P0808

Code

LAND ROVER P — Powertrain

Clutch Position Sensor - High Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 19 EN: 105 RU: 46

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Page language: EN

Causes

Damaged or disconnected sensor wiring (open or short-to-voltage)
Corroded/loose connector or pins at the sensor
Failed clutch position sensor (potentiometer/Hall/optical)
Poor or missing ground on sensor circuit
Short to battery voltage on the signal wire
Faulty transmission control module (TCM)/ECU or internal driver fault

Symptoms

Check Engine / Transmission warning lamp illuminated
No-start or engine wont-crank interlock (if clutch pedal switch used for starting)
Loss of cruise or limp-home mode / restricted shifting
Inability to engage gears or unexpected gear selection behavior
Intermittent starting or clutch-related faults
Stored transmission/shift-related faults and degraded driveability

What to check

Read and record freeze frame and all related DTCs using a diagnostic scanner
Visual inspection of sensor, connector, and wiring harness for damage, corrosion, or water intrusion
Check for poor battery voltage or weak battery that can affect electronics
Backprobe sensor connector and check for proper connector seating and bent pins
Check fuses and fusible links related to transmission/sensor power and grounds

Signal parameters

Typical sensor wiring: 3 wires — 5V (or ignition-switched) reference, signal, ground (some systems use 12V feed)
Expected idle/operational signal voltage range: approximately 0.2–4.8 V (varies by sensor type) — a ‘high’ fault usually shows stuck near supply (e.g., >4.5 V)
Supply/reference voltage: about 5 V (or ignition-switched supply); should be present with key on
Ground continuity: near 0 ohms to chassis ground
Open-circuit: very high or no signal; short-to-voltage: signal equals supply voltage

Diagnostic algorithm

Connect a capable scan tool; record freeze frame and related codes (e.g., clutch/gear/TCM codes) and note vehicle conditions
Perform visual inspection: harness, routing, rubbing points, connector seals, moisture, and pin condition
With key ON (engine OFF) backprobe connector: verify sensor supply/reference voltage present and stable (≈5 V or specified)
Measure signal voltage while slowly operating clutch pedal/pedal position: signal should move smoothly within the expected range; note if it is stuck high
Check ground at sensor connector: measure voltage drop to battery negative while operating pedal; excessive voltage indicates poor ground
If supply and ground are good but signal is high, disconnect sensor and measure circuit voltage; if signal remains high with sensor disconnected, suspect wiring short to voltage or TCM driver fault
Check continuity/resistance of signal wire to the ECU/TCM pin to rule out open wiring (power off) and check for shorts to battery with ignition off
If wiring checks pass and harness is good, replace the clutch position sensor, then clear codes and perform relearn (if required) and road test
If fault persists after sensor replacement, test/replace the TCM or perform bench diagnostics per manufacturer procedures

Likely causes

Broken or chafed signal wire shorted to battery feed
Connector pin pushed out or corroded causing intermittent high reading
Sensor internal electronics failed (output stuck high)
Blown/shorted sensor supply fuse or related power feed issue
Poor engine/transmission ground raising reference voltage

Fault status

⚠️ Status

Manufacturer DTC P0808 — Clutch Position Sensor Circuit High. The sensor signal is higher than the acceptable circuit limit (open or short-to-voltage condition).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P0808 — Clutch Position Sensor - High Circuit