Clutch Position Sensor Circuit High Input
The P0808 code means the vehicle's onboard diagnostic system has detected: Clutch Position Sensor Circuit High Input. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $40 - $300 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Cruise control inoperative
- PCM reads clutch as always engaged
- Possible no-start condition
Probable Causes (Ranked by Likelihood)
- Open circuit in clutch position sensor ground wire Very High
- Faulty clutch position sensor stuck high High
- Short to voltage in the sensor signal wire Moderate
- PCM reference voltage issue Low
Step-by-Step Diagnostic Procedure
-
Measure voltage at the clutch position sensor with key on, engine off
-
Check for an open ground wire at the sensor connector
-
Look for a short to battery voltage in the signal wire
-
Test sensor operation by monitoring live data while pressing the clutch pedal
Frequently Asked Questions
What does high input mean for the clutch sensor?
High input means the voltage on the signal wire is above the expected maximum. This is often caused by an open ground or a short to the voltage supply.
Can I test the clutch position sensor with a multimeter?
Yes. With the sensor connected, backprobe the signal wire and check for voltage change as you press and release the clutch. If it stays high, the sensor or wiring is faulty.
Is P0808 the opposite of P0807?
Yes. P0807 indicates the signal is too low while P0808 indicates it is too high. Both point to issues with the clutch position sensor circuit.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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