P2228: Barometric pressure sensor A circuit low
The ECU sees too low a voltage from the barometric pressure sensor. Nearly always a broken wire, a poor connector or the sensor itself.
| Code | P2228 |
|---|---|
| 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 P2228 means
The barometric pressure sensor measures outside air pressure to adjust the mixture and turbo boost. Circuit low means the ECU gets a voltage below what is possible, which usually points to an electrical fault: a broken wire, a wire shorted to earth or no supply. If the sensor is inside the ECU, the fault may be internal.
Most common causes
- Loose or corroded sensor connector
- Signal wire broken or shorted to earth
- No 5 volt supply to the sensor (sometimes shared with other sensors)
- Faulty barometric sensor
- Internal ECU fault if the sensor is built in
Symptoms
- Engine warning light on
- Possible lack of power or limited boost
- Sometimes slightly worse starting or idle
Can you drive with P2228?
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
Look at live barometric pressure with the engine off: a very low or zero value means an electrical fault. If other sensors show circuit low codes at the same time, suspect the shared 5 volt supply.
How to read and clear P2228 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 P2228 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
- P2224 The NOx sensor heater detection (bank 2) gives a higher signal than normal
- 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
- P2229 Barometric pressure sensor A circuit high
- 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
- 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 P2228 mean?
The barometric pressure sensor measures outside air pressure to adjust the mixture and turbo boost. Circuit low means the ECU gets a voltage below what is possible, which usually points to an electrical fault: a broken wire, a wire shorted to earth or no supply. If the sensor is inside the ECU, the fault may be internal.
Can you drive with P2228?
You can drive, but the ECU will use a default value and may limit power. Get it checked soon.
How do you clear P2228?
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, P2228 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.
