P0806Generic code

P0806 Code: Clutch Position Sensor Circuit Range/Performance

The P0806 code means the clutch position sensor gives a reading that is electrically valid but does not match what the computer expects. The main effect is a clutch the computer cannot control, or a start-stop system that is turned off. The sensor may be measuring badly, or there may be a real abnormal condition.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$60 to $600
Difficulty
Medium
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0806 code means

On automated manual transmissions and on some vehicles with start-stop, a sensor measures the exact position of the clutch (or of the pedal). The computer uses it to control how the clutch engages, or to know when to restart the engine.

The sensor receives a 5 V reference and a ground from the computer and returns a signal of roughly 0.5 to 4.5 V. A range fault, the P0806 code, means the sensor is measuring, but measuring wrong, or that there is a real abnormal condition.

If the signal fails, the automated transmission cannot control the clutch and goes into limp mode, or the start-stop system stops working.

This kind of fault is rarely solved with a multimeter, because everything looks right electrically. You have to compare what the part reports with reality: use a pressure gauge, a thermometer, a tachometer, or command the component with the scan tool and see whether the physical result matches the order.

P0806 code symptoms

  • Check engine light on.
  • Clutch not controlled, or start-stop disabled.

Likely causes of the P0806 code

  1. Sensor that is degraded or out of calibration. It gives believable but wrong readings.
  2. A real abnormal condition. The system is actually working outside the normal range.
  3. High resistance in the connector from corrosion, which shifts the reading.
  4. Damaged or blocked port, hose or tone wheel, depending on the type of sensor.

How to diagnose the P0806 code step by step

  1. Read the sensor value on the scan tool and compare it with what is expected.
  2. Inspect the connector for corrosion, water or loose pins.
  3. Check power and ground with the key on: a correct reference and less than 0.1 V of drop on the ground.
  4. Measure the signal with the connector plugged in and see whether it changes with the condition.
  5. Do the wiggle test on the harness with the scan tool in graphing mode.
  6. Check the continuity of each wire up to the computer (under 1 ohm).
  7. Run the clutch touch point relearn after the repair, if it is an automated manual transmission.

How to fix the P0806 code

  • Repair the connector or the wiring.
  • Replace the sensor if the tests confirm it.
  • Correct the real condition, if there is one.
  • Clear the codes and verify with a road test.

Technical reference data

  • 5 V reference, ground and a signal of 0.5 to 4.5 V.
  • These are approximate values: check the manufacturer data for your vehicle.

Brand-specific notes

The letter assignment and the location of the component change from one manufacturer to another, so check the manual for your vehicle.

Frequently asked questions about P0806

What does the P0806 code mean?
It is a generic OBD2 code that means the clutch position sensor gives a reading that is valid electrically but does not match what the computer expects. The sensor may be measuring badly, or there may be a real abnormal condition.
Can I drive with a P0806 code?
Yes, with caution. With a P0806 code an automated manual transmission may go into limp mode, or the start-stop system may stop working, so keep trips short until it is repaired.
Does the sensor have to be replaced?
Only if the tests confirm it. The connector and the wiring fail just as often.
What does the clutch position sensor do?
On automated manual transmissions and on some vehicles with start-stop, a sensor measures the exact position of the clutch (or of the pedal). The computer uses it to control how the clutch engages or to know when to restart the engine.
How much does it cost to fix P0806?
As a rough guide, between $60 and $600.
Will a P0806 code clear itself?
It can go out if the odd reading does not repeat. A degraded sensor or a high-resistance connector usually brings the code back.
What is the most common cause of P0806?
A degraded sensor giving believable but wrong readings, or a corroded connector that adds resistance and shifts the reading. Check the connector before you buy a sensor.

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