P0114

Code

Generic P — Powertrain

Intake Air Temperature Sensor 1 Circuit Intermittent Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 39 EN: 83 RU: 56

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Corroded, loose, or damaged IAT sensor connector or pins
Broken or chafed wiring harness between IAT sensor and ECM
Intermittent short to voltage or ground in the IAT circuit
Failed IAT sensor (thermistor intermittent)
Poor engine/ECM ground or reference voltage supply
Intermittent ECM input circuit fault or solder joint

Symptoms

Malfunction Indicator Lamp (MIL) may illuminate sporadically
Intermittent rough idle, hesitation or stumbling under load
Erratic fuel trim behavior, occasional increased fuel consumption
Difficult or inconsistent cold starts (possible)
No constant sensor reading for intake temperature on scan tool (fluctuating or dropping to open)

What to check

Scan tool: read IAT PID while engine cold to warm and observe for dropouts or erratic jumps
Check freeze frame / freeze data and frequency of fault occurrence
Visually inspect IAT sensor connector and wiring for damage, corrosion, or looseness
Backprobe connector and check reference voltage and signal with ignition ON/engine running
Measure sensor resistance at the harness connector (with sensor disconnected) and compare to expected thermistor behavior as temperature changes
Perform wiggle test on harness and connector while monitoring IAT PID/voltage for intermittent changes

Signal parameters

Sensor type: normally an NTC thermistor (resistance decreases as temp rises)
Expected signal voltage: typically in the 0.1–4.9 V range depending on intake temp and vehicle design
Typical resistance at ~20°C: on many vehicles roughly 1–10 kΩ (varies by manufacturer)
Open-circuit: signal voltage often near reference supply (or diagnostic tool shows OL/infinite resistance)
Short to ground: signal voltage near 0 V; short to battery: signal near reference voltage (~5 V)

Diagnostic algorithm

Retrieve freeze frame and clear code; attempt to recreate fault by cycling ignition/engine and monitor IAT PID for intermittent behavior
Visually inspect sensor, connector, and wiring harness; repair visible damage, corrosion, or bent pins
Backprobe IAT connector: with ignition ON measure reference voltage (if applicable) and signal voltage while varying intake air temperature (or blow air/cold spray) — signal should move smoothly
Measure sensor resistance at sensor leads (disconnect sensor). Compare to a known thermistor resistance vs temperature chart for the vehicle or general NTC behavior. Replace sensor if values are out of expected range or erratic
Perform continuity/resistance check from sensor connector to ECM input pin; wiggle harness to look for intermittent opens
If intermittent voltage spikes or noise are seen, inspect/repair grounds and any shielding; install/repair grounds as needed
If wiring and sensor test good but intermittent signal persists, swap/replace the IAT sensor with a known-good unit and retest
If intermittent persists after harness and sensor replacement, consider ECM input circuit fault — consult service information and consider ECM bench test/replacement

Likely causes

Damaged/loose connector at IAT sensor
Frayed or intermittent wiring (chafe/wire break) between sensor and ECM
Failing IAT sensor element (internal intermittent)
Corrosion or poor contact at mating connector pins
ECM input/ground problem (less common)

Fault status

⚠️ Status

Intermittent fault reported in Intake Air Temperature Sensor 1 circuit (Bank 1). ECM detected an unstable/open/short/erratic IAT signal condition; fault set intermittently rather than continuously.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours