Intake Air Temperature Circuit Intermittent Bank 1
P0114 indicates the PCM detected intermittent voltage fluctuations in the Intake Air Temperature (IAT) sensor circuit, causing the sensor signal to be unreliable. Since the IAT sensor reading directly influences fuel delivery calculations, these intermittent signals can cause inconsistent engine performance and fuel economy issues.
What You Might Notice
- Slightly diminished fuel efficiency
- Decreased engine performance, especially during cold starts
- Hesitation or surging at idle or during light acceleration
- Check Engine Light illuminated
- Erratic idle quality
Most Common Causes
- 1
Faulty IAT Sensor
The IAT sensor itself may be failing intermittently, producing unstable voltage signals that the PCM interprets as false temperature changes. This is the most common cause of P0114.
- 2
Corroded or Loose Sensor Connector
Corrosion, moisture, or loose connections on the IAT sensor connector can cause intermittent electrical contact and voltage fluctuations in the circuit.
- 3
Damaged Wiring in IAT Circuit
Broken, pinched, or exposed wires between the sensor and PCM can create intermittent open or short circuits, causing signal instability.
- 4
Engine Control Module (PCM) Issues
In rare cases, a faulty PCM input circuit or processing error may cause the module to misinterpret valid sensor signals as intermittent.
How to Diagnose It
- 1
Check Faulty IAT Sensor — The IAT sensor itself may be failing intermittently, producing unstable voltage signals that the PCM interprets as false temperature changes. This is the most common cause of P0114.
- 2
Check Corroded or Loose Sensor Connector — Corrosion, moisture, or loose connections on the IAT sensor connector can cause intermittent electrical contact and voltage fluctuations in the circuit.
- 3
Check Damaged Wiring in IAT Circuit — Broken, pinched, or exposed wires between the sensor and PCM can create intermittent open or short circuits, causing signal instability.
- 4
Check Engine Control Module (PCM) Issues — In rare cases, a faulty PCM input circuit or processing error may cause the module to misinterpret valid sensor signals as intermittent.
How to Fix It
- 1
Inspect and Replace IAT Sensor
Locate the IAT sensor (typically in the air intake system), test it with a multimeter to confirm erratic readings, and replace if voltage output is unstable or out of specification.
- 2
Clean and Reseat Sensor Connector
Disconnect the IAT sensor connector, clean both connector terminals with electrical contact cleaner to remove corrosion and moisture, and firmly reseat the connector to restore electrical continuity.
- 3
Inspect IAT Wiring Harness
Check the entire wiring circuit from the IAT sensor to the PCM for visible damage, breaks, pinches, or exposed wires. Repair or replace damaged sections and ensure connectors are secure.
- 4
Verify PCM Function and Clear Code
After repairs, use a diagnostic scanner to clear the fault code and monitor for reoccurrence during test drive. If code returns despite sensor/wiring repairs, the PCM may require replacement or reprogramming.
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