AutoCodes – Cadillac – B0189 Cadillac

B0189 Cadillac 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 Cadillac 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 1,169

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

What does this mean?

What are the Possible Causes of the DTC B0189 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

- Common symptoms include inaccurate temperature readings on the climate control system, inconsistent air conditioning performance, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code B0189 Cadillac indicating an issue with the Sunload Sensor 2 Circuit Performance?

- Possible causes can include a faulty sunload sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning climate control module.

3. How can I diagnose the Sunload Sensor 2 Circuit Performance issue related to OBDII code B0189 in a Cadillac?

- Diagnosis involves using a multimeter to test the resistance and voltage readings of the sunload sensor, inspecting the wiring for any damage or corrosion, and scanning the vehicle's computer for codes and data related to the sensor.

4. Can I repair the Sunload Sensor 2 Circuit Performance problem causing OBDII code B0189 in my Cadillac myself?

- While some DIY enthusiasts may be able to replace the sunload sensor or repair wiring issues, it is recommended to consult a professional mechanic for accurate diagnosis and repair to ensure proper functionality.

5. Are there any quick tips to troubleshoot the Sunload Sensor 2 Circuit Performance issue in a Cadillac?

- Quick tips include checking the sensor wiring for visible damage, resetting the vehicle's computer by disconnecting the battery for a few minutes, and ensuring the sensor is clean and free from obstructions.

6. Is it safe to continue driving a Cadillac with OBDII code B0189 related to the Sunload Sensor 2 Circuit Performance issue?

- While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential HVAC system malfunctions and ensure accurate temperature control inside the vehicle.

7. How much does it typically cost to repair the Sunload Sensor 2 Circuit Performance problem causing OBDII code B0189 in a Cadillac?

- Repair costs can vary depending on the specific issue, but they may range from $100 to $300 for parts and labor, with additional costs if any other related components need replacement.

8. Can a faulty sunload sensor impact the overall performance of the Cadillac's air conditioning system?

- Yes, a faulty sunload sensor can impact the air conditioning system's performance by providing incorrect temperature readings, which may result in inadequate cooling or heating inside the vehicle.

9. Will resetting the OBDII code B0189 related to the Sunload Sensor 2 Circuit Performance issue temporarily resolve the problem?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the Sunload Sensor 2 Circuit Performance problem in the Cadillac.

10. How long does it typically take for a mechanic to diagnose and repair the OBDII code B0189 Cadillac issue related to the Sunload Sensor 2 Circuit Performance?

- The diagnosis and repair process can take anywhere from 1 to 3 hours, depending on the complexity of the issue and the availability of replacement parts.