P0831

What it means

P0831 means the control unit has detected a low voltage or short to ground in the clutch pedal switch A circuit. The signal sits below the expected range, or does not match the pedal position or other inputs. The clutch pedal switch is used for starting permission, cruise control cancellation and sometimes torque management, so the exact functions depend on the vehicle.

Symptoms

• Engine cranks slowly or will not start unless the clutch is pressed (or starts without it)
• Cruise control not working or cancelling unexpectedly
• Warning light on, such as the engine management light
• Hesitation or surge when changing gear on some models
• Stop-start system not working
• Erratic or jerky response when pressing or releasing the clutch

Possible causes

• Faulty or misadjusted clutch pedal switchlikely
• Wiring shorted to ground or chafed in the switch circuitlikely
• Corroded, damaged or loose switch connectorlikely
• Pedal assembly or switch plunger mounting worn, bent or out of positionpossible
• Fault in the supply or reference voltage to the switch from the control unitpossible
• Internal fault in the control unitrare

How to diagnose

1. Read the stored codes and freeze frame data, and note whether other pedal switch or cruise control codes are present
2. Check the live data for the clutch switch status and confirm it changes cleanly when the pedal is pressed and released
3. Visually inspect the switch, its mounting and the pedal for damage, contamination or incorrect adjustment
4. Check the connector for corrosion, bent pins, water ingress and a secure fit, and inspect the wiring along the loom for chafing
5. Measure the switch circuit with a multimeter for a short to ground, comparing against the wiring diagram for the model
6. Check the supply or reference voltage at the connector with the ignition on
7. Test the switch resistance or continuity through its full travel, following the manufacturer's specification
8. Clear the code and road test to see if it returns, after repairs

How to fix

• Replace the clutch pedal switch if it fails the tests
• Adjust or refit the switch to the correct position on the pedal bracket
• Repair or replace damaged wiring and fix any short to ground
• Clean or replace corroded or damaged connectors and terminals
• Repair the pedal assembly or switch mounting if worn or bent
• Diagnose and, if confirmed faulty, repair or replace the control unit as a last resort

Can I keep driving?

Nearby codes

• P0830GenericClutch Pedal Switch A Circuit
• P0832GenericClutch Pedal Switch A Circuit High