P0724
Brake Switch B Circuit High
Brake Switch B Circuit High: the signal voltage is above the expected range. Often an open circuit or a short to supply voltage.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Brake switch defectiveCommon
- Wiring openPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Brake Switch
- Switch Wiring
P0724 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.