P0129 - Barometric Pressure Too Low

Barometric pressure reading is lower than expected for current conditions.

Code Overview

Barometric pressure reading is lower than expected for current conditions.

Common Causes

• BARO/MAP sensor issue
• Wiring fault
• Restricted intake
• Sensor reference voltage problem

Diagnostic Steps

1. Compare BARO/MAP to local atmospheric pressure
2. Inspect vacuum routing and intake ducting
3. Verify reference voltage and ground

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.