What causes fault code P0349?

• Most likely: Damaged or oxidized wiring harness/connector • Likely: Faulty Camshaft Position Sensor (internal intermittent failure) • Possible: Reluctor wheel/tone ring issues (loose or damaged) • Possible: Low battery voltage or starter motor interference (EMI) • Rare: Faulty Engine Control Module (PCM/ECU)

Powertrain (Engine & Gearbox)Standard EOBD

P0349 - Camshaft Position Sensor A Circuit Intermittent (Bank 2)

Q: What are the symptoms of fault code P0349?

• Check Engine Light (MIL) illuminated • Engine hesitation during acceleration • Rough idling or misfiring • Hard starting (long cranking time) • Reduced engine power and fuel economy

Q: How do you fix fault code P0349?

STEP 1: Inspect the sensor connector (Bank 2) for oil contamination, corrosion, or pushed-out pins. Clean with contact cleaner. STEP 2: Verify battery health and voltage. Camshaft signals are sensitive to voltage drops during cranking (min 12.6V static). STEP 3: Measure reference voltage (usually 5V or 12V) and ground at the sensor plug using a multimeter. STEP 4: Use an oscilloscope to monitor the signal waveform (Square wave). Wiggle the wiring harness during testing to identify intermittent circuit breaks. STEP 5: Visually inspect the reluctor wheel for damage or debris. Replace the sensor if the signal is erratic despite stable power and ground.

Last updated:1 February 2026

Related:Camshaft Position Sensor (CMP), Wiring Harness, Crankshaft Position Sensor (CKP), Engine Control Module (ECM/PCM), VVT Solenoid

System

Powertrain (Engine & Gearbox)

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Random or Multiple Cylinder Misfire Detected

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P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

Diagnostic Trouble Code (DTC) P0349 is defined as Camshaft Position Sensor 'A' Circuit Intermittent (Bank 2). This code triggers when the Powertrain Control Module (PCM) detects an inconsistent or erratic signal from the camshaft position sensor on engine bank 2. The sensor typically uses a Hall-effect principle to monitor the camshaft's rotational position for fuel injection timing and variable valve timing (VVT) control. The 'intermittent' nature of this code suggests the circuit is losing continuity or experiencing signal noise periodically, causing synchronization issues between the crankshaft and camshaft. This often leads to the PCM disabling VVT and entering a fail-safe or Limp Mode.

Possible Causes

Damaged or oxidized wiring harness/connector

Faulty Camshaft Position Sensor (internal intermittent failure)

Reluctor wheel/tone ring issues (loose or damaged)

Low battery voltage or starter motor interference (EMI)

Faulty Engine Control Module (PCM/ECU)

Symptoms

Check Engine Light (MIL) illuminated

Engine hesitation during acceleration

Rough idling or misfiring

Hard starting (long cranking time)

Reduced engine power and fuel economy

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P0349 - Camshaft Position Sensor A Circuit Intermittent (Bank 2)

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P0349 - Camshaft Position Sensor A Circuit Intermittent (Bank 2)

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