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P034B Powertrain

Crankshaft Position Sensor - Crankshaft Direction Incorrect

The crankshaft is rotating in the wrong direction relative to the expected reference — typically only seen on stop-start systems where the engine briefly counter-rotates after shutdown.

Affected components

  • Crankshaft position sensor

Common causes

  • High likelihood: Stop-start residual reverse rotation

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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