What Does P0808 Mean?
The Clutch Position Sensor circuit is reading abnormally high voltage. The PCM has detected that the CPS signal voltage exceeds the maximum expected threshold. This usually indicates an open in the signal circuit, a short to voltage, or a sensor that is failing in a way that produces a maximum output regardless of clutch pedal position.
Common Causes
30%
Open circuit in the CPS signal or ground wire
25%
Disconnected or damaged CPS connector
25%
Failed clutch position sensor with open internal element
12%
Short to battery voltage in the CPS signal circuit
8%
PCM ground fault on the sensor return circuit
Diagnostic Steps
1
Verify the CPS connector is fully seated and not disconnected — a loose or unplugged connector is the most common cause of a high signal.
2
Measure voltage at the CPS connector with key on: check for proper 5V reference, signal, and ground on the correct pins.
3
If the ground wire shows no continuity to the PCM ground pin, trace and repair the open ground circuit.
4
Inspect for damaged wiring where the CPS harness may contact a power wire, creating a short to voltage.
5
Substitute a known-good sensor temporarily to isolate whether the fault is in the sensor or the wiring.
Estimated Repair Cost
$40 - $350
Parts + labor, varies by vehicle and location
The Clutch Position Sensor circuit is reading abnormally high voltage. The PCM has detected that the CPS signal voltage exceeds the maximum expected threshold. This usually indicates an open in the signal circuit, a short to voltage, or a sensor that is failing in a way that produces a maximum outpu...
The most common cause of P0808 (Clutch Position Sensor Circuit High Malfunction) is: Open circuit in the CPS signal or ground wire
Typical repair costs for P0808 range from $40 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven, but the PCM will interpret the clutch as always released or in an unknown state. The starter interlock may prevent engine cranking if it depends on the clutch switch signal. Cruise control may not disengage on clutch press.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0808 to identify the root cause.
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Quick Info
Category
Powertrain
System
Clutch / Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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