P0114
Intake Air Temperature Circuit Intermittent
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The P0114 code indicates that the Intake Air Temperature (IAT) sensor circuit has an intermittent fault — the sensor signal drops out, spikes, or becomes erratic occasionally rather than failing consistently. This code typically appears when the ECM logs rapid or unexpected changes in the IAT signal that don't correspond to any actual change in air temperature. The Check Engine Light may come on and go off, sometimes clearing itself temporarily.
Intermittent electrical faults are almost always caused by connection problems rather than sensor failure. The IAT sensor connector is the most likely culprit — over time, the connector retention clips can weaken, vibration from the engine works the connector slightly loose, and small amounts of corrosion build up on the pins. This creates a connection that works most of the time but momentarily loses contact during bumps or engine vibration. Inspect the connector carefully, clean any corrosion with electrical contact cleaner, and make sure it clicks firmly into place.
This is a low-severity code with minimal impact on driveability. Most drivers will barely notice any symptoms, as the ECM quickly substitutes a default value whenever the signal drops out. However, if you need to pass an emissions inspection, this code will need to be resolved since it can prevent the OBD readiness monitors from completing. The fix is usually as simple as cleaning the connector and applying dielectric grease, making this one of the easiest and cheapest OBD2 codes to address.
Severity
Symptoms
- •Check Engine Light comes on intermittently
- •Occasional slight hesitation on acceleration
- •Fuel economy fluctuates slightly
- •Sporadic rough idle when first starting
- •Engine performance subtly varies between drives
- •May intermittently fail emissions readiness checks
Likely Causes
The connector at the IAT sensor may be slightly loose or have worn retention clips, causing it to vibrate and make intermittent contact during driving.
Corrosion on the sensor pins or connector terminals creates a high-resistance contact that can intermittently open as temperature and vibration change.
A wire that is partially broken or has damaged insulation can make and break contact intermittently, especially during engine vibration or temperature changes.
The thermistor element inside the IAT sensor may have a hairline crack or connection that opens and closes with thermal expansion, causing sporadic signal dropouts.
A previous wiring repair using a poor-quality splice or butt connector can develop intermittent high resistance over time due to corrosion or vibration.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean and firmly reseat the IAT sensor connector
- Apply dielectric grease to connector pins to prevent corrosion
- Inspect and repair damaged wiring in the IAT circuit
- Replace the IAT sensor
- Check for and repair any poor-quality wiring splices in the circuit