OBD-II Generic Error Code P2228: How to Fix It

Q: Can I drive my car with a P2228 code?

In most cases you can drive short distances, but it is not recommended for extended driving. The ECM may use a default (limp) value for barometric pressure, which can cause poor fuel economy, reduced engine power, increased emissions, and rough running. Prolonged driving with an inaccurate BARO reading can also cause unnecessary stress on other engine components. Get it diagnosed and repaired as soon as possible.

Q: Is the BARO sensor the same as the MAP sensor?

On many modern vehicles, yes — the barometric pressure sensor function is built into the MAP (manifold absolute pressure) sensor. The ECM reads atmospheric pressure through the MAP sensor before the engine starts, then switches to monitoring intake manifold pressure during operation. On some vehicles, a separate dedicated BARO sensor is mounted in the engine bay or on the firewall. Check your vehicle's service manual to determine your setup.

Q: What are the symptoms of a P2228 code?

Common symptoms include an illuminated check engine light, reduced engine power or sluggish acceleration, rough idle, poor fuel economy, increased exhaust emissions (which can cause a failed emissions test), and in some cases the vehicle entering a reduced-power or limp mode. At high altitudes, symptoms may be more noticeable because outside air pressure is already lower than at sea level.

Q: How much does it cost to fix error code P2228?

If the fix is a faulty BARO or MAP sensor, the part typically costs between $20 and $150 depending on your vehicle make and model, and a shop will charge 0.5 to 1.5 hours of labor on top of that. If the issue is a simple wiring repair or bad connector, costs could be much lower. If the fault traces back to the ECM, repairs can range from $300 to over $1,000 depending on whether the ECM can be reprogrammed or must be replaced.

Q: Will P2228 cause my car to fail an emissions test?

Yes, it is very likely. An active P2228 code means the check engine light is on, which is an automatic failure in most emissions testing programs in the United States and many other countries. Even if the light is temporarily off, incomplete readiness monitors (caused by a recently cleared code) can also result in a test failure. Repair the underlying fault and complete a full drive cycle before attempting an emissions test.

Abstract

Error code P2228 means your vehicle's engine control module (ECM) has detected an abnormally low voltage signal from the barometric pressure (BARO) sensor circuit. The BARO sensor measures outside air pressure so the ECM can adjust the fuel-air mixture for optimal combustion, especially at different altitudes. When this signal falls below the expected range, your engine may run rough, lose power, or consume excess fuel — and the check engine light will illuminate.