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 (TCM) detects that the clutch position sensor signal is electrically present but outside the expected range or not tracking the expected position profile. The clutch position sensor is used on manual-transmission vehicles with electronic clutch engagement monitoring or on dual-clutch automatic transmissions to provide precise feedback on clutch plate position during engagement and disengagement events.

A range or performance fault means the sensor is generating a signal that is within the basic electrical operating window but the implied clutch position is implausible given the other inputs available to the control module, such as gear position, vehicle speed, and engine torque. This can result from a worn or contaminated sensor, a damaged actuator linkage that does not move the sensor through its full travel, or a hydraulic fault that prevents full clutch travel.

Symptoms vary by transmission type. On manual transmissions with clutch monitoring, the engine management system may restrict torque or illuminate the MIL. On dual-clutch units, the fault can result in harsh engagement, incorrect gear selection, or a limp-home mode that limits available gear ratios.

Common causes

Most-frequently reported root causes when P0806 is logged.

  • 1
    Clutch position sensor worn or contaminated causing a shifted output characteristic.
  • 2
    Sensor mounting loose, causing it not to track actual clutch travel accurately.
  • 3
    Damaged or kinked wiring to the sensor causing intermittent signal anomalies.
  • 4
    Hydraulic clutch system fault reducing clutch travel and keeping the sensor in a narrow range.
  • 5
    Clutch wear reducing total travel so the sensor never reaches the expected minimum position.
  • 6
    Corrosion at the sensor connector altering the effective reference or signal voltage.
  • 7
    TCM or PCM internal fault misinterpreting a valid sensor signal.

Symptoms drivers notice

MIL or transmission warning light illuminated.
Harsh or delayed clutch engagement on dual-clutch transmissions.
Difficulty selecting certain gears or unexpected gear lockout in limp mode.
Clutch engagement point may feel inconsistent or unpredictable.
Possible transmission shudder during launch or low-speed maneuvering.

How to diagnose P0806

A typical diagnostic flow when this code is present.

  1. 1
    Connect a scan tool and retrieve all DTCs; note whether the transmission or engine control module stored the fault.
  2. 2
    View clutch position sensor live data while an assistant slowly depresses and releases the clutch pedal or during TCM-commanded engagement.
  3. 3
    Confirm the sensor sweeps smoothly from minimum to maximum position without dropouts or spikes.
  4. 4
    Inspect the sensor connector and harness for moisture intrusion, corrosion, or damaged insulation.
  5. 5
    Check the clutch hydraulic system for correct fluid level and absence of air if hydraulic actuation is used.
  6. 6
    Measure sensor supply voltage and ground; confirm they are within specification.
  7. 7
    Replace the clutch position sensor if the sweep is erratic and the electrical supply is confirmed good.

Related powertrain codes

Frequently asked questions

Can P0806 be caused by a worn clutch?

Yes. Significant clutch wear reduces total plate travel, which can keep the position sensor within a narrower range than the calibration expects, triggering a range fault.

Does P0806 only affect dual-clutch transmissions?

No. Some manual-transmission vehicles with electronic clutch monitoring also use a clutch position sensor, though dual-clutch automatic transmissions are the most common application.

Will the car still drive with P0806 active?

Often yes, but with possible limp-home restrictions or harsh shifting. On dual-clutch transmissions, the control module may limit available ratios to protect the clutch assembly.

Is P0806 the same as a clutch pedal position sensor fault?

Related but distinct. P0806 refers to the actual clutch engagement sensor at the clutch pack or actuator, while clutch pedal position sensors are monitored by separate codes.

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.

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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