Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
DTC indicates that headlights were not on when Automatic Lighting Control (ALC) relay output was on. DTC B2575 will set when the ALC headlight relay output is active, ALC option is enabled and ignition 1 is active, high beams are either off or in Daytime Running Light (DRL) mode and low beams are off for 5 seconds. When DTC sets, SERVICE VEHICLE SOON indicator will come on and check gauges chime will sound. DTC will clear if BCM reads proper headlight voltage or senses that conditions for DTC are no longer present. DTC will clear from history after ignition switch is cycled on and off 100 times with no faults present. DTC can also be cleared using scan tool.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.