P0299 - Turbocharger/Supercharger Underboost Condition

Actual boost is lower than the ECM expects.

Code Overview

Actual boost is lower than the ECM expects.

Common Causes

• Sensor or control issue
• Mechanical restriction or leak
• Operating condition outside the expected range

Diagnostic Steps

1. Check supporting scan data and related codes
2. Inspect wiring, hoses, and connectors tied to the system
3. Confirm the complaint under the conditions when the code sets

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.