P0831
Clutch Pedal Switch A Circuit Low
Clutch pedal switch A input reads stuck low — short to ground or stuck-closed contact. The ECM may treat clutch as constantly disengaged, blocking cruise control or affecting cranking permission on manual transmissions.
- 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.
- Switch wire shorted to groundCommon
- Connector pins corroded - high contact resistanceLess likely
- Harness chafing through insulationLess likely
Parts involved
- Clutch Pedal Switch A
P0831 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.