Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Faulty barometric pressure sensor sending low voltage]
- map[cause:Short to ground in the sensor signal wire]
- map[cause:Damaged or corroded wiring harness connector]
- map[cause:Failed MAP sensor — some vehicles share BARO and MAP sensor functions]
- map[cause:Vacuum leak near the intake that affects pressure readings]
How to Fix It
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Scan for all codes — MAP sensor codes often appear alongside P2228.
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Inspect the BARO sensor wiring harness for damage, cuts, or corrosion.
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Check for vacuum leaks in the intake manifold area.
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Test BARO sensor voltage with a multimeter — compare to expected range.
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Replace the barometric pressure sensor if it tests out of spec.
Frequently Asked Questions
What does the barometric pressure sensor do?
It measures atmospheric pressure outside the car. The ECM uses this to adjust the air/fuel mixture for altitude changes. Higher altitude means less air, so the engine needs less fuel.
Can I drive with P2228?
Yes, but your fuel economy may suffer and the engine could run rough. Fix it soon to avoid long-term fuel system strain.
Is the BARO sensor the same as the MAP sensor?
On some vehicles they are the same unit. On others they are separate. Your repair manual will clarify which setup your vehicle uses.