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P codepowertrainMedium severity

P0346Camshaft Position Sensor "A" Circuit Range/Performance (Bank 2)

The bank 2 camshaft position sensor "A" signal is present but implausible compared with what the PCM expects.

Definition

The PCM compares the bank 2 camshaft position sensor "A" signal against the crankshaft position signal to verify cam/crank synchronization for sequential fuel injection, spark timing, and variable valve timing control. P0346 sets when the cam signal is electrically present but the pulse count, pattern, or cam-to-crank correlation is out of the expected range. Symptoms include hard or extended-crank starts, rough running, stalling, reduced power, and an illuminated MIL; on VVT engines the PCM typically locks cam phasing to a default position, and persistent correlation errors can indicate timing chain problems that will worsen if ignored.

Common causes

  • Stretched timing chain or jumped tooth altering cam-to-crank correlation on bank 2
  • Damaged, dirty, or incorrectly installed cam sensor reluctor/tone wheel
  • Failing camshaft position sensor producing a distorted signal
  • Cam phaser stuck or slow due to sludge or low oil pressure (VVT engines)
  • Wiring damage causing signal distortion or dropout
  • Excessive metal debris on a magnetic sensor tip

Common misdiagnoses

  • Replacing the cam sensor when the timing chain is stretched
  • Replacing the crank sensor
  • Replacing the cam phaser/VVT solenoid when low oil level or wrong-viscosity oil is the cause
  • Replacing the PCM

Troubleshooting steps

  1. 1.Check oil level, condition, and viscosity first

    On VVT engines, low or degraded oil is the most common root cause of cam correlation faults — correct it before replacing parts.

  2. 2.Scan for companion codes

    Cam/crank correlation codes (e.g., P0016-P0019) or bank 1 cam codes alongside P0346 shift suspicion from the sensor to the timing set or phasers.

  3. 3.Inspect the sensor and reluctor

    Remove the bank 2 cam sensor and check the tip for metal debris and the tone wheel for damage or a sheared locating pin where visible.

  4. 4.Scope cam and crank signals together

    Capture both waveforms and compare the cam edge alignment against a known-good pattern for the engine; a shifted pattern indicates mechanical timing error, while a ragged signal indicates the sensor or reluctor.

  5. 5.Check VVT operation with a bidirectional scan tool

    Command bank 2 cam phasing and confirm actual position follows the target; a lazy or stuck response points to the phaser or oil control valve.

  6. 6.Verify mechanical timing if the pattern is shifted

    Check timing marks or chain stretch per service procedure before condemning any electrical component.

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