P2229: Barometric pressure sensor A circuit high
The ECU sees too high a voltage from the barometric pressure sensor. Usually a damaged wire, a missing earth or the sensor itself.
| Code | P2229 |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P2229 means
The barometric pressure sensor measures outside air pressure so the ECU can adjust the mixture and boost. Circuit high means the voltage is above what is possible, almost always because of an electrical fault: a broken sensor earth, a signal wire touching a voltage source or the sensor itself. If it is inside the ECU, the fault may be internal.
Most common causes
- Loose or corroded sensor connector
- Broken sensor earth wire
- Signal wire touching a voltage source
- Faulty barometric sensor
- Internal ECU fault if the sensor is built in
Symptoms
- Engine warning light on
- Possible lack of power or limited boost
- Fuel consumption slightly off
Can you drive with P2229?
With care You can drive, but the ECU will use a default value and may limit power. Get it checked soon.
Open the bonnetthe in-depth explanation
How to check it
With the engine off, look at live barometric pressure: a value well above normal (around 100 kPa at sea level) means an electrical fault. Gently move the sensor wiring while watching the reading to see if it changes.
How to read and clear P2229 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2229 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2225 The NOx sensor heater detection (bank 2) fails now and then
- P2226 The barometric pressure sensor A has an electrical fault
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
- P222A The barometric pressure sensor B has an electrical fault
- P222B The barometric pressure sensor B gives readings outside the normal range
- P222C The barometric pressure sensor B gives a lower signal than normal
- P222D The barometric pressure sensor B gives a higher signal than normal
- P2200 NOx sensor circuit fault (bank 1)
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2237 Oxygen sensor current control circuit open (bank 1, sensor 1)
- P2243 Oxygen sensor reference voltage circuit open (bank 1, sensor 1)
What does code P2229 mean?
The barometric pressure sensor measures outside air pressure so the ECU can adjust the mixture and boost. Circuit high means the voltage is above what is possible, almost always because of an electrical fault: a broken sensor earth, a signal wire touching a voltage source or the sensor itself. If it is inside the ECU, the fault may be internal.
Can you drive with P2229?
You can drive, but the ECU will use a default value and may limit power. Get it checked soon.
How do you clear P2229?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2229 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
