Engine-Codes - Generic - P1112

P1112 Code - Intake Air Temperature Sensor Intermittent

- Code Popularity: 38,162 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1112?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Intake Air Temperature Sensor
  • Intake Air Temperature Sensor harness is open or shorted
  • Intake Air Temperature Sensor circuit poor electrical connection
  • Damaged Powertrain Control Module (PCM)

Code Tech Notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor. Monitor the IAT on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the sensor is tapped.

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How to Fix the DTC P1112?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1112 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1112 Code Mean?

The IAT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and air flow.
The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.
Currently there are 2 types of IAT sensors used, a stand alone, non-integrated type and an integrated type. Both types function the same, however the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand-alone sensor.
P1112 Code - Intake Air Temperature Sensor Intermittent

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Code P1112 Information for Specific Makes

  • P1112 Acura Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Audi HO2S Control Bank 1 System Too Rich
  • P1112 BMW Engine Coolant Temperature Radiator Outlet Sensor High Input
  • P1112 Buick Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Cadillac Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Chevrolet Intake Air Temperature Sensor Circuit Intermittent Low Voltage  
  • P1112 Chrysler Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Dodge Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Ford Intake Air Temperature Sensor Intermittent Condition
  • P1112 GMC Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Honda Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Hyundai Manifold Differential Pressure Sensor
  • P1112 Isuzu Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Jeep Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 KIA Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Lincoln Intake Air Temperature Sensor Intermittent Condition
  • P1112 Mazda Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Mercury Intake Air Temperature Sensor Intermittent Condition
  • P1112 MINI Engine Coolant Temperature Radiator Outlet Sensor High Input
  • P1112 Pontiac Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Saturn Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Subaru Atmospheric pressure sensor range/performance problem
  • P1112 Suzuki Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 Volkswagen HO2S Control Bank 1 System Too Rich
  • P1112 Volvo Outside Temperature Sensor Signal Too Low Or Too High

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