P0114: The intake air temperature signal comes and goes
Intake air temperature (IAT) sensor circuit intermittent
Severity: Monitor
An intermittent intake air temperature signal is a sensor-circuit fault to fix when convenient; TroubleCodes.net lists no hazardous effects.
P0114 in short
P0114 means the intake air temperature sensor signal is intermittent: correct at times, then wrong. Check the sensor, its connector and wiring first. A contaminated sensor, a sensor touching metal, or rodent-chewed wiring can also set it. Unlike P0112 and P0113, the fault is not constant.
The intake air temperature (IAT) sensor reports how warm the incoming air is. P0114 is the intermittent version of the IAT circuit codes: the signal is correct periodically and then goes wrong.
TroubleCodes.net contrasts it with P0112 and P0113, which show a steady low or high voltage. For P0114 it lists a defective sensor, contamination from a poor air filter fit or PCV blow-by, a sensor touching metal, rodent damage on stored cars, and wiring, connection or computer faults.
It advises testing the sensor with an ohm meter against a temperature chart, then checking the circuit for 5 volts on one wire and 0 on the other. If the sensor responds normally to temperature but the code persists, suspect corrosion, an open circuit or a short to ground.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Wiring corrosion, open circuit or poor connection
Common general cause- Why it ranks here
- A signal that comes and goes fits an intermittent circuit problem, and the page points to wiring when the sensor tests normal.
- What would change this
- A wiring or connector fault found when the sensor tests normal raises it.
Cause 2: Defective intake air temperature sensor
Common general cause- Why it ranks here
- A defective sensor is the first cause listed.
- What would change this
- A sensor that fails the resistance check, or a reading that changes when it is unplugged, raises it.
Cause 3: Sensor contaminated or touching metal
Possible — needs testing- Why it ranks here
- Contamination from dirty air filter fit or PCV blow-by, and sensors touching metal surfaces, are listed.
- What would change this
- Oil or dirt on the sensor, or contact with metal, raises it.
Cause 4: Rodent damage on a stored vehicle
Possible — needs testing- Why it ranks here
- The page lists stored vehicles as prone to rodent wiring damage.
- What would change this
- Chewed wiring raises it.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Measure the sensor's resistance with an ohm meter and compare it with the temperature and resistance chart for your vehicle.
IfResistance is wrong for the temperature
It meansThe sensor is at fault.
IfThe sensor responds normally
It meansCheck the circuit.
Step 2: Check the circuit with the key on: one wire should show 5 volts and the other 0 volts.
IfVoltages are wrong or unsteady
It meansWiring or connection is at fault.
Points to: Wiring corrosion, open circuit or poor connection
IfVoltages are correct
It meansCompare scan-tool readings next.
Step 3: With a scan tool, compare the IAT reading with the sensor connected and unplugged.
IfThe reading changes
It meansThe sensor is suspect.
IfNo change
It meansA circuit problem is more likely.
Points to: Wiring corrosion, open circuit or poor connection
Symptoms
- Check engine light
How to fix
Step 1: Check the IAT sensor connector and visible wiring for corrosion, chafing or rodent damage.
Parts and cost context
- Intake air temperature (IAT) sensor:On many engines the sensor is part of the MAF sensor. Test the sensor and circuit before replacing it. Labour varies; get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
We don't have reviewed vehicle-specific evidence for P0114 yet. The causes and tests above apply across vehicles.
Related codes
All Air metering (MAF, MAP and intake air temperature) codes
P0114 questions
How is P0114 different from P0112 and P0113?
P0112 and P0113 show a steady low or high voltage. P0114 means the signal is correct only some of the time.
Sources and review
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error