P0113 OBD-II Trouble Code: IAT Sensor Circuit High Input Problem

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Cost of diagnosing the P0113 code

P0113 is a diagnostic trouble code (DTC) for "IAT Sensor Circuit High Input Problem". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P0112 code definition

Intake Air Temperature (IAT) sensor circuit high input problem

What the P0112 code means

P0112 is the OBD-II generic code that the engine control module (ECM) has recorded the IAT sensor output above expected sensor range.

What causes the P0112 code?

If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open circuit in the IAT sensor circuit, and sets trouble code P0112.

What are the symptoms of the P0112 code?

  • The ECM will turn on the Check Engine Light and go into a failsafe mode.
  • Engine may not start as usual
  • Engine may run extra lean
  • Engine may have pre-ignition problems from lean burn conditions

Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.

How does a mechanic diagnose the P0112 code?

  • Scans the ECM, documents the codes received, and views the freeze frame data to see the conditions present when the code was set

  • Clears the vehicle of fault codes and the retests the vehicle to see if the code comes back

  • Performs a visual inspection to check for shorting harness or connector to sensor

  • Observes the sensor’s live data on the scanner while disconnecting the IAT sensor connector to see if the sensor reading goes to -40°F indicating the sensor is shorted

If the sensor is disconnected and input is still 240°F then the short is in the connector or harness.

If no problems are noted, the mechanic performs the manufacturer's specific pinpoint tests for the code and repair as needed.

Common mistakes when diagnosing the P0112 code

  • Not performing a visual inspection of connections and wiring

  • Not following the manufacturer pinpoint test procedure step-by-step and skipping steps

  • Not replacing an IAT sensor only when tests indicate a problem

  • Not connecting a new or known good sensor to the harness and viewing the ECM data to see if the temperature output from the sensor is as expected

How serious is the P0112 code?

  • The P0112 code will cause the engine ECM to go into a failsafe mode.

  • The failsafe mode, depending on the manufacturer failsafe mode strategy, may cause lean condition drivability symptoms.

  • Driving the vehicle for an extended time running too lean can cause internal engine problems with rings and valves.

What repairs can fix the P0112 code?

  • Repairing or replacing the IAT connector short
  • Repairing or replacing the wiring short as necessary
  • Replacing the IAT with a new sensor

Additional comments for consideration regarding the P0112 code

  • The P0112 code is often associated with P0111, P0112, and P0114 codes.

  • Most intake air temperature sensor problems for code P0112 are failures from damaged shorted harnesses or from sensors shorted internally to power.

Need help with a P0112 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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P0113

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