P0113 means the intake air temperature (IAT) sensor’s circuit is reading a voltage the ECU interprets as unrealistically high — which almost always means an open circuit (a break, disconnection, or corroded connector) rather than the sensor genuinely detecting very hot air. This sensor, often built into the mass airflow sensor housing on many vehicles, helps the ECU fine-tune fuel delivery based on air density, and a fault here typically causes a mild efficiency issue rather than a serious drivability problem.
What Does P0113 Mean?
The intake air temperature sensor measures how hot or cold incoming air is, since colder air is denser and requires more fuel for the same air-fuel ratio compared with warmer, less dense air. The ECU uses this reading alongside the mass airflow sensor — the two are combined into a single unit on many vehicles — to fine-tune fuel delivery for changing conditions.
“High input” specifically means the voltage on this circuit is higher than any temperature the sensor should physically be able to report — in practice, this pattern is the signature of an open circuit rather than a real reading, since a disconnected sensor or broken wire typically causes the voltage to float toward one extreme rather than reporting a false-but-plausible value.
Common Symptoms
- Check engine light on, often the only noticeable symptom.
- Slightly rough cold starts, since the ECU may apply an incorrect fuel adjustment based on a default or fallback air temperature assumption.
- Minor reduction in fuel economy.
- No noticeable symptom at all in many cases, since this sensor’s influence on overall fuel delivery is relatively modest compared with the primary airflow measurement.
Common Causes, Most Likely First
- A disconnected or poorly seated connector at the sensor, particularly if it’s integrated into the MAF sensor housing and was recently removed for cleaning or inspection.
- Damaged or broken wiring in the sensor’s circuit.
- A corroded connector, especially on vehicles exposed to road salt or high humidity.
- A failed sensor itself, less common than a wiring or connector issue for this specific “high input” pattern.
How to Diagnose It
- Check the connector first — if this sensor shares a housing with the MAF sensor and either was recently serviced, confirm the connector clicked fully into place.
- Inspect wiring for visible damage along the full length of the harness.
- Test sensor resistance at different temperatures against manufacturer specification if the connector and wiring check out fine.
- Check for corrosion at the connector pins specifically, since this can cause exactly this kind of high-reading fault without an obvious visible break.
Never work under a vehicle supported only by a jack. Use axle stands on firm, level ground, chock the wheels that stay down, and leave the car in gear or Park with the handbrake on. A jack lifts; stands hold.
Possible Fixes
| Cause | Fix | Typical cost |
|---|---|---|
| Disconnected/loose connector | Reseat the connector | $0 |
| Corroded connector | Clean or replace the connector | $20 – $80 |
| Damaged wiring | Repair the affected section | $50 – $150 |
| Failed sensor | Replace the sensor (or MAF/IAT combined unit) | $100 – $250 |
Can I Drive With P0113?
Yes, without much concern — this typically causes at most a mild fuel efficiency or cold-start smoothness issue rather than anything affecting safety or serious drivability. Worth fixing when convenient rather than urgently.
When to See a Mechanic
Not urgent, though worth checking the connector yourself first, since that resolves a meaningful share of these cases at no cost. More in our trouble codes section.
Frequently Asked Questions
What does P0113 mean?
The intake air temperature sensor’s circuit is reading a voltage the ECU interprets as unrealistically high, which almost always indicates an open circuit — a disconnected or broken connection — rather than genuinely hot intake air.
Is the intake air temperature sensor the same as the MAF sensor?
They’re often combined into a single physical unit on many vehicles, though they measure different things — air temperature versus airflow volume — and can each set separate, independent trouble codes.
Can a loose connector cause P0113?
Yes, very commonly, especially if the sensor shares a housing with the MAF sensor and was recently removed for cleaning — check that the connector clicked fully back into place.
Is it safe to drive with a P0113 code?
Yes, generally — it typically causes at most a mild fuel efficiency or cold-start smoothness effect rather than any safety or serious drivability concern.
How much does it cost to fix P0113?
Often free if it’s just a loose connector, up to $250 if the sensor itself needs replacing.
