AutoCodes – Generic – P0299

P0299 Code - Engine Underboost

Quick Answer

The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor input and turbocharger actuator output to control the amount of engine induction system boost pressure. Common causes include Faulty Turbocharger Vane Position Actuator, Air leaks between the turbocharger and the intake air flow valve, Airflow restrictions in air ducts or air filter. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0299 indicates Engine Underboost.
Common causes: Common causes include Faulty Turbocharger Vane Position Actuator, Air leaks between the turbocharger and the intake air flow valve, Airflow restrictions in air ducts or air filter.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 57,725

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0299 Description

The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor input and turbocharger actuator output to control the amount of engine induction system boost pressure. The ECM calculates a desired boost pressure value and monitors the actual boost pressure. If the difference between the actual boost pressure and the desired boost pressure is less than or greater than a calibrated threshold level, the ECM detects that the amount of detected boost pressure is out of range. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the difference between the actual boost pressure and the desired boost pressure in the intake manifold is less than the expected range for 12.5 s. The 12.5 s time is not continuous but cumulative. The timer may sum up a heavy load condition obtained during different maneuvers.

OBDII Code P0299 - Engine Underboost - AutoCodes.com — P0299 Code - Engine Underboost

What does this mean?

What are the Possible Causes of the DTC P0299?

Faulty Turbocharger Vane Position Actuator
Air leaks between the turbocharger and the intake air flow valve
Airflow restrictions in air ducts or air filter
Ice or debris in the induction system
Leaks at the Positive Crankcase Ventilation (PCV) system
Faulty Turbocharger

How to Fix the DTC P0299?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0299 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P0299 Acura — Turbocharger Underboost Problem
P0299 Buick — Engine Underboost
P0299 Cadillac — Engine Underboost
P0299 Chevrolet — Engine Underboost
P0299 Chrysler — Boost In Range Low
P0299 Ford — Turbo/Supercharger Underboost
P0299 GMC — Engine Underboost
P0299 Honda — Turbocharger Underboost Problem
P0299 Isuzu — Turbocharger Engine Underboost
P0299 Volkswagen — Turbocharger Engine Underboost

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.