P0127 OBD II Trouble Code Intake Air Temperature Too High

Symptoms of P0127 OBD II Trouble Code

  • Hesitation or surge at idle or upon light acceleration
  • Diminished fuel efficiency
  • Decreased engine performance (especially on cold start)
  • Other drivability codes may also be stored

Common Causes of P0127 OBD II Trouble Code

  • IAT sensor harness has been left unplugged
  • Open or shorted IAT sensor wiring and/or connectors
  • Defective IAT sensor
  • Faulty MAF sensor
  • Clogged air filter
  • Broken intake air inlet pipe

Severity of P0127 OBD II Trouble Code

The IAT sensor signal is used by the PCM to calculate fuel delivery strategy, therefore a code P0127 should be considered severe. Symptoms of a P0127 code may include: