P0335 - Crankshaft Position Sensor A Circuit Malfunction
P0335 is an engine position sensor, circuit, or signal integrity fault. Confirm signal quality and mechanical timing context before replacing sensors.
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Check coil boots, carbon tracking, and whether the miss follows a swap.
Inspect gap, fouling, wear, oil, coolant, and plug-well condition.
Move to injector balance, pulse, or leak-down checks if the misfire stays.
Use compression or leak-down testing when spark and fuel checks do not move the fault.
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Code Overview
P0335 is an engine position sensor, circuit, or signal integrity fault. Confirm signal quality and mechanical timing context before replacing sensors.
Common Causes
- Crankshaft or camshaft position sensor signal dropout, heat failure, or contamination
- Connector corrosion, loose pins, damaged shielding, or harness rub-through
- Reluctor wheel damage, metal debris, excessive air gap, or sensor mounting issue
- Timing chain stretch, slipped timing, phaser issue, or cam/crank correlation fault
- Low battery voltage or starter draw reducing cranking signal quality
- PCM input fault only after waveform and circuit checks support it
Symptoms
- Cranks but will not start
- Intermittent stall
- Extended crank
- Tachometer dropout
- Misfire-like rough running
Diagnostic Steps
- Check cranking RPM and whether RPM drops out during no-start or stall events
- Inspect CKP/CMP connectors, harness routing, oil intrusion, heat damage, and sensor mounting
- Scope crank and cam signals for missing pulses, noise, weak amplitude, or correlation errors
- Check power, ground, reference, and signal continuity before replacing sensors
- Inspect reluctor condition, timing marks, chain stretch, or phaser faults if correlation codes are present
- Verify repair with hot restart, extended road test, and stable RPM/cam data
Repair Difficulty
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