P0114
UniversalThe Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an intermittent signal from the Intake Air Temperature (IAT) sensor circuit, meaning the signal intermittently goes out of expected range or is erratic.
Medium SeverityThe Intake Air Temperature (IAT) sensor circuit is experiencing intermittent electrical connectivity or signal readings. This intermittent signal can cause the engine computer to receive incorrect air temperature data, leading to potential issues with fuel delivery and engine performance.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on electrical components. Allow the engine to cool down before handling any engine bay components to avoid burns. Be careful when probing electrical connectors to avoid damaging pins.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Decreased fuel economy
- Poor engine performance, especially during cold starts or significant temperature changes
- Black smoke from exhaust (rich condition)
- Engine hesitation or stalling
Common Causes
- Loose or corroded electrical connector at the IAT sensor or PCM
- Intermittent open or short in the IAT sensor wiring harness
- Faulty IAT sensor itself, providing erratic readings
- Damage to the wiring from chafing or heat
- Rarely, a faulty PCM/ECM (Powertrain Control Module/Engine Control Module)
Frequently reported on: General/Universal, Honda Civic 2006-2011, Toyota Camry 2002-2006, Ford F-150 2004-2008
Diagnostic Steps
- Visually inspect the IAT sensor connector and wiring for any signs of damage, corrosion, or loose connections. Wiggle the wires to see if the symptoms change or if the code appears.
- Disconnect the IAT sensor and inspect the terminals for bent pins or corrosion. Clean the terminals if necessary.
- Using a multimeter, check for proper reference voltage (typically 5V) and ground at the IAT sensor connector with the ignition on. Refer to your vehicle's specific wiring diagram.
- Test the IAT sensor resistance using a multimeter at various temperatures (if possible, by removing it and placing it in hot/cold water) to check for erratic or out-of-spec readings. The resistance should change smoothly with temperature.
- If wiring and sensor appear good, consider replacing the IAT sensor, as it's a common and relatively inexpensive part.
- If the issue persists, a more in-depth diagnosis of the wiring harness for intermittent opens/shorts (e.g., continuity test while wiggling wires) may be required, or professional help might be needed to check the PCM.
👨🔧 When to Call a Professional
If you have replaced the IAT sensor and thoroughly checked the wiring, but the P0114 code continues to appear intermittently, it's time to consult a professional to diagnose potential ECM/PCM issues or complex wiring harness problems.
Commonly Asked Questions
Can I drive with a P0114 code?
While often not immediately critical, driving with P0114 can lead to reduced fuel economy and engine performance, and in some cases, hesitation or stalling. It's best to address it promptly.
Where is the IAT sensor located?
The Intake Air Temperature sensor is typically located in the intake manifold, the air intake tube after the air filter, or integrated into the Mass Air Flow (MAF) sensor.
How can I tell if the IAT sensor is truly faulty or if it's a wiring issue?
An intermittent code like P0114 strongly suggests either an aging sensor with erratic readings or a loose/damaged wire connection. Testing the sensor's resistance while heating/cooling it, and performing a wiggle test on the wiring, can help pinpoint the cause.
Will cleaning the IAT sensor fix the P0114 code?
Sometimes, if the sensor element is dirty, cleaning it with a specialized MAF sensor cleaner can resolve intermittent readings. However, if the sensor itself is internally faulty or the wiring is damaged, cleaning alone won't fix it.
Does P0114 affect emissions?
Yes, an intermittent or incorrect Intake Air Temperature reading can cause the engine to run too rich or too lean, leading to increased harmful emissions and potentially causing you to fail an emissions test.