P0835 code definition
A P0835 trouble code signifies that the Powertrain Control Module (PCM) has detected a problem with the clutch position sensor circuit. This trouble code is only found in vehicles with a manual transmission, otherwise the vehicle PCM is faulty. Related codes include P0833 and P0834 trouble codes.
What the P0835 code means
When a voltage reading outside of manufacturer's specifications is detected by the PCM from the clutch position sensor circuit, a P0835 trouble code is stored and the Check Engine light illuminates. Mechanics should keep in mind that some vehicle models require multiple failure cycles before the Check Engine light comes on.
What causes the P0835 code?
A misadjusted or defective clutch position sensor is the most likely cause of a P0835 trouble code. Faulty wiring or connectors is another common cause of this code, including shorted, open, or corroded components.
What are the symptoms of the P0835 code?
Symptoms of a P0835 trouble code can range from no obvious signs of a problem to the failure of the vehicle engine to start. In addition, another sign of a P0835 trouble code include the engine starting without the need for the clutch to be engaged.
How does a mechanic diagnose the P0835 code?
An advanced scanner, digital volt/ohmmeter, and a manufacturer's wiring diagram for the vehicle are all required tools needed by a mechanic to diagnose a P0835 trouble code. In addition to the necessary equipment, a mechanic needs to perform the following:
- Visually inspect all wiring and connectors associated with the clutch position sensor.
- Clear the trouble code and test the system to see if the code returns.
- If everything checks out as okay, download all stored trouble codes and freeze frame data using the scanner.
- If the code returns, the mechanic should use the digital volt/ohmmeter to check the voltage reading on the input side of the clutch position sensor.
- If no voltage is detected, the mechanic should disconnect all related control modules and then check for continuity between the input circuit of the clutch position sensor and the system fuse.
- If voltage is present on the input side of the clutch position sensor, press the clutch and check the voltage readings on the output side.
- If voltage is present, check the resistance and continuity between the clutch position sensor switch and the PCM. The mechanic should disconnect all related control modules to avoid damage when doing so.
- If needed, test all related circuits using the manufacturer's wiring diagram.
- If, after clearing, the trouble code persists, test the PCM for fault.
- Clear the trouble code and retest the system to see if the code comes back.
Common mistakes when diagnosing the P0835 code
The misdiagnosis of the starter solenoid being at fault is a common mistake made by mechanics when fixing this trouble code. By erroneously fixing the wrong part, the P0835 trouble code returns.
How serious is the P0835 code?
While sometimes a P0835 trouble code shows no symptoms of a problem, more often than not, vehicle drivers can expect to encounter problems when starting an affected vehicle. This includes the vehicle starting without having to press in the clutch pedal and in the vehicle refusing to start at all. As such, it is important that a vehicle owner get their vehicle diagnosed by a mechanic and the problem fixed as soon as possible.
What repairs can fix the P0835 code?
Repairing a P0835 trouble code requires a mechanic to do the following:
- Replace any faulty wiring or connectors, making sure that all connections are in place and tight.
- Replace the clutch position sensor if the input voltage readings come back as abnormal.
- Replace the clutch position sensor switch if the there is no output voltage detected when the switch is depressed.
- Replace the PCM if it is found faulty after further testing.
Need help with a P0835 code?
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This article originally appeared on YourMechanic.com as P0835 OBD-II Trouble Code: Clutch Pedal Switch B Circuit High and was authored by Cheryl Knight.