AutoCodes – Chevrolet – B2645 Chevrolet

B2645 Chevrolet Code - Ambient Light Sensor Circuit

Quick Answer

The ambient light sensor is used to monitor outside lighting conditions. Common causes include Faulty Ambient Light/Sunload Sensor, Ambient Light/Sunload Sensor harness is open or shorted, Ambient Light/Sunload Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2645 Chevrolet indicates Ambient Light Sensor Circuit.
Common causes: Common causes include Faulty Ambient Light/Sunload Sensor, Ambient Light/Sunload Sensor harness is open or shorted, Ambient Light/Sunload Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,113

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 29, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B2645 Chevrolet Description

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 V depending on outside lighting conditions. The Body Control Module (BCM) provides a 5 V reference signal to the ambient light sensor and the Heating, Ventilation, and Air Conditioning (HVAC) control module provides a low reference ground. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either Daytime Running Lights (DRL) or automatic lamp control when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the daytime running lamps ON. During low light conditions, the BCM will command the low beam headlamps ON. Any function or condition that turns on the headlamps will cancel daytime running lamps operation.

OBDII Code B2645 Chevrolet - Ambient Light Sensor Circuit - AutoCodes.com — B2645 Chevrolet Code - Ambient Light Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B2645 Chevrolet?

Faulty Ambient Light/Sunload Sensor
Ambient Light/Sunload Sensor harness is open or shorted
Ambient Light/Sunload Sensor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2645 Chevrolet?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2645 Chevrolet 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 B2645 Chevrolet code?

Need more information on how to fix the B2645 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Chevrolet Models

B2645 2014 Chevrolet Silverado — Ambient Light Sensor Circuit
B2645 2015 Chevrolet Silverado — Ambient Light Sensor Circuit
B2645 2016 Chevrolet Silverado — Ambient Light Sensor Circuit
B2645 2017 Chevrolet Silverado — Ambient Light Sensor Circuit
B2645 2018 Chevrolet Silverado — Ambient Light Sensor Circuit

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 B2645 Chevrolet Code

1. What are the common symptoms of OBDII code B2645 in a Chevrolet related to the Ambient Light Sensor Circuit?

The common symptoms include inconsistent automatic headlight operation, erratic behavior of interior lighting, and potential malfunction of the automatic climate control system.

2. What can cause the OBDII code B2645 related to the Ambient Light Sensor Circuit in a Chevrolet?

Possible causes of this code include a faulty ambient light sensor, damaged wiring or connectors in the sensor circuit, or a malfunction in the body control module.

3. How can I diagnose the OBDII code B2645 in my Chevrolet related to the Ambient Light Sensor Circuit?

Diagnosis involves checking the ambient light sensor for proper operation, inspecting the wiring and connectors for any damage, and using a diagnostic scan tool to retrieve and interpret the trouble codes stored in the vehicle's computer.

4. Can I repair the OBDII code B2645 related to the Ambient Light Sensor Circuit in my Chevrolet on my own?

Depending on your automotive repair skills and experience, you may be able to address this issue on your own by replacing the ambient light sensor, repairing damaged wiring or connectors, or resetting the body control module.

5. Are there any tips for repairing the OBDII code B2645 Ambient Light Sensor Circuit issue in a Chevrolet?

It is recommended to carefully inspect the ambient light sensor and surrounding wiring for any visible damage before proceeding with any repairs. Additionally, consulting the vehicle's service manual or seeking professional assistance may be beneficial.

6. How critical is it to address the OBDII code B2645 related to the Ambient Light Sensor Circuit in a Chevrolet promptly?

While the issue may not directly affect the drivability of the vehicle, it is essential to address this code promptly to restore proper functioning of the ambient light sensor and ensure the correct operation of related systems.

7. Can the OBDII code B2645 in a Chevrolet related to the Ambient Light Sensor Circuit trigger the check engine light?

Yes, the OBDII code B2645 can trigger the check engine light or other warning lights on the vehicle's dashboard, indicating a potential issue with the ambient light sensor circuit.

8. Will resetting the OBDII code B2645 in a Chevrolet related to the Ambient Light Sensor Circuit temporarily resolve the issue?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing the code to appear. It is important to diagnose and address the root cause of the issue to prevent it from reoccurring.

9. Is it safe to continue driving my Chevrolet with the OBDII code B2645 related to the Ambient Light Sensor Circuit present?

While it may be safe to drive the vehicle with this code present, it is recommended to address the issue promptly to ensure the proper functioning of the ambient light sensor and related systems for optimal driving experience.

10. Can extreme weather conditions affect the performance of the ambient light sensor triggering the OBDII code B2645 in a Chevrolet?

Yes, extreme weather conditions such as intense sunlight or heavy rain may impact the performance of the ambient light sensor, potentially leading to the triggering of the OBDII code B2645 related to the Ambient Light Sensor Circuit.