P0114

Intake Air Temperature Circuit Intermittent Bank 1

P0114 is a generic OBD-II powertrain diagnostic trouble code: Intake Air Temperature Circuit Intermittent Bank 1. It is logged by the engine control unit when the air/maf monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0114
Group
Powertrain
System
Air/MAF
Severity
Warning (MIL on)
Need P0114 disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P0114 means

P0114 is set when the PCM detects that the IAT sensor 1 signal voltage is erratic or intermittently drops out of the expected range, rather than remaining continuously out of range as with P0112/P0113. The intermittent nature makes this one of the more challenging sensor faults to diagnose: the circuit may function perfectly during a static workshop inspection but fail transiently under vibration, temperature cycling, or flex of the wiring harness during normal driving.

The most common root cause is a wiring or connector issue — cracked insulation, a loose or corroded connector pin, or a sensor that was accidentally left unplugged after an air filter service. Even a brief loss of the 5 V reference or signal ground produces a transient out-of-range reading the PCM records as P0114. A wiggle test along the harness while monitoring the IAT voltage PID live on a scan tool is the most effective way to reproduce the fault. Oscilloscope monitoring during a road test is even more sensitive, as it can capture dropouts too brief for a scan tool's refresh rate to display.

Once a wiring fault is ruled out, a thermistor with an internal hairline fracture — making intermittent resistance contact under vibration — is the next suspect. Record short-term fuel trim during a road test alongside the IAT PID; a coincident STFT spike at the moment the IAT value jumps confirms the PCM is briefly acting on the bad data and validates the fault path before condemning any component.

Common causes

Most-frequently reported root causes when P0114 is logged.

  • 1
    Loose or corroded IAT/MAF connector causing momentary loss of signal or reference under vibration.
  • 2
    IAT sensor accidentally left unplugged after air filter or intake service.
  • 3
    Cracked or chafed signal wire insulation producing an intermittent short or open, especially near the air filter housing flex joint.
  • 4
    Spread or pushed-back terminal pins in the connector reducing contact tension.
  • 5
    IAT sensor with an internally cracked thermistor making erratic resistance contact.
  • 6
    Moisture or condensate entering the connector and causing transient resistance changes.
  • 7
    High resistance in the sensor ground path causing the signal to shift erratically with temperature or vibration.

Symptoms drivers notice

Check engine light illuminated with a stored or pending P0114 freeze frame.
Intermittent hesitation or stumble during acceleration that self-resolves.
Occasional rough cold-start idle that smooths after a few seconds.
Transient fuel economy deterioration with no consistent pattern.
No fault reproduced during workshop inspection — vehicle performs normally on a test drive.
Short-term fuel trim (STFT) showing brief positive or negative spikes coinciding with IAT reading glitches on a data logger.

How to diagnose P0114

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve freeze-frame data and record the IAT voltage and engine coolant temperature at the moment of fault to characterise the operating condition.
  2. 2
    Visually inspect the IAT/MAF connector and harness for damage, corrosion, or evidence of recent air filter service that may have left the sensor disconnected.
  3. 3
    With the engine running and live data displayed on a scan tool, perform a wiggle test along the IAT harness from sensor to PCM while watching for IAT voltage dropout; an oscilloscope is preferable for catching sub-100 ms glitches.
  4. 4
    Check connector pin tension by backprobing each terminal — spread pins will show intermittent continuity under light mechanical flex; restore pin tension or replace the connector.
  5. 5
    Inspect all harness routing near the air filter housing flex joint and throttle body pivot area for chafe points where the harness could contact moving components.
  6. 6
    Perform a road test with a scan tool recording the IAT sensor PID and short-term fuel trim; a coincident STFT spike at the moment of IAT dropout confirms the sensor data is affecting fuelling.
  7. 7
    If wiring and connector are confirmed sound, replace the IAT sensor (or MAF/IAT assembly) and retest over multiple heat cycles before clearing the fault.

Related powertrain codes

Frequently asked questions

Why does P0114 set only occasionally and not during my workshop test drive?

Intermittent faults are triggered by transient conditions — vibration at a specific road speed, a particular engine temperature, or flex of the wiring harness under cornering load. Static testing in a bay rarely replicates these. A data logger or oscilloscope recording during a real road drive is the only reliable way to catch the fault in action.

I just changed the air filter and the code appeared immediately — what happened?

The IAT sensor connector is located inside or immediately adjacent to the air filter housing on most vehicles. It is frequently knocked loose or left unplugged during air filter replacement. Reseating and locking the connector is the first thing to check.

How is P0114 different from P0112 and P0113?

P0112 is a continuously low signal (circuit shorted to ground), and P0113 is a continuously high signal (open circuit). P0114 means the fault is intermittent — the signal is valid most of the time but drops out or glitches transiently. This distinction matters because P0114 nearly always points to a wiring or connector issue rather than a definitively failed sensor.

Can I monitor short-term fuel trim to confirm P0114 is affecting engine performance?

Yes. Record both the IAT PID and STFT simultaneously during a road test. If STFT spikes in the enriching or leaning direction at the same moment the IAT value jumps to an implausible reading, the PCM is acting on the bad data and the fault is genuinely impacting fuelling. This correlation also helps justify sensor or wiring replacement.

Disabling P0114 in software

RaceTune can permanently disable P0114 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got P0114 in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file