P0831
Clutch Pedal Switch A Circuit Low
Transmission / clutch controls
Generic OBD-II
Medium
What it means
P0831 sets when the module sees a low-voltage (or shorted) signal from clutch pedal switch "A" on a manual-transmission car. That switch tells the car whether the clutch is pressed — it's used for the clutch-start interlock and cruise control. The engine still runs and drives normally, but on cars that require the clutch pressed to crank you may have starting trouble.
Medium
Can I keep driving? The engine runs and drives normally, but on cars with a clutch-start interlock you may have trouble cranking, and cruise control may not work.
Common symptoms
What you'll notice
- Check-engine light on
- Hard to start or engine won't crank on cars that require the clutch pressed to start
- Engine may crank without the clutch pedal pressed (interlock defeated)
- Cruise control won't engage or drops out
Common causes
Most likely first
- Faulty clutch pedal position switchLikely
- Corroded, shorted, or damaged wiring in the switch circuitCommon
- Loose or disconnected connector at the switchCommon
- Misadjusted switch or pedal bracketLess often
- Failed control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code, then locate the clutch pedal switch at the pedal bracket.
- Inspect the connector and wiring for corrosion, chafing, or a short to ground.
- Check switch adjustment and test its operation with the pedal up and down (continuity).
- Replace the clutch pedal switch if it fails the test.
- Repair wiring faults, then clear the code and re-test starting and cruise control.
FAQ
Quick answers
Is it safe to drive with P0831?+
Yes — the engine runs and drives normally. The main nuisance is a hard start on cars that require the clutch pressed to crank, and cruise control that won't engage.
Can I just clear P0831?+
You can, but it returns until the switch or its wiring is fixed. If your car uses a clutch-start interlock, a bad switch can leave you unable to start.
Related codes
Often seen with P0831
Read & clear P0831 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX