P0572: Brake Switch A Circuit Low — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Brake Switch A Circuit Low. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- The brake lights may not illuminate when the brake pedal is pressed.
- Cruise control or the gear-selector interlock may also operate incorrectly.
Possible causes
- Brake switch A may be worn, damaged or incorrectly adjusted.
- Damaged wiring, corroded connectors or a faulty circuit fuse can lower the switch signal.
What to check
- Confirm P0572 and visually verify the brake-light operation before road use.
- Check switch position, its connector, the related fuse and accessible wiring.
- Compare the switch input and electrical voltage in both pedal positions to vehicle specifications before replacing parts.
Also written as: P0572-00, P057200, PO572 (some scan tools add the fault-type byte, e.g. -00).