P2229 code meaning
Barometric Pressure Sensor A Circuit High
Powertrain system Generic code P22xx codes Check engine light
What P2229 means
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.
P2229 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2229
- 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
Common causes of P2229
- 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
- Less likelyInternal fault of the sensor or the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Barometric pressure sensorSensor wiring
What each part of P2229 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 29 | The exact fault in that area. |
What to do next
- Note P2229 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2229
What does P2229 mean?
P2229 means "Barometric Pressure Sensor A Circuit High". P2229 reports a barometric sensor A voltage above anything plausible for outside air. It is a generic code, so it means the same on every make.
Is it safe to drive with P2229?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2229 fail an emissions test?
Yes, it can. P2229 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2229 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2229 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.