P0724: Brake Switch B Circuit High — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Brake Switch B Circuit High. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- Warning light may illuminate
- Intermittent or implausible live data
- Symptoms vary by vehicle
Possible causes
- A misadjusted brake switch, open or shorted wire, or connector fault can keep the signal in the wrong state.
- Wiring or connector fault
- Vehicle-specific operating condition
What to check
- Save codes and freeze-frame information
- Verify brake lamps and both switch inputs change correctly as the pedal is pressed and released; test the circuit before replacing the switch.
- Compare live data with vehicle specifications
- Confirm the repair under the conditions that set the code
- Verify brake lamps and both switch inputs change correctly as the pedal is pressed and released; test the circuit before replacing the switch.
- Repair the confirmed cause and verify the result
Also written as: P0724-00, P072400, PO724 (some scan tools add the fault-type byte, e.g. -00).