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OBD Code P2229

Barometric Pressure Sensor A/B Correlation

CodeP2229
DescriptionBarometric Pressure Sensor A/B Correlation
Possible CausesSensors disagree|Faulty BARO sensor|Altitude issue
SymptomsIncorrect atmospheric reading|Power issues at altitude
SystemAir Metering

What Does P2229 Mean?

Barometric Pressure Sensor A/B Correlation. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the air metering.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P2229

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Inspect the pressure sensor connector for corrosion or damage.
  2. Test the sensor resistance or voltage output with a multimeter.
  3. Check the 5V reference signal at the sensor connector.
  4. Verify actual pressure with a mechanical gauge to cross-reference the sensor reading.
  5. Replace the pressure sensor if readings are inaccurate.
  6. Clear codes and verify readings under different operating conditions.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P2229 serious?

The severity depends on the underlying cause. Some triggers for P2229 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P2229 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P2229?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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