Code dictionary Generic OBD-II
P0299Turbocharger/Supercharger A Underboost Condition
This is a definition, not a repair instruction. It does not identify a failed part or establish that a vehicle is safe to drive.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Separately researched
Vehicle-specific diagnosis
These guides address the exact vehicles and conditions in their sources. Select the guide that matches your vehicle.
Audi
Audi A4 P0299: confirm the CAEB wastegate diagnosis
A4 CAEB: distinguish intake faults, sporadic codes and confirmed wastegate wear before replacing a turbocharger.
Porsche
2015 Porsche Macan Turbo P0299: software or hardware?
Use recorded rpm, engine load and DME version to guide diagnosis before parts.
Chevrolet
Chevrolet Cruze P0171/P1101: the PCV leak and manifold valve check
Distinguish a leaking camshaft-cover diaphragm from the intake-manifold cause that can damage it.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT