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P0127

Overview

Code

P0127

Code Type

P

Code Class

P0

System

Engine

Severity Level

Low

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0127 indicates that the intake air temperature is higher than the maximum expected value detected by the ECM

Symptoms

Check Engine Light illuminated; Reduced engine performance; Poor fuel economy

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Excessively high intake air temperature affects air density calculations and fuel delivery

Possible Causes

Faulty IAT sensor; Heat soak conditions; Intake system issues

Diagnostic Steps

1 Confirm the fault code; 2 Monitor live IAT readings; 3 Inspect intake system routing; 4 Compare readings to ambient temperature; 5 Replace the IAT sensor if necessary

Drive Safety Notes

Driving is usually safe, but engine performance may be reduced

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