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P034A Powertrain

Crankshaft Position Sensor - Crankshaft Start Position Incorrect

At engine start the crankshaft position reported by the sensor does not match the calibrated start window — typically a wrong tone-wheel installation, sensor air gap, or PCM not synchronised after a relearn.

Affected components

  • Crankshaft position sensor
  • Flywheel

Common causes

  • High likelihood: Tone wheel misindexed or relearn pending

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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