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B2577 GMC Code - ALC Relay Control Circuit Is Open/Shorted To Ground

- Code Popularity: 393 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B2577 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 Automatic Lighting Control (ALC) Relay
  • Automatic Lighting Control (ALC) Relay harness is open or shorted
  • Automatic Lighting Control (ALC) Relay circuit poor electrical connection
  • Faulty Body Control Module (BCM)
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How to Fix the DTC B2577 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 B2577 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 B2577 GMC Description

The Body Control Module (BCM) turns on the Automatic Lighting Control (ALC) Relay when the ambient light sensor senses a dark condition. Battery positive voltage is supplied to the ALC relay at all times through the LH HDLP fuse. The BCM grounds the ALC relay control circuit in order to activate the relay.

OBDII Code B2577 GMC - ALC Relay Control Circuit Is Open/Shorted To Ground - AutoCodes.com
B2577 GMC Code - ALC Relay Control Circuit Is Open/Shorted To Ground

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