P0299 on Renault
Turbo/Supercharger Underboost Condition
P0299 on Renault vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 2 Renault models — most commonly on Captur, Megane. P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. Typical repair costs on Renault range from $200 to $2,800, depending on the specific model and root cause.
Common Causes of P0299
- •Boost/intake leak (cracked or loose charge-air hose or intercooler)
- •Faulty or sticking turbo wastegate or actuator
- •Stuck or clogged variable-geometry turbo vanes (VGT)
- •Faulty boost pressure or MAP sensor
- •Leaking or disconnected vacuum/boost control lines
- •Restricted air intake or clogged air filter
- •Failed boost control solenoid
- •Worn or failing turbocharger
P0299 on Renault by Model
Renault Captur(1 issue)
- TCe Turbocharger Issues2013-2026
The small-displacement TCe turbo engines in the Captur suffer from turbo wastegate rattle and oil seal leaks. The wastegate actuator arm develops play, causing a rattling noise at idle and under light load.
Renault Megane(1 issue)
- 1.5 dCi (K9K) Turbocharger Failure from Oil Starvation2003-2015
The K9K 1.5 dCi diesel in the Mégane II and III suffers well-documented turbocharger failures caused by oil starvation: extended oil-change intervals let carbon sludge block the narrow turbo oil feed pipe and sump pickup strainer, starving the turbo bearings. A sticking EGR valve raising exhaust gas temperatures accelerates the bearing failure. Owners report sudden loss of power, a whining turbo and blue smoke; if debris from the failed turbo enters the engine, the bill escalates sharply.
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View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Renault?▼
P0299 stands for "Turbo/Supercharger Underboost Condition." P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. On Renault specifically, this code is documented across 2 models.
What causes P0299 on Renault vehicles?▼
Common causes on Renault: Boost/intake leak (cracked or loose charge-air hose or intercooler), Faulty or sticking turbo wastegate or actuator, Stuck or clogged variable-geometry turbo vanes (VGT), Faulty boost pressure or MAP sensor, Leaking or disconnected vacuum/boost control lines. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0299 on a Renault?▼
Repair costs on Renault range from $200 to $2,800, depending on the specific model and root cause.
Which Renault models have P0299 documented?▼
Au7o has documented P0299 on 2 Renault models: Captur, Megane.