Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Open circuit in the BARO sensor signal wire]
- map[cause:Short to power in the sensor wiring harness]
- map[cause:Defective barometric pressure sensor stuck at maximum output]
- map[cause:Poor sensor ground connection]
- map[cause:Water or debris inside the sensor connector]
How to Fix It
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Use an OBD-II scanner to confirm P2229 and check for related MAP codes.
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Inspect the sensor connector and harness for open wires or shorts.
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Verify proper ground at the sensor connector with a multimeter.
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Measure sensor reference voltage — should be near 5V from the ECM.
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Replace the barometric pressure sensor if wiring is confirmed good.
Frequently Asked Questions
Will P2229 cause my car to stall?
Not typically, but a lean fuel condition from incorrect BARO readings can cause hesitation. In severe cases, it may cause hard starting in extreme temperatures.
How do I know if it's the sensor or the wiring?
Test the signal wire for continuity from the sensor to the ECM. If the wire is fine, the sensor itself is likely bad.
What does 'short to power' mean?
It means a wire that should carry a small signal is accidentally touching a power wire. This forces the voltage reading higher than it should be.