P2229 — Barometric pressure sensor reading too high

The engine control module detects a higher than expected voltage from the barometric pressure sensor, indicating the sensor circuit is reporting unusually high atmospheric pressure. This can cause incorrect air-fuel mixture adjustments, affecting engine performance and emissions.

Common causes

The cause is almost always one of a few things. Here they are — P2229 rarely comes from anything outside this list:

• Faulty barometric pressure sensor
• Damaged or corroded wiring/connectors
• Vacuum leaks affecting sensor readings
• ECU malfunction or software glitch

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and clean sensor connectors and wiring
2. Check for vacuum leaks near sensor
3. Test sensor output voltage and replace if faulty
4. Update or reflash ECU software if applicable

That is what holds for P2229 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.