Intake Air Temperature (IAT) Sensor 1 Circuit High Input
Code P0113 indicates that the engine control module detected maximum 5.0V signal voltage from the Intake Air Temperature (IAT) sensor. Because the IAT is a negative temperature coefficient (NTC) thermistor, high voltage corresponds to an open circuit (unplugged sensor, broken wire, or open internal thermistor).
Inspect the multi-pin connector on your Mass Air Flow (MAF) sensor or standalone IAT sensor. In 90% of cases, the wiring clip was left unplugged after an air filter change, or the ground wire severed.
Interactive Symptom Pinpoint Troubleshooter
Answer 2 diagnostic tests to isolate the exact component failure for P0113.
Does live scanner data show IAT temperature reading as -40°F (-40°C)?
Live Scanner & Multimeter Benchmark Values
Compare your live OBD-II PID sensor data against OEM factory operating specs for P0113.
| Monitored Parameter / Sensor PID | Healthy OEM Operating Range | Fault Threshold (Triggers P0113) |
|---|---|---|
| IAT Sensor Signal Voltage (Key On, 70°F ambient) | 2.2V – 3.2V | 4.9V – 5.0V (indicates open circuit / unplugged connector) |
| IAT Thermistor Resistance (at 68°F / 20°C) | 2,000 – 3,000 Ohms (2k – 3kΩ) | OL (Open Loop) confirms severed internal thermistor |
| IAT Scanner Live Data Reading | Matches outside air temp (e.g. 72°F) | -40°F (-40°C) confirms open circuit |
Symptoms Associated with P0113
Drivers typically observe the following symptoms when the ECM flags P0113:
Common Root Causes & Statistical Probability Matrix
Statistical breakdown of what triggers this code based on automotive repair shop data.
Step-by-Step Diagnostic & Repair Procedure
Follow this logical order to isolate and repair P0113 before spending money on costly parts.
Step 1: Verify Sensor Plug Connection
Check that IAT/MAF connector is firmly plugged in and wires are intact.
Step 2: Check Live Data
Read IAT PID on scanner. If -40°F, bridge signal and ground pins with a paperclip: reading should jump to ~300°F.
Step 3: Measure Sensor Resistance
Measure resistance across sensor pins with multimeter. Should read 2k-3k Ohms at room temp.
Vehicle-Specific Failure Trends & Technical Bulletins
Real workshop failure patterns reported by mechanics across popular makes and models for P0113.
Honda Civic / CR-V / Accord
Ford Mustang / F-150
Dave Miller, ASE Master Tech
ASE L1 Certified Master ReviewerASE Certified Master Automobile Technician (A1-A8) & L1 Advanced Engine Performance • 24 years automotive diagnostic experience
“Always verify sensor voltages and harness grounds before purchasing replacement electronic components.”