AutoCodes – Cadillac – B0188 Cadillac

B0188 Cadillac 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 Cadillac 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 1,001

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

What does this mean?

What are the Possible Causes of the DTC B0188 Cadillac?

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 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 B0188 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.

Need more information about the B0188 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code B0188 in a Cadillac related to the Right Sunload Sensor?

The common symptoms include inaccurate interior temperature readings, malfunctioning automatic climate control, and inconsistent performance of the air conditioning system.

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

The code B0188 in a Cadillac is usually triggered by a faulty Right Sunload Sensor, wiring issues in the sensor circuit, or a malfunction in the HVAC control module.

3. How can I diagnose the Right Sunload Sensor issue causing OBDII code B0188 in my Cadillac?

Diagnosing the issue involves checking the sensor's resistance, inspecting the wiring for any damage, and testing the sensor's functionality using a multimeter or diagnostic scan tool.

4. Can I repair the Right Sunload Sensor issue triggering OBDII code B0188 in my Cadillac myself?

Yes, you can attempt to repair the issue yourself by replacing the faulty Right Sunload Sensor, fixing any damaged wiring, or resetting the HVAC control module to clear the code.

5. Is it safe to continue driving my Cadillac with OBDII code B0188 related to the Right Sunload Sensor?

While the vehicle may still be operable with this code, it is recommended to address the issue promptly to ensure proper functioning of the climate control system and prevent any further damage.

6. How much does it typically cost to repair OBDII code B0188 in a Cadillac caused by the Right Sunload Sensor issue?

The cost of repairing OBDII code B0188 can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor if done at a dealership or repair shop.

7. Will resetting the OBDII code B0188 related to the Right Sunload Sensor make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue with the Right Sunload Sensor is not fixed, the code is likely to reappear after some time.

8. Are there any preventive measures I can take to avoid OBDII code B0188 in my Cadillac?

To prevent OBDII code B0188 related to the Right Sunload Sensor, you can ensure regular maintenance checks on your vehicle's climate control system and promptly address any sensor or wiring issues.

9. Can extreme weather conditions affect the functionality of the Right Sunload Sensor in causing OBDII code B0188?

Yes, extreme temperatures or prolonged exposure to sunlight can potentially impact the accuracy and performance of the Right Sunload Sensor, leading to the triggering of OBDII code B0188.

10. How long does it typically take to repair OBDII code B0188 caused by the Right Sunload Sensor issue in a Cadillac?

The repair time can vary depending on the exact cause of the issue and the expertise of the technician, but in general, it may take anywhere from 1 to 3 hours to diagnose and fix the problem.