P0835 — Clutch Position Switch B Circuit High

Causes

• Short to battery positive (12 V) in the clutch switch signal wire
• Corroded/damaged connector or pin at the switch or ECU
• Faulty/clogged clutch position switch (internal short or failed)
• Incorrect or damaged aftermarket wiring or splice
• Open or high resistance to ground/pull‑down circuit
• Faulty ECU/input circuit (rare)

Symptoms

• Malfunction Indicator Lamp (MIL) illuminated (fault stored)
• Engine may not crank or starter disabled (clutch interlock) on some models
• Cruise control or launch control disabled
• Start/shift interlock or engine start behavior abnormal
• Intermittent faults — code may return after clearing

What to check

• Read freeze‑frame and live data for clutch switch B state with scan tool
• Inspect harness and connector at clutch switch and at ECU for damage, corrosion, pins
• Back‑probe switch connector and measure voltage with key ON, engine OFF
• Operate clutch pedal and observe signal change (open/closed) while monitoring voltage
• Check continuity from switch signal pin to ECU terminal and to battery/ground as required
• Wiggle harness and operate pedal while watching live data for intermittent changes

Signal parameters

• Reference: design varies by model — ECU may use internal pull‑up to battery or to regulated 5 V (consult service manual)
• Expected closed (clutch depressed): near 0.0–0.5 V (pulled to ground) for grounded‑switch designs
• Expected open (clutch released): near battery voltage (approx 9–14 V) if pulled up to B+, or ~4–5 V if pulled up to 5 V
• Fault indication: measured voltage higher than expected threshold or constant high when it should be low
• Use a digital voltmeter or scope; check for voltage spikes, noise, or intermittent steps

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