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B2647 GMC Code - Ambient Light Sensor Circuit

- Code Popularity: 1,951 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B2647 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Ambient Light Sensor
  • Ambient Light Sensor harness is open or shorted
  • Ambient Light Sensor circuit poor electrical connection
  • Faulty Body Control Module (BCM)
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How to Fix the DTC B2647 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2647 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B2647 GMC Description

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. When the BCM senses the ambient light sensor signal voltage is between 1.75-4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON depending upon the amount of light received by the sensor.

OBDII Code B2647 GMC - Ambient Light Sensor Circuit - AutoCodes.com
B2647 GMC Code - Ambient Light Sensor Circuit

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Code B2647 GMC comments

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