Clutch Position Sensor Circuit High
P0808 indicates the clutch position sensor circuit is reading a voltage signal that is higher than the expected maximum threshold. This prevents the PCM from accurately detecting clutch pedal position, which can affect transmission shift logic and engine starting procedures.
What You Might Notice
- Check engine light illuminated
- Transmission warning lamp illuminated
- Engine will not start or hard start condition
- Motor starts without requiring clutch pedal engagement
- Transmission shifting issues or limp mode activation
Most Common Causes
- 1
Defective clutch position sensor
The sensor itself may have failed internally, causing it to send a constant high voltage signal to the PCM regardless of actual pedal position.
- 2
Corroded or damaged connector
Corrosion, water damage, or loose pins in the sensor connector can cause erratic high voltage readings on the circuit.
- 3
Faulty or damaged wiring
Damaged insulation, pinched wires, or broken conductors between the sensor and PCM can create high resistance conditions that elevate voltage readings.
- 4
Loose or defective control module ground strap
A poor ground connection at the PCM or sensor can cause voltage reference errors, resulting in incorrectly high sensor readings.
How to Diagnose It
- 1
Check Defective clutch position sensor — The sensor itself may have failed internally, causing it to send a constant high voltage signal to the PCM regardless of actual pedal position.
- 2
Check Corroded or damaged connector — Corrosion, water damage, or loose pins in the sensor connector can cause erratic high voltage readings on the circuit.
- 3
Check Faulty or damaged wiring — Damaged insulation, pinched wires, or broken conductors between the sensor and PCM can create high resistance conditions that elevate voltage readings.
- 4
Check Loose or defective control module ground strap — A poor ground connection at the PCM or sensor can cause voltage reference errors, resulting in incorrectly high sensor readings.
How to Fix It
- 1
Replace clutch position sensor
Remove and install a new OEM or quality replacement clutch position sensor, ensuring proper connector seating and torque specifications.
- 2
Inspect and repair wiring and connectors
Visually inspect the sensor circuit wiring for damage, corrosion, or loose connections. Clean corroded connectors with electrical contact cleaner and ensure all pins are properly seated and crimped.
- 3
Check and reseat PCM ground strap
Locate the PCM ground strap connection and verify it is tight and free of corrosion. Clean the connection point and retorque the fastener to specification.
- 4
Replace PCM or TCM if required
If wiring, connectors, and sensor replacement do not resolve the code, the PCM or TCM may have a faulty input circuit requiring replacement or reprogramming.
Need a deeper diagnosis?
Search for related repair guides or browse by system.