P0808Generic code

P0808 Code: Clutch Position Sensor Circuit High

The P0808 code means the clutch position sensor signal is above its maximum value. The main effect is a clutch the computer cannot control, or a start-stop system that is turned off. An open circuit or a broken ground is the usual cause.

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 P0808 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 high signal, which sets the P0808 code, is usually caused by an open circuit or an interrupted ground.

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

To confirm it, measure the continuity of each wire between the component connector and the computer connector with the key off. It should be under 1 ohm, and an infinite reading means the wire is open. If the wiring is good, measure the component itself: an infinite resistance confirms it is open inside.

P0808 code symptoms

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

Likely causes of the P0808 code

  1. Connector loose or broken. The most frequent cause.
  2. Signal or ground wire cut, so the signal rises to the reference.
  3. Sensor open inside, with infinite resistance.
  4. Short to 5 V or 12 V from rubbing against another wire in the harness.

How to diagnose the P0808 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 P0808 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 P0808

What does the P0808 code mean?
It is a generic OBD2 code that means the clutch position sensor signal is above its maximum value. That usually points to an open circuit or an interrupted ground.
Can I drive with a P0808 code?
Yes, with caution. With a P0808 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 P0808?
As a rough guide, between $60 and $600.
Will a P0808 code clear itself?
Not if a wire is cut or the sensor is open inside. If the connector only lost contact for a moment, the light can go out, but the code will probably return.
What is the most common cause of P0808?
A loose or broken connector. A cut signal or ground wire is next.

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