P0831 Clutch Pedal Switch A Circuit Low

P0831 indicates clutch pedal switch A circuit low. The switch A signal is lower than expected or stuck in a low-voltage state.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the starter or clutch parts before checking the low switch signal electrically.

Symptoms of P0831

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0831

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Measure switch A signal voltage, feed, ground, and continuity while the clutch pedal moves through its full travel.
Inspect switch adjustment, connector terminals, pedal harness flex points, blown fuses, and short-to-ground conditions.
Compare clutch switch A and B data if both are present to determine whether the low signal is isolated or shared.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.