Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0831 OBD-II Trouble Code: Clutch Pedal Switch "A" Circuit Low

P0831 OBD-II Trouble Code: Clutch Pedal Switch "A" Circuit Low

check engine light

What the P0831 code means

In vehicles with manual transmissions, the clutch position sensor (CPS) is also sometimes called the clutch start switch, clutch safety switch or clutch interlock switch since it needs to be closed before the starter can engage, in order to prevent the vehicle from being started while in gear. `A P0831 code means that the powertrain control module (PCM) has registered a malfunction with the clutch position sensor.

What causes a P0831 code?

Most commonly, a P0831 code is due to a failed or mis-adjusted CPS . Other causes might include problems with wiring or electrical connectors, such as open circuits, shorts or corrosion.

What are the symptoms of a P0831 code?

Symptoms may not present themselves at all, or could include:

  • No-start condition
  • Engine can start without the clutch depressed
  • Stored code
  • Illuminated malfunction indicator lamp (MIL)
  • Inoperative cruise control

How does a mechanic diagnose a P0831 code?

A scan tool/code reader and digital volt/ohmmeter (DVOM) will be needed for diagnosis and repair. The DVOM may be the more useful, as it can show the technician what the clutch pedal switch is actually doing and not just what the PCM registers. A repair manual for the vehicle and factory wiring diagram can help show the exact location of the switch.

  • Check to ensure all connectors are properly seated in place and there is no corrosion, water infiltration or bent/backed out pins. Any of these can increase resistance and prevent the ECM from recognizing a signal. Repair/replace as needed.

  • With the parking brake set, disconnect CPS sensor “B.” Use your DVOM to measure continuity and check the sensor’s response with the clutch pedal depressed or released. Check your repair manual to find out if the CPS should read “open” or “closed” in each position, as this can vary from model to model.

  • If resistance does not change with the pedal released or depressed, it could be a problem with the switch. If the switch is adjustable, you may be able to position it closer to the pedal. If the switch is open or internally shorted, it will need to be replaced.

  • If resistance across the switch in each position is within spec, the problem may be in the circuit. Disconnect the appropriate connector at the PCM and reconnect the CPS sensor. Repeat the resistance check at the PCM connector.

  • If resistance does not change with the clutch depressed or released, the problem is likely in the wiring harness. Disconnect the CPS and recheck. A short circuit or any kind of resistance may interfere with the CPS.

  • If resistance changes as it should, the PCM may be reporting a false circuit problem. See remarks.

Common mistakes while diagnosing P0831 code

Often, a no-start condition with the P0831 code is misdiagnosed as a problem with the starter.

How serious is a P0831 code?

A P0831 code can result in:

What repairs can fix a P0831 code?

Replacement or adjustment of CPS, or replacement/repair of corroded or damaged wiring to CPS.

Additional comments for consideration for P0831 code

Some drivers have the bad habit of “riding the clutch,” with one foot on the clutch even when it’s fully released. A foot that is only slightly on the clutch pedal can be enough to prevent the CPS from sensing that the clutch is released, resulting in a P0831 code. It has also been reported that in some General Motors models, the PCM may not recognize CPS switches in rapid succession. In other words, by pressing and releasing the clutch a few times, the PCM may fail to recognize further switches from the CPS, resulting a P0833 code.

Need help with a P0831 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: VTC problem - 2008 Infiniti FX50S

The engine control system uses the engine oil pressure to control the variable intake valve timing on this model. If the engine oil is low or very dirty it can trigger this type of fault and cause the system to...

Q: 2009 Chrysler Sebring intake manifold runner problems

I'm guessing you have the common P2004 code, which stands for 'Intake Manifold Runner Stuck Open.' While the manifold runner valve is a common reason for this code, there are other potential culprits as well. A mechanical problem with the...

Q: I changed out the camshaft position sensor, the car is still stalling and hard to start. It now shows a different P code.

The coolant temperature sensor (CTS) in your vehicle has failed and is making the computer think that the engine is too hot. When you shut off the engine and the engine will not restart, is it because the computer thinks...