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P0127 - Intake Air Temperature (IAT) Too High

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P0127 - INTAKE AIR TEMPERATURE (IAT) TOO HIGH

Description:  This DTC sets when the intake air temperature 2 (IAT2) sensor has detected a concern in the charge air cooler (CAC) system.
Possible Causes: 
  • Blockage of heat exchangers
  • Low fluid level
  • Fluid leakage
  • CAC pump or relay failure
  • Crossed CAC coolant lines
Diagnostic Aids:  Monitor the IAT2 PID. A typical IAT2 temperature should be greater than the IAT temperature.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST DU: INTAKE AIR TEMPERATURE 2 (IAT2) SENSOR .
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