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CarQuestionGuy, Technician
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Experience:  ASE Master Auto Technician for 5 years, ASE Refrigerant Handler, ASA, iATN
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Here is a description of the code and the possbile fixes. Let me know if you need anything else.

The inlet air temperature (IAT) sensor circuit voltage at the PCM goes above 4.9 volts for 5 seconds .

  • IAT sensor voltage above 4.6 Volts
  • (K21) IAT sensor signal circuit shorted to battery voltage
  • IAT sensor internal failure
  • (K21) IAT sensor signal circuit open
  • (K900) sensor ground circuit open
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