P2229Barometric Pressure Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2229 reports a barometric sensor A voltage above anything plausible for outside air. Ford's gasoline engines judge more than 4.4 V, an altitude below -1,000 ft, over 5 s; the 2023 diesels use 4.85 V (115 kPa) after 0.5 s. GM's 2018 diesel tables look for contact with a voltage source: over 94.1 % of the 5 V range (115.1 kPa) in 320 of 400 readings, Type B. Mazda bulletin 01-008/20 shows a less obvious cause on the 2018-2020 Mazda6 2.5 turbo: the BARO sensor lives inside the PCM and breathes through a filter hole on its underside. Wax sprayed into the engine bay can seal that hole, so the trapped air builds pressure as the PCM heats up. Mazda replaces the PCM with a reshaped bracket. Ford's 2024 software reports P2226-17 instead; P2228 is the low counterpart.
- What you may notice
- Check engine light, often only after the engine bay has heated up
- Auto start-stop deactivated
- Scan tool shows barometric pressure far above the real value
- Likely causes
- PossibleBreather filter of a PCM-internal BARO sensor clogged (e.g. engine-bay wax, Mazda 01-008/20)
- PossibleSignal wire of an external sensor shorted to 5 V or battery voltage
- RareInternal fault of the sensor or the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.