P0113 Code - Intake Air Temperature Circuit High Input

What Does P0113 Mean?

The P0113 occurs when the PCM reads a high voltage signal in the IAT circuit.

On most cars the IAT is located in the air intake box. Look around the intake box for a cylindrical shaped object with a two wire lead.

If you don’t find two wires, the IAT may be integrated with the MAF sensor. The IAT can sometimes be found on the intake manifold or plenum.

IAT Wiring Diagram

The electrical circuit for the IAT is shown below:



The IAT is calibrated and outputs a voltage proportional to the air temperature. Higher temperatures cause the PCM to read higher voltages because the IAT’s internal resistance is reduced when heated.

See the IAT in depth article (P0112) for more background on the IAT sensor.

Note: Circuit High Input codes are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that “leak” current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a “high input” code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

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What are the common causes of P0113 ?

• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

What are the symptoms of P0113 ?

• Poor acceleration
• Cherry red hot catalytic converter
• Possible spark knock (detonation / pre-ignition)
• The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

How do you troubleshoot P0113 ?

The most common potential repairs for the P0103 code are as follows:

• Recheck code with a scanner. Reset the fault codes and perform a road test.
• If the P0103 code comes back, then follow the order of the test procedure.
• Inspect the electrical connector to ensure it is attached correctly. Disconnect it and then reinstall to ensure fresh and positive electrical connection.
• Carefully inspect for wiring being frayed, damaged or broken on the connector. Repair or replace as necessary before further testing.
• Check for vacuum leaks, loose hoses, bad fittings, and clamps on the intake, especially on older cars. Old components can get hard and crack.

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