What does it mean?
This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Volvo, Toyota, Ford, Honda, Jeep, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.
If your vehicle has stored a P0810 code, it means that the Powertrain Control Module (PCM) has detected a malfunction in the clutch position control system. This code applies only to vehicles with manual transmissions.
The clutch position sensor provides a secondary safety function to prevent the engine from starting when the transmission is engaged. It is typically a two-position switch that is open with the clutch pedal in the up position and closed when it is depressed. Clutch position sensors are usually located under the dashboard on the driver’s side, on the clutch pedal pivot arm bracket.
The Transmission Control Module (TCM) can be a standalone unit but is most often integrated into a single housing with the Engine Control Module (ECM). This is referred to as the PCM. The PCM calculates input data from the transmission input speed sensor, output speed sensor, and vehicle speed sensors to determine the desired position of the clutch pedal position sensor.
If the PCM detects a malfunction in the clutch position control circuit or detects that the clutch pedal is not in the correct position for current conditions, a P0810 code will be stored and a Malfunction Indicator Lamp (MIL) will illuminate. Several ignition cycles (with a fault) may be required for the MIL to illuminate.
How severe is this DTC?
A stored P0810 code indicates there is a problem in the clutch pedal position sensor circuit. Since the clutch pedal position sensor can disable engine starting or allow the engine to start with the transmission engaged, this code should be classified as severe.
What are some of the symptoms of the code?
Symptoms of a P0810 trouble code may include:
- The starter will not engage the flywheel to start the engine
- The engine starts with the transmission engaged
- No symptoms may be present
What are some of the common causes of the code?
Causes of this code may include:
- Faulty clutch position sensor
- Open or shorted wiring or connectors in the clutch position sensor control circuit
- TCM, PCM, or controller programming error or incorrect controller
What are the troubleshooting steps for P0810?
A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle-specific diagnostic information will be needed to diagnose a P0810 code.
You can use your vehicle information source to locate a Technical Service Bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms. If you find one, it may provide useful diagnostic information.
Step 1
Use the scanner (connected to the vehicle’s diagnostic connector) to retrieve all stored codes and relevant freeze frame data. It is a good idea to record this information before clearing the codes, then test drive the vehicle until the PCM enters readiness mode or the code resets.
If the PCM enters readiness mode at that point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to the code being stored may need to worsen before an accurate diagnosis can be made.
Step 2
If the code resets immediately, the next step in your diagnosis will require you to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, and component testing procedures/specifications.
Step 3
Use the DVOM to test the voltage and ground circuits at the clutch position sensor. If voltage and ground are present, use the DVOM to test the output of the clutch pedal position sensor.
Step 4
If the clutch pedal position sensor is functioning correctly, use the DVOM to test the system circuits. The voltage drop testing method works well for this task. Disconnect all controllers from the circuit before testing resistance with the DVOM.
If a P0810 code is stored in a vehicle with an automatic transmission, suspect a PCM/TCM failure or a programming error.