The OBD2 code P0114 indicates an intermittent problem with the Circuit 1 of the Intake Air Temperature (IAT) Sensor. This error suggests that the sensor’s signal to the vehicle’s engine control module (ECM) is sporadically failing or fluctuating, leading to inaccurate air temperature readings.
These inaccuracies can result in various engine performance issues, such as rough idling, high RPMs, decreased fuel efficiency, or intermittent hesitation.
P0114 quick overview
| Meaning | P0114: Intake Air Temperature Sensor 1 Circuit Intermittent |
| Is it serious? | Yes, as intermittent issues can lead to unpredictable engine behavior and decreased performance. |
| Possible causes | – Loose or corroded IAT sensor connections – Broken or damaged wires in the IAT sensor circuit – Faulty IAT sensor – Problems with the vehicle’s ECM |
| How to diagnose? | Inspect the IAT sensor and its connector for loose connections or corrosion. Check the wiring for potential breaks, damage, or shorts. Test the voltage and ground at the IAT sensor to confirm proper electrical operation. Perform a smoke test to identify any air leaks in the intake system that could affect sensor readings. Ensure the ECM software is up-to-date and functioning correctly. |
P0114 Meaning
Imagine the IAT sensor as a thermometer that tells your car’s computer how to adjust the engine’s operation based on the air temperature. When the P0114 code pops up, it’s like this thermometer is giving random readings now and then, making the computer unsure how to adjust things properly.
This can make your car act up, like idling roughly or hesitating while you’re driving. Fixing this often involves checking the connections to make sure they’re tight and not rusty, or looking for any damaged wires that might be messing with the signal.
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How to fix P0114 – learn from mechanics
I looked into P0114 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Pontiac P0114
Vehicle Information 2001 Pontiac Grand Am GT 3.4L
Issue + Repair History
- Vehicle brought in with a high 3500rpm idle
- Check engine light on with code P0114
- Replaced throttle body, IAC motor, and IAT sensor
- Issue persists after replacements
Other OBD2 Codes + Test Results
- Error codes: P0114
- No other test results provided
Mechanic Suggestions
- Check for vacuum leaks and verify IAC counts
- Inspect wiring for potential breaks or shorts
- Ensure coolant temperature sensor is functioning properly
- Verify correct procedure for checking transmission fluid level
- Check connector and wiring integrity at the PCM
Final Fix
- Replaced the pigtail connector for the IAT sensor, which resolved the issue. The vehicle now runs fine and shifts smoothly.
Case #2: Toyota P0114
Vehicle Information 2012 Toyota Camry LE 2.5L
Issue + Repair History
- Customer complained of decreased fuel efficiency and rough idle
- Check engine light on with code P0114
- Previously replaced MAF sensor and air filter
- Issue persists after replacements
Other OBD2 Codes + Test Results
- Error codes: P0114
- Live data shows inconsistent IAT readings
- MAF sensor values within normal range
Mechanic Suggestions
- Inspect IAT sensor wiring and connector for damage or corrosion
- Check for any vacuum leaks in the intake system
- Verify proper grounding and voltage supply to the IAT sensor
- Perform a smoke test to detect any air leaks in the intake system
Final Fix
- Discovered a broken wire near the IAT sensor connector and repaired it. Reset the code and test drove the vehicle, confirming that the issue was resolved. The customer reported improved fuel efficiency and smoother engine operation.
Case #3: Chevrolet P0114
Vehicle Information 2015 Chevrolet Silverado 1500 LT 5.3L
Issue + Repair History
- Vehicle exhibited rough idle and intermittent hesitation
- Check engine light on with code P0114
- Previously replaced throttle body and cleaned MAF sensor
- Issue persists after previous repairs
Other OBD2 Codes + Test Results
- Error codes: P0114
- Live data shows fluctuating IAT readings
- MAF sensor values within acceptable range
Mechanic Suggestions
- Inspect IAT sensor connector for corrosion or loose connections
- Check for any damage to the intake air duct or filter
- Perform voltage drop test on IAT sensor circuit
- Ensure PCM software is up to date
Final Fix
- Discovered a loose connection at the IAT sensor connector, which was causing intermittent signal interruptions. Reconnected the connector securely and cleared the code. Test drove the vehicle and confirmed that the issue was resolved.
How to diagnose P0114
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Inspect IAT sensor and connector | Check for any signs of loose connections or corrosion that could interfere with sensor signal accuracy. |
| Check wiring for damage | Look for breaks, damage, or shorts in the wires leading to and from the IAT sensor. |
| Test electrical operation | Verify the sensor is receiving the correct voltage and ground to function properly. |
| Perform a smoke test | Identify any leaks in the intake system that could alter the sensor’s readings. |
| Ensure ECM’s proper function | Check if the ECM software is updated and operating correctly, as it could affect sensor signal processing. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko