P0299 on Opel
Turbo/Supercharger Underboost Condition
P0299 on Opel vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 2 Opel models — most commonly on Agila, Movano. 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 Opel range from $600 to $2,500, 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 Opel by Model
Opel Agila(1 issue)
- 1.3 CDTi turbocharger whistle, boost loss and premature replacement2008-2014
Turbocharger complaints are documented across 1.3 CDTi versions, presenting as whistling, loss of boost pressure and premature turbo replacement. On this engine the turbo rarely fails in isolation: a clogged EGR valve and carbonised intake, common on the short-journey town cars the Agila typically leads, raise back-pressure and exhaust temperature and shorten turbo life, while high oil consumption reduces the quality of the oil feeding the turbo bearing. The 75 hp version fitted to the Agila is the variant with the heaviest concentration of negative reports.
Opel Movano(1 issue)
- Turbocharger failure on the 2.3 dCi M9T, usually driven by DPF back-pressure rather than the turbo itself2011-2024
The M9T 2.3-litre unit (2,298 cc, 136-190 hp, shared with the Renault Master III and Nissan NV400) is prone to turbocharger failure in hard-worked van use, and the twin-turbo BiTurbo installations are the worst affected. The chain is usually a clogged DPF raising exhaust back-pressure, which raises exhaust gas temperature, overloads the turbo bearings, develops axial play, allows oil past the seals and destroys the core. Poorly atomising injectors do the same thing by raising EGT and seizing the wastegate. Second-generation Garrett units are noted as more sensitive to sustained high EGT than the earlier ones. Symptoms are power loss with P0299 underboost or P0234 overboost, whistling under acceleration, oil in the intake and smoke.
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View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Opel?▼
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 Opel specifically, this code is documented across 2 models.
What causes P0299 on Opel vehicles?▼
Common causes on Opel: 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 Opel?▼
Repair costs on Opel range from $600 to $2,500, depending on the specific model and root cause.
Which Opel models have P0299 documented?▼
Au7o has documented P0299 on 2 Opel models: Agila, Movano.