The P0111 code occurs when the powertrain control module (PCM) thinks the signal from the intake air temperature (IAT) sensor is outside its normal operating range.

CAUSES:

• Faulty Intake Air Temperature (IAT) sensor
• Dirty air filter
• Intake Air Temperature (IAT) sensor harness is open or shorted
• Intake Air Temperature (IAT) sensor circuit poor electrical connection

SYMPTOMS:

• Check engine light
• Bad fuel mileage
• Poor performance

DIAGNOSE AND REPAIR:

• Diagnosing this code can be cumbersome. Try to record the sensor information while idling. Take the car for a test drive, and have a passenger record the sensor information during engine load. The sensors voltage should rise and fall roughly with the engines RPMs.
• During Key On Engine Off, the reference voltage should be a steady 5V.

NOTE: This information is not intended as repair advice and we are not responsible for any actions you take on any vehicle.

The P0111 code occurs when the powertrain control module (PCM) thinks the signal from the intake air temperature (IAT) sensor is outside its normal operating range.

CAUSES:

• Faulty Intake Air Temperature (IAT) sensor
• Dirty air filter
• Intake Air Temperature (IAT) sensor harness is open or shorted
• Intake Air Temperature (IAT) sensor circuit poor electrical connection

SYMPTOMS:

• Check engine light
• Bad fuel mileage
• Poor performance

DIAGNOSE AND REPAIR:

• Diagnosing this code can be cumbersome. Try to record the sensor information while idling. Take the car for a test drive, and have a passenger record the sensor information during engine load. The sensors voltage should rise and fall roughly with the engines RPMs.
• During Key On Engine Off, the reference voltage should be a steady 5V.

NOTE: This information is not intended as repair advice and we are not responsible for any actions you take on any vehicle.