P0113 - Intake Air Temperature Circuit High Input
P0113 means the intake air temperature signal is reading colder than expected because the circuit is open or the signal is stuck high. It is not automatically just a bad IAT sensor; an unplugged sensor, damaged wiring, connector corrosion, open circuit, failed sensor, integrated MAF/IAT assembly issue, or intake setup problem can overlap with the same airflow symptoms.
Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.
Code Overview
P0113 means the intake air temperature signal is reading colder than expected because the circuit is open or the signal is stuck high. It is not automatically just a bad IAT sensor; an unplugged sensor, damaged wiring, connector corrosion, open circuit, failed sensor, integrated MAF/IAT assembly issue, or intake setup problem can overlap with the same airflow symptoms.
Common Causes
- Toyota Camry: dirty MAF sensors, cracked intake boots, loose air-box seals, and intake leaks after the MAF are common airflow-code starting points.
- Ford F-150: cracked intake tubes, contaminated MAF sensors, loose clamps, and unmetered air after the MAF are frequent P0101/P0113 causes.
- Chevy Silverado: vacuum leaks, intake duct leaks, and MAF contamination from oiled aftermarket filters are common airflow and IAT fault triggers.
- Honda Accord: intake leaks, damaged sensor connectors, and MAF/IAT harness issues often trigger airflow or intake-temperature codes.
Symptoms
- Check-engine light with little drivability change
- Cold-start fueling may feel off
- Fuel economy can drop if the reading stays inaccurate
Diagnostic Steps
- If P0101 appears with P0171 or P0174, inspect for unmetered air after the MAF before replacing the MAF sensor.
- If high idle appears with positive fuel trims, inspect intake boots, vacuum hoses, PCV plumbing, and throttle-body gasket areas for leaks.
- If unplugging the MAF improves idle quality, compare MAF readings and connector integrity because the airflow signal may be biased.
- If MAF grams per second is unusually low at hot idle, inspect for sensor contamination, airflow restriction, dirty sensing wires, or intake duct problems.
- If P0113 appears with cold-start issues, inspect the IAT connector, signal wiring, reference behavior, and sensor voltage before replacing parts.
- If the IAT reading is stuck extremely cold, inspect for an open circuit, unplugged sensor, poor terminal fit, or integrated MAF/IAT assembly fault.
Diagnostic Insight
P0113 should be diagnosed as an intake-temperature circuit-high fault first, then cross-checked against MAF data, fuel trims, intake sealing, and fuel delivery when lean or hesitation symptoms are present.
- A cold-looking IAT reading on a warm intake usually points to an open circuit, unplugged sensor, poor terminal fit, or signal circuit problem.
- Cold-start issues with P0113 should push connector, wiring, and sensor-voltage checks ahead of replacing the MAF or IAT assembly.
- If P0113 appears with P0101, P0171, or P0174, confirm whether the IAT is integrated into the MAF and smoke test for post-MAF leaks before replacing the assembly.
- Positive trims that are worse at idle point toward intake, vacuum, or PCV leaks, while trims that worsen under load move the diagnosis toward fuel pressure and delivery.
- Hesitation or P0300 with P0113 should be separated into airflow, lean misfire, fuel delivery, and ignition paths before parts are priced.
- Air-filter restriction, oiled aftermarket filters, loose intake tubes, or poor air-box sealing can skew MAF/IAT behavior and should be inspected before sensor replacement.
Repair Difficulty
Easy
General difficulty estimate for the most common repair path.
Likely Repairs & Cost Guides
Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.
Price this only after scan data, connector checks, and voltage testing prove a false IAT signal instead of a shared MAF/IAT or intake issue.
Start here when the IAT reading is stuck cold or high-input behavior points to an open circuit, poor terminal fit, or wiring fault.
Use this when the IAT is integrated with the MAF and P0101, P0171, or P0174 data suggests a shared airflow problem.
Use this when lean trims or idle symptoms suggest unmetered air after the MAF before replacing intake temperature parts.
Use this when a dirty filter, intake restriction, oiled aftermarket filter, or intake tube issue may skew MAF/IAT readings.
Move here when trims worsen under load and weak fuel delivery may be mimicking airflow or temperature-sensor symptoms.
Related OBD Codes
Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.
Next Steps
Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.