P0113 Intake Air Temperature Sensor 1 Circuit High

P0113 points to a high intake-air-temperature sensor circuit reading. On many systems that means the module sees an implausibly cold input from an open or high-resistance circuit.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not chase mixture problems before confirming the temperature input is believable; a false IAT value can affect fueling and timing strategy.

Symptoms of P0113

Check-engine light.
Occasionally hard starting or slightly rough running.
Usually little change in drivability.

Common causes of P0113

A failed intake-air-temperature (IAT) sensor.
An open circuit or bad connector at the sensor.
A combined MAF/IAT sensor fault.
Corroded or damaged wiring.

Useful checks before replacing parts

Compare intake-air temperature to ambient temperature after the vehicle has sat long enough to cool down.
Inspect the IAT connector, shared MAF/IAT wiring, sensor ground, and harness damage near the airbox.
Watch live IAT data while moving the harness to expose intermittent opens or connection faults.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.