P30D5 Code – NOx Sensor 3 Signal Message Counter Incorrect

What does ODBII Code P30D5 Mean?

Powertrain Control Module(PCM), Engne Control Module(ECM) or Engine Control Unit (ECU) is receiving an incorrect NOx sensor signal.

Code P30D5 Possible Causes

  • Faulty NOx Sensor 3
  • NOx Sensor 3 circuit poor electrical connection
  • NOx Sensor 3 harness is open or shorted
  • Faulty Powertrain Control Module
  • Low battery voltage

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