ALC Relay Control Circuit Is Open/Shorted To Ground
Table of contents
B2577 PONTIAC Possible 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)
How do I fix code B2577 PONTIAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B2577 PONTIAC code
The cost of diagnosing the B2577 PONTIAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B2577 PONTIAC 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.