiving power, and using a multimeter to test the sensor's resistance.

4. Can I reset the OBDII code B0188 in my Buick's right sunload sensor without fixing the issue?

- Resetting the code without addressing the underlying problem will likely result in it reoccurring once the issue persists, so it's best to diagnose and repair the root cause.

5. Are there any DIY repair tips for fixing the OBDII code B0188 related to the right sunload sensor in a Buick?

- DIY repair tips include checking and securing the sensor's wiring connections, inspecting for any physical damage to the sensor, and replacing the sensor if necessary.

6. What is the function of the right sunload sensor in a Buick that triggers OBDII code B0188?

- The right sunload sensor measures the amount of sunlight entering the vehicle and helps the climate control system adjust the temperature and airflow accordingly.

7. Is it safe to continue driving my Buick with the OBDII code B0188 related to the right sunload sensor?

- While the vehicle may still be driveable with this code, it's essential to address the issue promptly to ensure proper functioning of the climate control system.

8. How much does it typically cost to repair the OBDII code B0188 in a Buick's right sunload sensor?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the sensor, fixing wiring problems, or addressing other related issues.

9. Can extreme weather conditions affect the performance of the right sunload sensor in a Buick and trigger code B0188?

- Yes, extreme heat or prolonged exposure to sunlight can sometimes affect the sensor's performance, leading to the triggering of code B0188.

10. Will fixing the OBDII code B0188 related to the right sunload sensor improve the overall comfort and efficiency of the climate control system in my Buick?

- Yes, resolving this code will help ensure that the climate control system functions properly, leading to improved comfort and efficiency while driving.