P00F0

Code

Generic P — Powertrain

Intake Air Temperature Sensor 3 Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 34 EN: 49 RU: 31

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Causes

Open or high-resistance wiring between IAT sensor and ECM (broken wire, connector corrosion)
Short to battery voltage or accessory power on the IAT signal circuit
Faulty IAT sensor (internal open or degraded thermistor)
Corroded, loose, or contaminated connector at the sensor or ECM
Aftermarket wiring or repairs with incorrect routing/insulation
ECM/PCM internal fault or poor ground (less common)

Symptoms

Check Engine Light (Malfunction Indicator Lamp) illuminated
Incorrect intake air temperature displayed in live data or scan tool
Poor driveability: rough idle, hesitation, or reduced performance
Degraded fuel economy or running rich/lean depending on ECU fallback
Hard starting in some conditions (cold or hot start behavior altered)

What to check

Read and record freeze frame and live data for IAT sensor(s) with a scan tool
Visual inspection of IAT3 sensor, connector, and wiring on Bank 2 for damage, corrosion, or disconnection
Check for other related codes that could indicate shared circuit issues
Backprobe the signal and ground circuits with the key on to observe voltage
Measure sensor resistance at ambient temperature (compare to expected range or another identical sensor if available)
Wiggle wiring harness while observing live data or during test drive to look for intermittent faults

Signal parameters

Typical IAT signal: approximately 0.2–4.8 V depending on intake temperature and vehicle design (varies by manufacturer)
IAT sensors are commonly NTC thermistors: resistance decreases as temperature rises
Typical resistance at ~25 °C often in the low kΩ range (example ~2–5 kΩ — manufacturer values vary)
A 'circuit high' fault means measured signal voltage or calculated temperature is above the ECM's allowed threshold (or sensor shows open/high resistance)
Reference supply is commonly 5 V or an internal pull-up; signal reference and wiring topology vary by vehicle

Diagnostic algorithm

Retrieve all DTCs and freeze-frame data. Confirm P00F0 is current and note engine conditions when set.
Use a scan tool to view IAT3 live data and compare with ambient temperature and other temp sensors (ECT). Look for inconsistent or stuck high readings.
Visually inspect the IAT3 sensor, connector, and wiring harness on Bank 2 for damage, corrosion, pin pushed out, or water intrusion.
With key ON (engine off), backprobe the IAT3 connector: verify reference voltage (if present), signal voltage, and ground continuity to ECM. Compare to expected values from vehicle manual.
Measure sensor resistance with connector disconnected. Compare resistance to expected approximate values or to another bank's identical sensor. An open or very high resistance indicates a bad sensor.
Check continuity between the sensor connector and ECM pin: low resistance to ground/return and correct continuity to the ECM signal pin. Check for shorts to battery (+) and to ground.
If wiring and connectors are good but signal still high, substitute a known-good IAT sensor or temporarily connect an equivalent resistor to simulate the sensor and observe ECM response.
Repair any wiring or connector faults (repair splices, replace connector, protect harness), or replace the IAT3 sensor if proven faulty.
Clear codes and perform functional verification: retest with scan tool, monitor live data, and complete a drive cycle to confirm code does not return.
If problem persists after sensor and wiring verified, consider ECM input circuit fault and consult OEM diagnostics for ECM testing or replacement.