OBD-II trouble code
P0114: Intake Air Temperature Sensor Circuit Intermittent
The IAT signal is dropping out or jumping erratically rather than failing outright — present one moment, gone the next. Intermittent codes are the hardest of the IAT family to pin down because the fault often isn't happening while the car is sitting in front of you.
Quick facts
- System
- Powertrain
- Category
- Sensors / Air Intake
- Severity
- Low severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $80 – $400
- DIY difficulty
- Intermediate DIY
What does P0114 mean?
P0114 is the intermittent-fault version of the intake air temperature circuit codes, and it calls for a different mindset than the others. P0112 and P0113 describe a signal that's solidly stuck too low or too high — a steady, repeatable fault you can usually catch on a scan tool the moment you connect it. P0114 sets when the IAT signal flickers: it reads normally, then briefly spikes, drops out, or jumps to an impossible value, then recovers. The PCM logs the glitch and sets the code, but by the time you go looking, the signal may be behaving perfectly. That's what makes intermittents frustrating — the problem is real, but it hides.
Because the fault comes and goes, the cause is almost always something mechanical that's only sometimes making bad contact: a connector pin that's backed out a hair, a wire with a hairline break inside the insulation, a corroded terminal that conducts until it heats up or vibrates, or a sensor on its way out that drops signal under thermal stress. Vibration, temperature, and moisture are the three triggers that turn a marginal connection into a momentary open. This is why the wiggle test — physically flexing the harness and connector while watching live data — is the single most productive diagnostic step for P0114, far more than swapping the sensor on a guess.
The driveability impact is minimal and inconsistent by nature. You might feel a momentary stumble or notice the check engine light flicker on and off, but most of the time the engine runs fine. As with the rest of the IAT family it's a low-severity code, and the motivation to fix it is the emissions hold plus the simple fact that intermittent electrical faults tend to get worse — today's flicker is often tomorrow's hard failure.
Common causes
- Backed-out or loose connector pin making intermittent contact
- Hairline break in the signal or ground wire inside the insulation
- Corroded terminal that conducts until heat or vibration breaks contact
- Sensor element failing under thermal stress, dropping signal when hot
- Connector that loosens or shorts only over bumps (vibration-sensitive)
- Moisture intrusion that intermittently bridges or opens the circuit
- Failing MAF/IAT combo unit on engines that share a housing
- Chafed wire that only contacts ground under engine movement or load
Symptoms
- Check engine light that comes on, then sometimes clears on its own
- IAT live-data value that occasionally spikes, drops, or jumps then recovers
- Momentary hesitation or stumble that's hard to reproduce
- Brief cold-start roughness on some occasions but not others
- Engine runs normally most of the time
- Emissions / smog test failure if the code is currently set
Diagnostic steps
- 1.Connect a scan tool and watch the IAT value in live data while you physically wiggle the connector and flex the harness — a reading that jumps or drops as you move the wires localizes the fault immediately.
- 2.Inspect the connector closely for backed-out, spread, or corroded pins. Gently tug each wire at the connector to feel for a loose crimp.
- 3.Use the freeze-frame data the PCM stored with the code to see the conditions when the glitch happened — cold start, hot soak, rough road — and try to recreate them.
- 4.Flex and inspect the harness along its full run, paying attention to spots where it crosses brackets, the block, or moving components.
- 5.If the fault tracks with engine temperature, heat the suspect connector and sensor with a heat gun (carefully) while watching live data to provoke the dropout.
- 6.Replace the sensor only after wiring and connector checks are clean — on combo MAF/IAT housings, a sensor confirmed to drop out under heat means the assembly.
Repair cost
$80 – $400
Intermittents are often the cheapest IAT repair once found — a re-pinned connector, a cleaned terminal, or a short splice repair can land under $100, and the cost is mostly diagnostic time. A standalone sensor that drops out under heat runs $80-$200 installed. If the IAT is integrated into a mass airflow housing, the assembly is $250-$400. The wide range reflects that finding an intermittent can take more labor than fixing it.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with intake air temperature sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.