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Intake Air Temperature Circuit Low Input

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What P0112 means

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The control unit reports “Intake Air Temperature Circuit Low Input”. Code P0112 identifies the area to investigate, but it does not prove that one named part has failed without a confirming test and vehicle context.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

When a warning involves the intake air temperature sensor, the order of checks matters more than the parts list.

What this code does not prove

This code describes a system observation about the intake air temperature sensor, not a verdict that one named part has failed. The same code can have more than one cause, so the paths must be separated by testing.

Where the diagnosis usually goes next

Check the signal at its source

Code P0112 describes a condition in the intake air temperature sensor: the signal reads at or near the bottom of its expected electrical range. That names where to look, but it does not by itself confirm which part has failed.

How to tell the paths apart: Read the live data and compare it against the expected range for current conditions before replacing anything.

Rule out wiring and the connector

Codes of this shape often come from damaged wiring, a corroded connector, or a poor ground on the intake air temperature sensor — not the component itself.

How to tell the paths apart: Inspect the wiring and connector for the intake air temperature sensor for damage and a secure ground before replacing anything.

Before you drive on

A code about the intake air temperature sensor alone cannot give a universal verdict for this specific vehicle. If the car is running normally, limit use to what is needed for diagnosis; any change in behaviour changes the decision.

Stop and arrange a check if

  • the engine is misfiring, losing power, or stalling
  • smoke, a fuel/burning smell, or overheating appears
  • the intake air temperature sensor's behaviour is clearly getting worse rather than staying stable

Before authorising a repair

  • Bring the complete code list and freeze-frame data relevant to the intake air temperature sensor
  • Ask for the test that confirms a fault in the intake air temperature sensor — not just the code alone

What to check first

  1. Read live data for the intake air temperature sensor and compare it against the expected range for current engine conditions.
  2. Inspect the wiring, connector, and ground for the intake air temperature sensor before replacing the component.
  3. An intake air temperature sensor should read close to ambient temperature after the vehicle has sat for a while (a cold soak) and rise once the engine has been running and under-hood temperatures climb. A reading permanently pinned at one extreme, or one that never changes between a cold soak and a warmed-up engine, points to the sensor or its wiring rather than an actual thermal condition — comparing the cold-soak reading against a thermometer is a reliable first check.
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Frequently asked questions

Does this code tell me the intake air temperature sensor has failed?

No. It points to the intake air temperature sensor; the cause still needs to be confirmed by a measurement or targeted test.

What should I bring to the workshop?

The complete code list, freeze-frame data, and the conditions around the intake air temperature sensor — that gives the technician context, not a guess.

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