P2229: Barometric Pressure Sensor A Circuit High
What to do
Expect worse fuel economy and possibly a fuel smell, since the engine is being fuelled for denser air than there is. If anything has recently been done to the intake, ask for the sensor connector to be checked first — a plug knocked loose gives exactly this code.
What this code means
The barometric pressure circuit reads above its valid range — an open circuit, a short to supply, or a reported pressure higher than sea level ever reaches.
The fuelling consequence is the opposite of P2228: the module believes the air is denser than it is and adds fuel, so the engine runs rich, with the fuel consumption and converter concerns that go with it.
An open circuit is also what a disconnected sensor looks like, and on the engines that use the manifold pressure sensor for this reading, that sensor is in a place regularly disturbed by intake work. A code that appeared after any work on the induction system deserves a physical check of the connector before anything is tested.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Disconnected sensor connector · easy
- Faulty manifold absolute pressure sensor · easy
- Corroded or loose connector · easy
Less common
- Wiring shorted to voltage · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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