AutoCodes – Chevrolet – B2645 2014 Chevrolet Silverado

B2645 2014 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 2014 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 525

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 2014 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 2014 Chevrolet Silverado - Ambient Light Sensor Circuit - AutoCodes.com — B2645 2014 Chevrolet Silverado Code - Ambient Light Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B2645 2014 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 2014 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 2014 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.

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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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B2645 Ambient Light Sensor Circuit in a 2014 Chevrolet Silverado?

- The common symptoms include erratic or non-functioning automatic headlights, inaccurate ambient light readings, and dashboard warning lights related to the ambient light sensor.

2. What are the possible causes of OBDII code B2645 in a 2014 Chevrolet Silverado?

- The code B2645 can be triggered by issues such as a faulty ambient light sensor, damaged wiring or connectors in the sensor circuit, or a malfunction in the ambient light sensor module.

3. How can I diagnose the Ambient Light Sensor Circuit issue in my 2014 Chevrolet Silverado?

- You can diagnose the issue by performing a visual inspection of the sensor and its connections, testing the sensor's functionality using a multimeter, and scanning the vehicle's onboard computer for specific fault codes.

4. Can I repair the Ambient Light Sensor Circuit problem in my Chevrolet Silverado myself?

- Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the ambient light sensor, repairing damaged wiring, or addressing any faulty connectors in the circuit.

5. Is it safe to continue driving my 2014 Chevrolet Silverado with the B2645 code related to the Ambient Light Sensor Circuit?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to ensure proper functioning of automatic lighting systems and to prevent potential safety hazards.

6. How much does it typically cost to repair the Ambient Light Sensor Circuit problem in a 2014 Chevrolet Silverado?

- The cost of repairs can vary depending on the exact cause of the issue, but it may involve expenses for parts such as a new ambient light sensor, as well as potential labor costs if you choose to have a professional mechanic perform the repairs.

7. Can extreme weather conditions affect the performance of the Ambient Light Sensor in a 2014 Chevrolet Silverado?

- Yes, extreme weather conditions such as intense sunlight or heavy rain/snow can impact the performance of the ambient light sensor and potentially contribute to the triggering of the B2645 fault code.

8. Are there any preventive maintenance tips to avoid future occurrences of the B2645 code in my Chevrolet Silverado?

- To prevent future issues with the Ambient Light Sensor Circuit, you can periodically inspect the sensor for damage, keep the sensor clean from dirt and debris, and ensure that the wiring connections are secure and free from corrosion.

9. Will resetting the OBDII codes clear the B2645 Ambient Light Sensor Circuit code in my 2014 Chevrolet Silverado?

- Resetting the OBDII codes may temporarily clear the code, but if the underlying issue with the Ambient Light Sensor Circuit is not addressed, the code is likely to reappear after driving the vehicle for some time.

10. Can a malfunctioning Ambient Light Sensor affect other vehicle systems in a 2014 Chevrolet Silverado?

- While the Ambient Light Sensor primarily affects the automatic lighting system, a malfunctioning sensor can potentially impact other related systems such as the automatic climate control or the vehicle's overall lighting control module.