What is the P0114 code?
The P0114 trouble code is a generic powertrain (OBD-II) code that indicates an intermittent signal from the Intake Air Temperature (IAT) sensor circuit. The Powertrain Control Module (PCM) has detected abnormal and irregular variations in the signal sent by this sensor.
Role of the IAT sensor and symptoms
The IAT sensor is crucial for calculating the air-fuel ratio (typically 14:1) and ignition timing. Therefore, a malfunction can cause:
- Decreased engine performance (especially when cold)
- Hesitation or stumbling during acceleration
- Increased fuel consumption
- Irregular idle
- Illumination of the Malfunction Indicator Lamp (MIL)
Possible causes of the P0114 code
- Disconnected or corroded IAT sensor connector (most common cause)
- Damaged wiring, short circuit, or open circuit
- Faulty IAT sensor
- Problem with the Mass Air Flow (MAF) sensor if integrated
- Clogged air filter or damaged air duct
- Rare PCM failure
Diagnostic procedure
1. Preliminary check:
- Consult the manufacturer’s Technical Service Bulletins (TSBs).
- Visually inspect the connector, wiring, air filter, and intake duct.
2. Test with diagnostic tool:
- Using an OBD2 scanner, read the live data (PID) from the IAT sensor.
- Compare the displayed temperature with the actual ambient temperature using a thermometer.
- If the value is inconsistent or erratic, proceed with further tests.
3. Sensor electrical test:
- Use a digital multimeter to measure the sensor’s resistance (thermistor). Compare it with the manufacturer’s reference values (resistance generally decreases as temperature rises).
- Check for the presence of the reference voltage (5V) and ground at the connector.
4. Circuit verification:
- If the sensor appears functional, test for continuity and the absence of short circuits in the wires between the sensor and the PCM.
Repair and tips
Replace the IAT sensor if it is out of specifications. Clean or secure the connectors if necessary. After repair, clear the codes and perform a road test to verify that the fault does not reappear.
💡 Tip: If the air filter was recently changed, check that the IAT sensor connector was not forgotten!
Related codes
P0110, P0111, P0112, P0113, P0095, P0096, P0097, P0098, P0099
Need help diagnosing your vehicle? Consult a professional equipped with a suitable scanner for an accurate and risk-free diagnosis.