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P0451 - Evaporative Emission System Pressure Sensor/Switch Range/Performance
This DTC sets when a fuel tank pressure (FTP) sensor range (offset) concern is detected. The FTP sensor output is offset by greater than 1.7 inches of water or less than -1.7 inches of water.
Possible Causes:
  • Intermittent open in the FTP sensor
  • Intermittent short in the FTP sensor
  • Intermittent open FTP circuit
  • Intermittent short FTP circuit
  • Contaminated FTP sensor
  • Damaged FTP sensor
  • Damaged PCM

I am sure the dealer will fix it just fine.

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