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P0340Cars & SUVs
Moderate

P0340 — Camshaft position (CMP) sensor circuit

The camshaft position sensor signal is missing or erratic. The ECM cannot sync injection and ignition correctly, leading to misfires or a no-start.

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Likely causes

  • Faulty CMP sensor or incorrect air gap
  • Timing belt or chain jumped or worn
  • Damaged sensor harness or connector

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Recommended checks

  1. 1

    Verify the CMP sensor signal with a scope

  2. 2

    Inspect the timing belt/chain and timing marks

  3. 3

    Replace the CMP sensor if the signal is missing

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Parts to replace