AutoCodes – Buick – B0189 Buick

B0189 Buick Code - Sunload Sensor 2 Circuit Performance

Quick Answer

The sunload sensor is a 2-wire photo diode. Common causes include Faulty Sunload Sensor 2, Sunload Sensor 2 harness is open or shorted, Sunload Sensor 2 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: B0189 Buick indicates Sunload Sensor 2 Circuit Performance.
Common causes: Common causes include Faulty Sunload Sensor 2, Sunload Sensor 2 harness is open or shorted, Sunload Sensor 2 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 988

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 B0189 Buick Description

The sunload sensor is a 2-wire photo diode. The vehicle uses left and right sunload sensors. The two sensors are integrated into the sunload sensor assembly along with the ambient light sensor. Low reference and signal circuits enable the sensor to operate. As the sunload increases, the sensor signal decreases. The sensor operates within an intensity range between completely dark and bright. The sensor signal varies between 0-5 volts. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module converts the signal to a range between 0-255 counts. The sunload sensor provides the HVAC control module a measurement of the amount of light shining on the vehicle. Bright or high intensity, light causes the vehicles inside temperature to increase. The HVAC system compensates for the increased temperature by diverting additional cool air into the vehicle.

OBDII Code B0189 Buick - Sunload Sensor 2 Circuit Performance - AutoCodes.com — B0189 Buick Code - Sunload Sensor 2 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC B0189 Buick?

Faulty Sunload Sensor 2
Sunload Sensor 2 harness is open or shorted
Sunload Sensor 2 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0189 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 B0189 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.

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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 B0189 Buick Code

1. What are the common symptoms of OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

- Common symptoms may include incorrect HVAC system operation, poor air conditioning performance, or automatic climate control issues.

2. What causes the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

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

3. How can I diagnose the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

- Diagnosis typically involves checking the wiring connections, inspecting the sensor for damage, and testing the sensor's functionality using a multimeter.

4. Can I drive my Buick with the OBDII code B0189 related to the Sunload Sensor 2 Circuit Performance?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential comfort and performance issues.

5. How do I repair the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

- Repair may involve replacing the sunload sensor, repairing damaged wiring, or resetting the sensor circuit as needed.

6. Are there any DIY tips for fixing the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

- DIY enthusiasts can attempt to inspect the sensor and wiring for visible damage, but for accurate diagnosis and repair, it is recommended to consult a professional technician.

7. Can weather conditions affect the triggering of the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance?

- Extreme weather conditions, such as prolonged exposure to direct sunlight or moisture, can potentially impact the sensor's performance and trigger the code.

8. Is the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance a common issue in Buick vehicles?

- While not as common as other OBDII codes, issues related to the sunload sensor circuit can occur in Buick vehicles, particularly in older models or those exposed to harsh conditions.

9. Will resetting the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue with the sunload sensor circuit is not resolved, the code is likely to reappear.

10. How much does it typically cost to repair the OBDII code B0189 Buick related to the Sunload Sensor 2 Circuit Performance at a mechanic or dealership?

- The cost of repair can vary depending on the extent of the issue, but it may range from $100 to $300, including parts and labor.