What Does P0809 Mean?
The Clutch Position Sensor circuit is exhibiting intermittent electrical behavior. The PCM has detected that the CPS signal drops out, spikes, or changes state unexpectedly and inconsistently. This is distinct from a steady high or low fault — the signal is sometimes correct but periodically fails, indicating a loose connection, marginal component, or wiring issue that only manifests under certain conditions.
Common Causes
35%
Loose or corroded CPS connector with intermittent contact
25%
Chafed or cracked wire in the CPS circuit creating intermittent open
20%
Clutch position sensor with intermittent internal failure
12%
Clutch pedal mechanism with excessive play causing sensor misalignment
8%
PCM connector terminal tension issue on CPS input pin
Diagnostic Steps
1
Monitor the CPS signal on the scan tool continuously while driving over bumps and rough road — watch for signal dropouts that correlate with vehicle vibration.
2
Wiggle test: with key on and scan tool recording, physically wiggle the CPS connector, the wiring harness at several points, and the PCM connector while watching for signal interruptions.
3
Inspect the CPS connector for spread terminals, corrosion, or missing locking tab that would allow the connector to partially unseate.
4
Check the wiring harness routing through the firewall grommet — repeated clutch pedal motion can fatigue wires at stress points.
5
If the sensor mounting is loose, re-secure it and verify alignment — a sensor that shifts position during driving will produce intermittent readings.
Estimated Repair Cost
$40 - $400
Parts + labor, varies by vehicle and location
The Clutch Position Sensor circuit is exhibiting intermittent electrical behavior. The PCM has detected that the CPS signal drops out, spikes, or changes state unexpectedly and inconsistently. This is distinct from a steady high or low fault — the signal is sometimes correct but periodically fails, ...
The most common cause of P0809 (Clutch Position Sensor Circuit Intermittent Malfunction) is: Loose or corroded CPS connector with intermittent contact
Typical repair costs for P0809 range from $40 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive, but intermittent faults can cause unpredictable behavior in cruise control disengagement and starter interlock. If cruise control fails to disengage when clutching, it could be hazardous. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0809 to identify the root cause.
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Quick Info
Category
Powertrain
System
Clutch / Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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