Code
P0114
HUMMER
P — Powertrain
Intake Air Temperature Circuit Intermittent
AI status
Completed
Completed
100%
Causes
- Damaged or corroded IAT sensor connector or terminals
- Broken, chafed or shorted wiring in the IAT circuit
- Failing IAT sensor (thermistor out of spec or intermittent)
- Water intrusion or contamination at the sensor or connector
- Poor connection at ECU or loose/cracked ECU pin
- Aftermarket intake, repair, or harness modifications
Symptoms
- Malfunction Indicator Lamp (MIL) or CEL may illuminate intermittently
- Intermittent poor idle, stumble or hesitation on acceleration
- Occasional hard cold starts or rich/lean running until sensor stabilizes
- Unstable fuel trims or IAT reading shown as erratic on scan tool
- Reduced engine performance or driveability complaints under certain conditions
What to check
- Retrieve freeze frame and live data with a scan tool; note IAT value and behavior during key-on and engine warm-up
- Visually inspect IAT sensor and connector for corrosion, bent pins, damage, dirt or moisture
- Wiggle test harness and connector while monitoring live IAT reading for interruptions
- Measure sensor resistance and compare to expected values (see signal_params and factory data)
- Back-probe signal and reference/ground circuits; check for correct reference voltage and stable signal voltage
- Check continuity and for shorts between sensor signal wire and ground/5V
Signal parameters
- IAT sensor is typically an NTC thermistor: resistance decreases as temperature increases
- Typical resistance: roughly ~10 kΩ at 25°C (varies by supplier; consult factory spec for exact values)
- Typical signal voltage range: about 0.2–4.8 V across operating temperature range (cold = higher voltage, warm = lower voltage for NTC type)
- Reference/pull-up often supplied by ECU (commonly a 5 V reference) — signal should not be held at a fixed 0 V or full 5 V
- Expected behavior: smooth, monotonic change in resistance/voltage as air temperature changes; no rapid jumps
Diagnostic algorithm
- Use a scan tool to record IAT data, freeze frame and note conditions when code set. Check for other stored codes.
- Perform a visual inspection of sensor, intake inlet, wiring, and connector. Look for corrosion, bent pins, water, or damage.
- With connector disconnected, measure sensor resistance across its two terminals at ambient temp; compare to factory spec or expected NTC curve. If resistance is erratic or out of range, replace sensor.
- With connector back on, back-probe signal and reference circuits. With key ON (engine off) verify reference voltage from ECU (commonly ~5 V) and signal voltage corresponds to ambient temperature. Start engine and watch for intermittent changes or dropouts while wiggling harness.
- Check continuity from the sensor connector to the ECU pin and for shorts to ground or 5 V. Repair any open or shorted wires, repair chafed sections, and replace damaged connectors.
- If harness and sensor check good, swap with known-good sensor (if available) or replace IAT sensor and retest.
- If problem persists after sensor and harness repair, inspect ECU connector and pins. If wiring and sensor are good, consider ECU diagnosis by a qualified technician or dealer.
- Clear stored codes, perform road test under conditions that previously caused the fault to confirm repair.
Likely causes
- Corroded connector at the IAT sensor allowing intermittent contact
- Wire insulation damaged near engine mounts or intake causing intermittent short-to-ground or open when hot
- Sensor element starting to fail and changing resistance erratically
- Moisture ingress after washing engine or from intake duct leak
- Connector pushed back on pins or bent terminals causing intermittent contact
Fault status
Status
Intermittent fault detected in Intake Air Temperature sensor/circuit (P0114). MIL may be set. Monitor live IAT data and inspect sensor wiring and connector for intermittent open/short conditions.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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