P0114
Intake Air Temperature Circuit Intermittent
Powertrain Fuel and Air Metering IAT Sensor 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your engine's air temperature sensor is sending inconsistent signals to the computer, like a radio that keeps cutting in and out. The ECU can't reliably know how hot the incoming air is, which affects fuel mixture adjustments.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated intermittently
Poor fuel economy or hesitation during acceleration
Rough idle or occasional stumbling
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors voltage from the Intake Air Temperature (IAT) sensor, which uses a thermistor that changes resistance with air temperature. The ECU expects a smooth voltage signal between 0.2V–4.8V correlating to air temps of -40°C to 125°C. An intermittent fault occurs when the signal drops out, spikes unexpectedly, or fluctuates erratically.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
IAT Sensor Voltage 0.2V–4.8V (smooth, continuous) Signal dropout, noise spikes, or erratic jumps
Temperature Range -40°C to 125°C Readings outside range or rapid fluctuations
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
IAT Sensor Connector
Unplug the connector at the sensor and inspect for corrosion, moisture, or loose pins; clean with contact cleaner and reconnect firmly.
2
IAT Sensor Wiring Harness
Visually trace the wiring from sensor to ECU for pinches, cuts, or abrasion against hot engine parts; repair or reroute as needed.
3
Intake Air Temperature Sensor
Unbolt the sensor from the intake manifold or air intake tube and replace with a new OEM unit if cleaning does not resolve the intermittent signal.