AutoCodes – Chevrolet – B2645 2017 Chevrolet Silverado

B2645 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 164

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado - Ambient Light Sensor Circuit - AutoCodes.com — B2645 2017 Chevrolet Silverado Code - Ambient Light Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B2645 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 B2645 2017 Chevrolet Silverado Code

1. What does OBDII code B2645 on a 2017 Chevrolet Silverado indicate?

The OBDII code B2645 for a 2017 Chevrolet Silverado relates to an issue with the Ambient Light Sensor Circuit.

2. What are the common symptoms of a B2645 OBDII code in a 2017 Chevrolet Silverado?

Common symptoms of OBDII code B2645 in a 2017 Chevrolet Silverado may include inaccurate ambient light readings on the vehicle's display, automatic headlight control malfunctions, or warning lights on the dashboard.

3. What are some possible causes of the B2645 OBDII code in a 2017 Chevrolet Silverado?

Possible causes of OBDII code B2645 in a 2017 Chevrolet Silverado include a faulty ambient light sensor, damaged wiring or connectors in the ambient light sensor circuit, or a malfunctioning control module.

4. How can I diagnose the B2645 OBDII code in my 2017 Chevrolet Silverado?

Diagnosing the B2645 OBDII code in a 2017 Chevrolet Silverado typically involves checking the ambient light sensor for proper operation, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to retrieve and interpret the trouble codes.

5. Can I repair the B2645 OBDII code in my 2017 Chevrolet Silverado on my own?

Depending on your automotive repair skills, you may be able to address the B2645 OBDII code in your 2017 Chevrolet Silverado by replacing the ambient light sensor, repairing any wiring issues, or resetting the control module. However, if you are unsure, it's recommended to seek assistance from a professional mechanic.

6. Will driving with the B2645 OBDII code illuminated harm my 2017 Chevrolet Silverado?

While driving with the B2645 OBDII code illuminated may not directly harm your 2017 Chevrolet Silverado, it is important to address the underlying issue promptly to prevent potential safety hazards or further damage to the vehicle's systems.

7. How much does it cost to repair the B2645 OBDII code in a 2017 Chevrolet Silverado?

The cost of repairing the B2645 OBDII code in a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue, the parts needed for repair, and the labor rates of the mechanic. It's advisable to obtain quotes from different repair shops for an accurate estimate.

8. Can extreme weather conditions affect the ambient light sensor circuit and trigger the B2645 OBDII code in a 2017 Chevrolet Silverado?

Extreme weather conditions such as intense sunlight or heavy rain may impact the performance of the ambient light sensor circuit in a 2017 Chevrolet Silverado, potentially leading to the triggering of the B2645 OBDII code. Regular maintenance and inspection can help prevent such issues.

9. Is the B2645 OBDII code a common problem in 2017 Chevrolet Silverado vehicles?

The B2645 OBDII code related to the Ambient Light Sensor Circuit is not one of the most common issues reported in 2017 Chevrolet Silverado vehicles. However, it can still occur due to various factors affecting the sensor or its circuitry.

10. How long does it typically take to repair the B2645 OBDII code in a 2017 Chevrolet Silverado?

The repair time for the B2645 OBDII code in a 2017 Chevrolet Silverado can vary based on the exact cause of the issue, the availability of parts, and the expertise of the mechanic. In general, it may take a few hours to a full day to diagnose and repair the problem.