P0805
UniversalClutch Position Sensor Circuit Malfunction
Medium SeverityThe Clutch Position Sensor (also known as the clutch safety switch) provides critical information to the engine computer about the position of the clutch pedal. A malfunction in this circuit means the computer may not know if the clutch is pressed, which can prevent the engine from starting or disable features like cruise control.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is in Neutral with the parking brake engaged before working on it. Disconnect the battery before inspecting electrical components to prevent accidental short circuits or unexpected engine starts. Be cautious when working under the dashboard to avoid injury.
Common Symptoms
- Engine will not crank or start
- Cruise control system is inoperative
- Check Engine Light (CEL) illuminated on the dashboard
- Engine cranks without the clutch pedal being pressed (less common, indicates sensor stuck 'engaged')
Common Causes
- Faulty or worn Clutch Position Sensor
- Corroded, damaged, or loose wiring or electrical connector to the sensor
- Improperly adjusted clutch position sensor
- Blown fuse (less common, but possible if it affects a shared circuit)
- Faulty Powertrain Control Module (PCM) or Engine Control Module (ECM) (rare)
Frequently reported on: Honda Civic (2006-2011), Ford Focus (2000-2011), Subaru WRX (2002-2007), Mazda Miata (1990-2005), Volkswagen Jetta (2000-2005)
Diagnostic Steps
- Locate the Clutch Position Sensor, typically mounted on the clutch pedal assembly under the dashboard.
- Inspect the sensor and its wiring for any visible signs of damage, fraying, corrosion, or loose connections. Secure or repair any found issues.
- With the ignition off, disconnect the sensor's electrical connector. Use a multimeter to test the sensor's continuity or resistance. Compare readings to your vehicle's service manual specifications (e.g., open circuit when pedal is up, closed when down).
- If the sensor is faulty or its wiring is damaged, carefully replace the sensor or repair the affected wiring. Ensure the new sensor is properly adjusted according to manufacturer instructions.
- Reconnect the sensor, clear the P0805 code using an OBD-II scanner, and then test the vehicle by attempting to start it with the clutch pressed and verifying cruise control functionality if applicable.
👨🔧 When to Call a Professional
If the code persists after inspecting and potentially replacing the sensor and its wiring, or if you suspect a deeper electrical issue, consult a professional technician for advanced diagnostics. Intermittent starting problems can be complex to diagnose without specialized tools.
Commonly Asked Questions
Can I drive my car with a P0805 code?
While the car might drive if it starts, the primary concern is the potential for a no-start condition, leaving you stranded. Additionally, cruise control may be disabled, which can be an inconvenience on longer drives.
Where is the clutch position sensor located?
The clutch position sensor is usually found mounted on the clutch pedal assembly, often near the pivot point, under the dashboard on the driver's side.
Is the clutch position sensor the same as the clutch safety switch?
Yes, these two terms are often used interchangeably. It is the switch that ensures the clutch pedal is fully depressed before the engine can be started, acting as a safety interlock.
How much does a new clutch position sensor cost?
A replacement clutch position sensor typically ranges from $20 to $100, depending on your vehicle's make, model, and the sensor's complexity. Labor costs for replacement are usually minimal for DIY or shop service.
Can a bad clutch position sensor prevent my car from starting?
Absolutely. A faulty clutch position sensor is a very common reason for a no-start condition in vehicles with manual transmissions, as the engine's computer will not receive the signal to allow cranking.