Code
P0113
Generic
P — Powertrain
Intake Air Temperature Sensor 1 Circuit High Bank 1
Views:
UK: 38
EN: 94
RU: 115
AI status
Completed
Completed
100%
Causes
- Open or disconnected IAT sensor circuit (broken wire, unplugged connector)
- Short to battery voltage (5V reference) on the IAT signal wire
- Failed IAT sensor (thermistor out of range)
- Corroded or pushed-out connector pins
- Poor ground or reference voltage issue from ECM
- Aftermarket intake or recent service that disturbed harness or sensor
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light
- Engine runs rich or lean, poor fuel economy
- Hard cold start or rough idle when engine is cold
- Degraded driveability, hesitation or stalling in some cases
- Possible reduced performance or limp mode depending on strategy
What to check
- Read freeze frame and live IAT sensor data with a scan tool
- Perform visual inspection of IAT sensor and wiring harness for damage, corrosion, or disconnection
- Backprobe sensor connector and check reference voltage (usually ~5 V) with ignition on
- Check sensor signal voltage with engine off and at operating temperature (should vary with air temp)
- Measure IAT sensor resistance across terminals and compare to expected values for ambient temperature
- Wiggle harness and connector while monitoring live data for intermittent faults
Signal parameters
- System reference: typically 5 V reference, signal returned to ECM (varies by vehicle)
- Typical signal voltage at ~25°C: ~2.0–2.8 V (varies by sensor design)
- High-input trigger: voltage close to supply (e.g., >4.5 V) or open circuit
- IAT is an NTC thermistor: resistance decreases as temperature increases
- Typical resistance examples (approximate, sensor-dependent): ~2–3 kΩ at 20–25°C, several hundred ohms at high temps, very high/OL when open
Diagnostic algorithm
- Connect a scan tool and confirm P0113 is active; note freeze-frame data and live IAT reading.
- Visually inspect the IAT sensor, connector, and wiring for damage, corrosion, or disconnection near the intake and along the harness.
- With ignition ON (engine OFF), backprobe the connector: verify the 5 V reference and a good ground are present.
- Measure the sensor signal voltage with connector attached; if voltage is near supply (~5 V) suspect open or short to 5 V.
- Remove sensor and measure resistance across terminals. Compare to manufacturer chart or expected NTC behavior (resistance should decrease as sensor is warmed).
- If resistance is open or out of expected range, replace the IAT sensor and retest.
- If sensor resistance is OK but signal is high, inspect wiring for short to battery/5V. Repair damaged wiring or connector pins.
- Check continuity to ECM and confirm no short to power. Repair wiring harness as needed.
- After repairs, clear codes, then retest drive cycle and monitor live IAT data for correct behavior and absence of code.
- If wiring and sensor check good and code persists, consider ECM fault testing or replacement per manufacturer procedures.
Likely causes
- Disconnected or damaged IAT harness connector at the sensor
- Wiring short to 5V or supply rail due to chafing
- IAT sensor failed (open circuit or internal fault)
- Corroded terminal or pin in the sensor connector
- Faulty ECM or poor ground at control module
Fault status
Status
ECM detected a high-voltage or open condition on Intake Air Temperature (IAT) Sensor 1 circuit for bank 1 (P0113). Immediate actions: inspect sensor connector and wiring for open or short, verify 5 V reference and ground, test sensor resistance, repair or replace faulty component(s), then clear the code and verify.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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