P0113
UniversalIntake Air Temperature Circuit High Input
The engine computer has detected an intake-air-temperature signal voltage higher than expected. The IAT sensor helps the computer estimate incoming air temperature so it can adjust fuel delivery and other engine controls. This code describes a circuit reading, not proof that the sensor itself has failed; wiring, connections, or the sensor may be involved.
⚠️ Before You Begin (Safety First)
This fault alone usually does not require stopping immediately, but it may affect driveability or emissions. Stop in a safe place if the vehicle develops severe running problems, stalls, or becomes unsafe to control. Let hot engine parts cool before inspecting them.
Common Symptoms
- The check-engine light may be on, while the vehicle otherwise appears to run normally.
- Fuel economy, emissions, starting, or engine response may be affected if the computer is using an incorrect air-temperature reading.
- The engine may run unevenly or hesitate if the incorrect reading leads to unsuitable fuel or engine-control adjustments.
- There may be no noticeable symptoms; the code can be detected before the driver observes a change.
Common Causes
- An open, loose, corroded, or poorly connected IAT sensor connector or circuit can produce a high signal reading.
- Damaged wiring or a poor electrical connection may interrupt the sensor circuit or increase its resistance.
- The IAT sensor may have an internal fault that causes its signal to be outside the expected range.
- A problem elsewhere in the circuit or its connections may affect the reading; the code alone does not identify the failed part.
Diagnostic Steps
- Check the vehicle-specific service information to identify the IAT sensor and circuit before handling components; the sensor may be integrated with another part.
- With the ignition off and the engine cool, visually inspect accessible wiring and connectors for damage, looseness, corrosion, or contamination.
- If a scan tool is available, review the IAT reading and compare it with the surrounding conditions and other relevant temperature readings; use vehicle-specific guidance to judge plausibility.
- If the connector and wiring look intact but the reading remains implausible, avoid replacing parts by guesswork and arrange circuit testing using the correct vehicle wiring diagram.
When to Call a Professional
A technician can compare scan-tool IAT readings with conditions at the vehicle, then inspect the connector and wiring and test the sensor and circuit using the vehicle-specific wiring diagram and service information. Some vehicles combine the IAT sensor with another component, so confirm the circuit design before replacing parts.
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Commonly Asked Questions
Does P0113 prove the IAT sensor is faulty?
No. It indicates that the IAT circuit signal is higher than expected. A sensor fault is one possibility, but an open circuit, damaged wiring, or a poor connection can also cause the reading.
Does “high input” mean the intake air is too hot?
No. The description refers to the electrical signal being high, not necessarily to the actual air temperature. The computer may interpret the signal as an incorrect temperature depending on the vehicle's circuit design.
Can I drive with this code?
Often the vehicle remains driveable, but fuel control, emissions, or engine response may be affected. Stop if severe running problems make driving unsafe, and have the fault diagnosed.
Could the IAT sensor be part of another component?
Yes. On some vehicles it is integrated with another component. Check the vehicle-specific service information before looking for or replacing a separate sensor.
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