B2647 Code - Ambient Light Sensor Circuit
Quick Answer
The Body Control Module (BCM) monitors the Ambient Light Sensor signal circuit in order to determine if the Daytime Running Lights (DRL) or the Auto Headlights (ALC) should be turned ON in the AUTO mode. Common causes include Faulty Ambient Light Sensor, Ambient Light Sensor harness is open or shorted, Ambient Light 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
- B2647 indicates Ambient Light Sensor Circuit.
- Common causes
- Common causes include Faulty Ambient Light Sensor, Ambient Light Sensor harness is open or shorted, Ambient Light 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.
Code B2647 Description
What are the Possible Causes of the DTC B2647?
- Faulty Ambient Light Sensor
- Ambient Light Sensor harness is open or shorted
- Ambient Light Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B2647?
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 B2647 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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Information for Specific Makes
- B2647 Buick — Ambient Light Sensor Circuit
- B2647 Cadillac — Ambient Light Sensor Circuit
- B2647 Chevrolet — Ambient Light Sensor Circuit
- B2647 GMC — Ambient Light Sensor Circuit
- B2647 Infiniti — Electric Compressor Motor Current Limit
- B2647 Nissan — Electric Compressor Motor Current Limit
Frequently Asked Questions about B2647 Code
1. What are the common symptoms of OBDII code B2647 Ambient Light Sensor Circuit?
- Common symptoms include malfunctioning automatic headlights, erratic interior lighting, and inaccurate ambient light readings on the dashboard.
2. What are the main causes of OBDII code B2647 Ambient Light Sensor Circuit?
- The main causes can be a faulty ambient light sensor, damaged wiring or connectors in the sensor circuit, or issues with the body control module.
3. How can I diagnose the Ambient Light Sensor Circuit issue related to OBDII code B2647?
- To diagnose the issue, you can use a multimeter to test the ambient light sensor's resistance, check the sensor's wiring and connectors for damage, and perform a scan tool analysis for any related codes.
4. Can a malfunctioning ambient light sensor affect other vehicle systems?
- Yes, a malfunctioning ambient light sensor can affect the automatic headlight system, interior lighting controls, and potentially impact other systems that rely on ambient light data for operation.
5. How can I repair OBDII code B2647 related to the Ambient Light Sensor Circuit?
- Repair options include replacing the ambient light sensor, repairing or replacing damaged wiring and connectors, resetting the fault codes using a scan tool, and ensuring the body control module is functioning correctly.
6. Are there any DIY tips for troubleshooting OBDII code B2647 Ambient Light Sensor Circuit?
- DIY tips include checking the ambient light sensor for dirt or obstruction, inspecting the sensor's mounting location for any issues, and ensuring the sensor is receiving proper voltage and ground.
7. Can a temporary glitch cause OBDII code B2647 to trigger?
- Yes, a temporary glitch or environmental factors like extreme sunlight exposure or moisture can sometimes trigger the code, so it's recommended to clear the code and monitor the system before proceeding with repairs.
8. Is it safe to continue driving with OBDII code B2647 related to the Ambient Light Sensor Circuit?
- In most cases, it is safe to continue driving, but it's important to address the issue promptly to avoid potential issues with automatic lighting controls and other related systems.
9. Can extreme weather conditions affect the performance of the ambient light sensor?
- Yes, extreme weather conditions such as heavy rain, snow, or intense sunlight can sometimes affect the ambient light sensor's performance and lead to OBDII code B2647 being triggered.
10. How long does it typically take to repair OBDII code B2647 Ambient Light Sensor Circuit?
- The repair time can vary depending on the exact cause of the issue, but it usually takes around 1-2 hours for diagnosis and repair by a professional mechanic.
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