Clutch pedal switch 'A' internally shorted to ground or stuck in the closed position.; Damaged or chafed wiring between the switch and the PCM, shorting the signal wire to ground.; Loose, corroded, or disconnected electrical connector at the clutch pedal switch.; Misadjusted or improperly installed switch that keeps the circuit grounded regardless of pedal position.; Faulty PCM or a poor ground reference shared with the switch circuit, though this is less common.; Aftermarket floor mats, pedal covers, or linkage wear that prevents the pedal from fully releasing the switch.

DTC codes / P08xx · Transmission / P0831

P0831Clutch Pedal Switch 'A' Circuit Low

Q: What does code P0831 mean?

Clutch Pedal Switch 'A' Circuit Low. P0831 means the powertrain control module (PCM) sees the clutch pedal switch 'A' circuit voltage staying low when it should be switching between high and low states as the pedal moves. The PCM interprets this continuous low signal as a short to ground, an open circuit, or a switch that is stuck closed, and it sets the code because it cannot reliably determine clutch pedal position.

P0831 means the powertrain control module (PCM) sees the clutch pedal switch 'A' circuit voltage staying low when it should be switching between high and low states as the pedal moves. The PCM interprets this continuous low signal as a short to ground, an open circuit, or a switch that is stuck closed, and it sets the code because it cannot reliably determine clutch pedal position.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

The check engine light or a clutch-related warning lamp illuminates on the dashboard.
The engine may not crank or start because the PCM does not see the clutch pedal depressed.
Cruise control may be inoperative or may disengage unexpectedly when the clutch is pressed.
The engine may stall or hesitate during gear changes if the PCM uses the signal for fuel and torque management.
Often no symptoms besides the warning light, especially on vehicles that do not use the switch for starting or cruise control.

Common causes, most likely first

Clutch pedal switch 'A' internally shorted to ground or stuck in the closed position.
Damaged or chafed wiring between the switch and the PCM, shorting the signal wire to ground.
Loose, corroded, or disconnected electrical connector at the clutch pedal switch.
Misadjusted or improperly installed switch that keeps the circuit grounded regardless of pedal position.
Faulty PCM or a poor ground reference shared with the switch circuit, though this is less common.
Aftermarket floor mats, pedal covers, or linkage wear that prevents the pedal from fully releasing the switch.

How to diagnose and fix it

Inspect the clutch pedal switch and connector for physical damage, corrosion, or looseness, and verify the switch is properly seated against the pedal arm.
Check the switch adjustment by confirming the circuit changes state (high to low) as the pedal is pressed and released, using a scan tool or multimeter.
Disconnect the switch and measure resistance across its terminals in both pedal positions to confirm it opens and closes correctly.
Backprobe the signal wire at the PCM and check for a short to ground with the switch disconnected; repair any chafed or pinched wiring.
Verify the ground circuit for the switch has less than one ohm of resistance to the battery negative terminal.
Replace the clutch pedal switch 'A' if it fails the resistance and state-change tests, then clear the code and confirm it does not return.
If all wiring and the switch test good, check for a faulty PCM or shared ground issue before condemning the module.

Clutch switch codes that fool good technicians

A clutch pedal switch can test fine with a multimeter but still set P0831 intermittently because the pedal arm does not fully release the switch plunger due to a worn bushing or a thick floor mat.
Many vehicles use two or three clutch switches for different functions, and P0831 refers specifically to switch 'A'; replacing the wrong switch is a common and expensive misdiagnosis.
The PCM may set P0831 only after a drive cycle that includes cruise control engagement or a specific number of clutch presses, so the code can appear long after the actual fault begins.
A shorted switch can back-feed the cruise control module or the starter relay circuit, causing symptoms that seem unrelated to the clutch pedal.
On some vehicles the clutch switch shares a ground with the brake pedal switch, so a bad brake switch or its wiring can trigger P0831 as a secondary code.

Can I keep driving with P0831?

You can usually drive the vehicle, but avoid relying on cruise control and be prepared for a no-crank condition if the switch fails completely. If the engine will not start or stalls during gear changes, stop driving and repair the circuit before continuing.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.