P0809 Clutch position sensor: signal drops out at times (clutch position)

By: Diagno editorial team · Updated: 2026-10-15

P0809 means: Clutch position sensor: signal drops out at times (clutch position). The automatic gearbox module has found a fault. Drive gently and have the car checked soon. The most common repair costs about €45–90 in Estonia, depending on make and model. The most common cause: connector loose, damp or corroded.

What it means

The automatic gearbox module has found a fault. The gearbox may go into limp mode: it holds one gear and shifts harshly or not at all. The signal drops out now and then. The most common cause is a loose connector or a chafed wire.

What you may notice

• Stuck in one gear (limp mode)
• Harsh or late gear changes
• Gearbox slipping
• Engine or gearbox light on

What could be wrong

1. 1Connector loose, damp or corroded · Wiring or connector repair €45–90
2. 2Wire broken or chafed · Wiring or connector repair €45–90
3. 3Faulty solenoid or sensor · Gearbox solenoid replacement €250–500
4. 4Engine computer fault (rare) · Control unit check and software €150–300

Repair difficulty: Hard

What you can check yourself

First look at the connector and wiring: anything loose, melted or green with corrosion? Read the gearbox module's own codes too. If the gearbox slips, drive gently and don't tow a trailer. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

1. We read the fault data on the diagnostic tool and check whether the fault is constant
2. We measure the circuit's supply, ground and signal
3. We repair the wire or replace the connector
4. If the wiring is fine, we replace the solenoid or sensor

Standard SAE description: Clutch Position Sensor Circuit Intermittent