What Does P0831 Mean?
The clutch pedal switch "A" circuit is reading low voltage. This typically means the switch is stuck in the closed/grounded position, there is a short to ground in the wiring, or the switch is misadjusted and constantly depressed. The PCM may think the clutch is always pressed, which can affect starting logic and transmission control.
Common Causes
35%
Clutch pedal switch "A" stuck closed or misadjusted — always grounded
25%
Short to ground in the clutch switch signal wire
20%
Defective clutch switch with internal short
10%
Connector corrosion causing low-resistance ground path
10%
PCM internal pull-down or input circuit failure
Diagnostic Steps
1
Monitor clutch switch A status in live data — if it shows "pressed" even when the pedal is fully released, the switch or wiring is at fault.
2
Inspect the clutch pedal switch for proper adjustment — ensure it releases (opens) when the clutch pedal is not pressed.
3
Disconnect the clutch switch connector and check if the voltage at the PCM input changes — this isolates the switch from the wiring.
4
If the fault clears with the switch disconnected, replace or readjust the clutch pedal switch.
5
If the low voltage persists with the switch disconnected, check the signal wire for a short to ground.
Estimated Repair Cost
$20 - $150
Parts + labor, varies by vehicle and location
The clutch pedal switch "A" circuit is reading low voltage. This typically means the switch is stuck in the closed/grounded position, there is a short to ground in the wiring, or the switch is misadjusted and constantly depressed. The PCM may think the clutch is always pressed, which can affect star...
The most common cause of P0831 (Clutch Pedal Switch "A" Circuit Low) is: Clutch pedal switch "A" stuck closed or misadjusted — always grounded
Typical repair costs for P0831 range from $20 to $150, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The PCM may believe the clutch is always depressed, which could allow the engine to start without the clutch being pressed. While the vehicle is drivable, the safety interlock is compromised. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0831 to identify the root cause.
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Quick Info
Category
Powertrain
System
Starting/Clutch Interlock System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
