P00F3

Turbocharger/Supercharger Boost Control D Performance

P00F3 is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control D Performance. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P00F3
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P00F3 means

P00F3 is a generic powertrain code indicating that the Engine Control Module (ECM) has detected a range or performance problem with the intake air humidity sensor circuit. Unlike a hard circuit high or low fault, a range/performance code means the signal is electrically present but does not behave as expected. The reading may be stuck, drift implausibly, or fail to correlate with other intake and ambient conditions. The humidity sensor reports moisture content in the incoming air, which the ECM uses to refine air-fuel calculations, spark timing, and combustion and emissions strategies such as NOx and knock modelling.

Common causes include a drifting or aging humidity sensor element, contamination or condensation on the sensing element, intermittent wiring or connector resistance, or a faulty integrated intake air temperature and humidity module. Because the fault is a rationality check, the ECM typically compares the humidity value against expected values derived from temperature, pressure, and ambient data before flagging the code.

Drivability impact is generally minor; the ECM falls back to modelled humidity and most drivers only see the warning light. Diagnosis should begin by monitoring the live humidity value and watching how it responds over a drive cycle, then inspecting the sensor and connector for contamination or intermittent connection before replacing the sensor.

Common causes

Most-frequently reported root causes when P00F3 is logged.

  • 1
    Humidity sensor element drifting or aging out of its rational range.
  • 2
    Contamination or condensation on the sensing element.
  • 3
    Intermittent high-resistance in the signal or ground wiring.
  • 4
    Corroded or loose sensor connector causing erratic readings.
  • 5
    Faulty integrated intake air temperature and humidity module.
  • 6
    Sensor reading not correlating with other intake and ambient sensors.
  • 7
    Water intrusion into the sensor or its connector.

Symptoms drivers notice

Check engine light on with P00F3 stored.
Scan tool shows a stuck, drifting, or implausible humidity reading.
Humidity value fails to change with ambient conditions.
Minor changes in fuelling or emissions behaviour.
Often no driver-perceived performance change.

How to diagnose P00F3

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all codes and observe the live humidity value on a scan tool.
  2. 2
    Watch how the humidity reading responds across a drive cycle and temperature change.
  3. 3
    Compare the humidity signal against intake temperature, pressure, and ambient data.
  4. 4
    Inspect the sensor and connector for contamination, moisture, or corrosion.
  5. 5
    Check signal and ground wiring for intermittent high resistance.
  6. 6
    Replace the sensor only after confirming wiring integrity, then clear and retest.

Related powertrain codes

Frequently asked questions

What does P00F3 mean?

It is a range or performance (rationality) fault on the intake air humidity sensor circuit, not a turbocharger boost control fault.

How does range/performance differ from a circuit fault?

The signal is electrically present but implausible or stuck, whereas a circuit high or low fault means the voltage is outside its valid electrical range.

Can contamination cause P00F3?

Yes, condensation or debris on the humidity sensing element can make the reading drift or stick, triggering the rationality check.

Is it safe to drive with P00F3?

Generally yes, because the ECM uses a modelled humidity value, but repairing it restores accurate air-density and emissions control.

Disabling P00F3 in software

RaceTune can permanently disable P00F3 — 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.

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