Code
P08B7
Generic
P — Powertrain
Clutch Pedal Position Sensor B Circuit High
Views:
UK: 20
EN: 25
RU: 19
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the sensor signal wire
- Faulty clutch pedal position sensor (sensor B)
- Damaged wiring harness (chafing, pinched, melted)
- Corroded or loose connector or terminals
- Poor or missing ground or reference voltage
- Water or contamination in connector
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect or fixed clutch pedal position reported in live data
- Intermittent or no engine cranking if clutch-start interlock used
- Transmission shift or torque management anomalies
- Cruise control or start-in-gear interlock faults
What to check
- Read freeze frame and PID data with a scan tool; note symptom conditions
- Visually inspect sensor, pedal area, wiring harness, and connector for damage or contamination
- Backprobe sensor connector with key ON (engine OFF) and measure signal voltage
- Verify reference voltage (typically 5V) and ground at sensor connector
- Wiggle test wiring while monitoring live data for intermittent changes
- Check continuity between sensor ground and chassis/ECU ground
Signal parameters
- Reference voltage (typical): ~5.0 V (varies by manufacturer)
- Signal voltage normal range: ~0.5–4.5 V depending on pedal position
- Circuit High condition: signal above upper threshold (often >4.8 V) or pinned to B+
- Ground: 0 V reference; continuity to chassis/ECU ground expected
Diagnostic algorithm
- Retrieve DTC, freeze-frame, and review vehicle symptoms with scan tool.
- Verify code is current (not pending). Clear code and road test to confirm repeatability.
- Visually inspect sensor, harness, and connectors for damage, corrosion, water intrusion, or rodent chew.
- With ignition ON (engine OFF) backprobe sensor connector: check reference voltage (~5V) and ground presence.
- Measure sensor signal voltage at rest and while moving clutch pedal. Note if signal is stuck high or jumps to battery voltage.
- If signal is high, disconnect sensor: if signal remains high with sensor unplugged, suspect wiring short to B+ or ECU fault; if signal goes out/open, suspect sensor short internally.
- Check continuity between signal wire and battery positive for short to B+. Repair any shorted wiring or damaged insulation.
- Repair or replace corroded connectors or terminal pins. Re-pin connector if necessary.
- Replace clutch pedal position sensor (B) if tests indicate internal failure.
- After repairs, clear DTC, perform functional test and verify live data changes across pedal travel; confirm code does not return.
- If wiring and sensor check good but code persists, consider ECU input circuit testing or replacement by qualified shop.
Likely causes
- Sensor B failed or internal short inside sensor
- Signal wire shorted to B+ near pedal or in harness
- Connector pins pushed out, corroded, or contaminated
- Open/poor ground or missing 5V reference from ECU
- Terminal damage from aftermarket work or repairs
Fault status
Status
Clutch Pedal Position Sensor B Circuit High — signal voltage higher than expected (possible short to battery or failed sensor).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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