Intake Air Temperature Sensor Circuit Intermittent
The P0114 code indicates an intermittent fault in the intake air temperature (IAT) sensor circuit on bank 1. The IAT sensor is a thermistor that measures incoming air temperature and sends a voltage signal to the PCM. An intermittent circuit issue means the signal is erratic or drops out temporarily, often due to loose connections, damaged wiring, or a failing sensor. This can cause incorrect air-fuel mixture adjustments, affecting engine performance and fuel economy.
1. Most Common Causes
- Loose or corroded IAT sensor connector
- Damaged wiring or short circuit in the IAT circuit
- Faulty IAT sensor
- Intermittent PCM issue (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Poor fuel economy
- Rough idle or hesitation
- Black smoke from exhaust (rich mixture)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to capture conditions when fault occurred.
Step 2: Visually inspect IAT sensor connector and wiring for damage, corrosion, or loose pins.
Step 3: Use a multimeter to check IAT sensor resistance at different temperatures; compare to specs.
Step 4: Wiggle test the wiring harness while monitoring IAT signal with a scan tool to reproduce intermittent fault.
Step 5: If wiring and sensor check out, test PCM input/output for intermittent signal loss.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause poor performance and reduced fuel economy. Fix it soon to avoid further issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on whether it's a sensor replacement or wiring repair.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.