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DTC P1398: Misfire Adaptive Numerator At Limit: Testing

  1. Turn ignition off. Disconnect CKP sensor connector. CKP sensor is mounted to left side of transmission bellhousing. CKP sensor connector is located on top of intake manifold, near firewall. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. If connector is okay, go to next step.
  2. Ensure ignition is off. Inspect CKP sensor for proper installation. Correct CKP sensor installation as necessary. If CKP sensor is properly installed, go to next step.
  3. Ensure ignition is off. Remove CKP sensor. Inspect flywheel/flexplate for damage or misalignment. Repair flywheel/flexplate as necessary. If flywheel is okay, go to next step.
  4. At this time, CKP sensor is assumed to be defective. Replace CKP sensor.
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