P0806

Clutch Position Sensor Circuit Range/Performance

P0806 is a generic OBD-II powertrain diagnostic trouble code: Clutch Position Sensor Circuit Range/Performance. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0806
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P0806 means

P0806 is stored when the PCM or transmission control module detects that the clutch position sensor signal is electrically present but outside the expected range or not tracking the expected position profile. On most vehicles this sensor is used on manual transmissions to report when the clutch is engaged or disengaged; some electronically actuated and dual-clutch transmissions also monitor clutch position for engagement control. A range or performance fault means the reported position is implausible given other inputs such as gear position, vehicle speed, and engine torque.

The condition typically stems from a faulty or contaminated sensor, a sensor that is out of adjustment or loose so it does not track full clutch travel, or wiring and connector problems that distort the signal. Mechanical issues such as clutch wear or a hydraulic fault can also reduce total clutch travel so the sensor never reaches the calibrated end points.

Because the module may use clutch position to enable or inhibit starting and to manage engagement, symptoms range from an illuminated warning lamp to harsh or inconsistent engagement. On some vehicles a safety concern exists if the engine can crank with the clutch state misreported, so the fault should be diagnosed rather than ignored.

Common causes

Most-frequently reported root causes when P0806 is logged.

  • 1
    Faulty or contaminated clutch position sensor producing a shifted or erratic output.
  • 2
    Sensor loose or out of adjustment so it does not track full clutch travel.
  • 3
    Open or shorted wiring in the clutch position sensor circuit.
  • 4
    Poor electrical connection or corrosion at the sensor connector.
  • 5
    Clutch wear reducing total travel so the sensor never reaches its expected end point.
  • 6
    Hydraulic clutch fault limiting travel and keeping the sensor in a narrow range.
  • 7
    Sensor supply voltage or ground reference out of specification.
  • 8
    PCM or TCM internal fault misinterpreting a valid sensor signal.

Symptoms drivers notice

Check engine light or transmission warning lamp illuminated.
Inconsistent or unpredictable clutch engagement point.
Harsh or delayed engagement on electronically actuated transmissions.
Difficulty selecting gears or limp-home restrictions in some applications.
Possible no-start or crank inhibit if the clutch state is misreported for safety interlock.

How to diagnose P0806

A typical diagnostic flow when this code is present.

  1. 1
    Connect a scan tool and retrieve all DTCs, noting whether the engine or transmission module stored the fault.
  2. 2
    View clutch position sensor live data while slowly depressing and releasing the clutch pedal.
  3. 3
    Confirm the signal sweeps smoothly from minimum to maximum without dropouts or spikes.
  4. 4
    Inspect the sensor connector and harness for corrosion, damage, or loose terminals.
  5. 5
    Measure sensor supply voltage and ground reference and compare to specification.
  6. 6
    Check sensor mounting and adjustment so it tracks full clutch travel.
  7. 7
    Replace or readjust the clutch position sensor only after the wiring and supply are confirmed good.

Related powertrain codes

Frequently asked questions

Is P0806 a manual or automatic transmission code?

It is most commonly a manual-transmission clutch position sensor fault, though some electronically actuated and dual-clutch transmissions also monitor clutch position and can set it.

Can P0806 be caused by a worn clutch?

Yes. Significant clutch wear reduces total travel, which can keep the sensor within a narrower range than the calibration expects and trigger a range or performance fault.

Is P0806 a safety concern?

It can be. If the sensor misreports clutch state, the engine may crank with the clutch engaged, so the fault should be diagnosed promptly.

What is the most common repair for P0806?

Replacing or readjusting the clutch position sensor, after ruling out wiring, connector, and supply problems first.

Disabling P0806 in software

RaceTune can permanently disable P0806 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECU families we can disable P0806 on

We hold the DaVinci A2L disable definitions for these families, so the exact P0806 path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.

  • Bosch EDC17C60 verified
  • Bosch EDC17C66 verified
  • Bosch EDC17CP57 verified

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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