Diagnostic article Generic OBD-II
P0806: Clutch position conflicts with evidence that the vehicle is in gear
P0806 compares clutch-pedal information with engine and vehicle-speed evidence in this GM performance check.
Read before applying this article
Documented application
2009 General Motors diagnostic parameter file 09OBDG01 GMDAT Engine Diagnostics.pdf. Section-specific modules and calibrations; no per-code model or engine applicability established.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
The P0806 strategy in GM's GMDAT summary detects a clutch-position signal stuck in a range suggesting the vehicle is not in gear when other evidence says it is. It is therefore more than a simple high- or low-voltage test of the pedal sensor.
Gear evidence provides the contradiction
The controller uses the engine-speed-to-vehicle-speed relationship to confirm an actual gear. The check also requires sufficient engine torque and vehicle speed, and excludes the relevant low-range transfer-case condition. Those prerequisites make the disagreement meaningful.
The published filtered position-error threshold is five percent for this implementation. Other GM documents use different calibrations, so that value must not become a universal pedal-adjustment specification.
Invalid reference signals can prevent the test
Clutch-sensor circuit faults, crank information faults and transmission-output-speed errors inhibit this performance comparison. If a reference input is unreliable, the controller cannot make the same in-gear judgment. An incomplete monitor in that state is not a passing result.
Preserve pedal position, gear-related speed evidence and companion faults together. The summary does not prove whether the problem is sensor accuracy, learning, wiring or physical pedal operation. Use the exact service procedure to distinguish those possibilities. Verification should establish credible clutch information during qualified in-gear operation and completed monitoring, not merely a plausible voltage while the vehicle is stationary.
Source and applicability
2009 General Motors diagnostic parameter file 09OBDG01 GMDAT Engine Diagnostics.pdf. Section-specific modules and calibrations; no per-code model or engine applicability established. This explanation describes the documented monitor, not a universal repair procedure.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Clutch Position Sensor A Circuit Range/Performance
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT