P0113 medium Severity

P0113: Intake Air Temperature (IAT) Sensor 1 Circuit High Input

May cause incorrect air‑fuel mixture resulting in rough idle, poor fuel economy, and reduced performance; vehicle often still drivable but not optimal.

Overview

P0113 indicates that the IAT sensor circuit is reporting a voltage above expected range (high input), often due to sensor or wiring fault, leading to incorrect air temperature readings and impacting air‑fuel mixture management.

Common Symptoms

  • Check Engine Light illuminated
  • Poor fuel economy
  • Rough idle or hesitation
  • Difficulty starting or inconsistent engine performance

Most Common Causes

Faulty Intake Air Temperature (IAT) sensor high

Sensor may be internally failed or stuck at high resistance leading to high voltage signal.

Wiring or connector issues (open circuit, corrosion, short to voltage) high

Damaged, corroded, or loose wiring/connectors to IAT sensor often triggers high input signal.

Integrated MAF/IAT sensor failure medium

In vehicles with IAT built into MAF, failure of MAF assembly can present P0113.

Faulty PCM/ECM low

Rare cause; PCM may incorrectly interpret signal or lose reference voltage.

Diagnostic Steps

  1. Connect OBD‑II scan tool and confirm P0113 code; observe live IAT sensor voltage and temperature readings.
    Expected: IAT voltage above normal range or unrealistic temperature reading compared to ambient.
    Interpretation: High input confirms the circuit issue; proceed to inspect sensor/wiring.
  2. Visually inspect IAT sensor, connector, and wiring for damage, corrosion, or loose connections.
    Expected: Clean, secure connectors with intact wiring.
    Interpretation: Any damaged or corroded components should be repaired or replaced.
  3. Use a multimeter to check reference voltage at sensor harness (approx ~5V) and continuity/ground.
    Expected: Stable 5V reference and good ground continuity.
    Interpretation: Missing voltage or ground indicates wiring/PCM issue.
  4. Test IAT sensor resistance vs. temperature with heat source and compare to spec.
    Expected: Resistance decreases with rising temperature.
    Interpretation: If sensor shows open circuit or incorrect resistance, replace sensor.
  5. After repairs, clear codes and test drive to confirm code does not return.
    Expected: Code remains cleared and IAT readings reflect ambient conditions.
    Interpretation: Successful repair verified.

Repair Solutions

Replace IAT sensor easy
Estimated Cost: $15 - $120

Common fix when sensor fails; cost varies if integrated with MAF assembly.

Repair/replace damaged wiring or connectors medium
Estimated Cost: $20 - $150

Includes cleaning corrosion, soldering, or replacing harness sections.

Replace MAF/IAT assembly (if integrated) medium
Estimated Cost: $80 - $350

Often required on vehicles where IAT is built into MAF sensor.

PCM/ECM repair or reprogramming hard
Estimated Cost: $800 - $1200

Rare; only if all wiring/sensor tests are good and faults persist.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming air filter or unrelated engine issue is primary cause without testing IAT circuit

Frequently Asked Questions

Can you explain the meaning of P0113?

When your OBD-II scanner reads P0113, it means: Intake Air Temperature (IAT) Sensor 1 Circuit High Input. This code is related to the vehicle's Air Intake.

Reflecting on severity: How bad is P0113?

You should treat P0113 as a medium issue. May cause incorrect air‑fuel mixture resulting in rough idle, poor fuel economy, and reduced performance; vehicle often still drivable but not optimal.

What happens when the P0113 code is active?

Common symptoms include: Check Engine Light illuminated, Poor fuel economy, Rough idle or hesitation. You might also notice the Check Engine Light is on.

Common triggers for the P0113 error

Potential culprits include: Faulty Intake Air Temperature (IAT) sensor, Wiring or connector issues (open circuit, corrosion, short to voltage), Integrated MAF/IAT sensor failure. A proper diagnosis is recommended.

Repair cost breakdown for P0113

The cost varies significantly based on the root cause. For example, replacing a Replace IAT sensor typically costs between $15 and $120, while fixing a PCM/ECM repair or reprogramming can range from $800 to $1200.

Does code P0113 apply to Honda vehicles?

P0113 is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

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