Clutch Position Sensor Circuit Range/Performance Malfunction
Your car's clutch position sensor is sending a signal that's outside the normal range, like a volume knob stuck in an unexpected position. The engine computer can't properly track where the clutch is, affecting shift quality and drivability.
The ECM monitors the clutch position sensor's voltage signal to determine clutch engagement status. It expects a voltage sweep from low (clutch fully engaged) to high (clutch fully disengaged) as the pedal moves. If the signal stays erratic, out-of-range, or doesn't transition smoothly, a fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5V–4.5V with smooth transition | Stuck below 0.5V or above 4.5V; erratic jumping |
| Signal Rate of Change | Linear sweep over 1–2 seconds | No movement or rapid spikes/drops |
Code P0806 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0806 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.