P0299 on Volkswagen
Turbo/Supercharger Underboost Condition
P0299 on Volkswagen vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 7 Volkswagen models — most commonly on Beetle, Corrado, Golf. 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 Volkswagen range from $50 to $3,500, 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 Volkswagen by Model
Volkswagen Beetle(1 issue)
- 2.0T Turbocharger Wastegate Rattle and Failure2012-2019
The 2012-2019 Beetle with the EA888 2.0T engine develops a turbocharger wastegate rattle caused by wear in the wastegate actuator arm and pivot. The rattle is most noticeable at idle and low RPM. In severe cases, the wastegate can stick open, causing loss of boost pressure and reduced power. VW updated the turbocharger assembly to address the wastegate wear, but many early units are affected.
Volkswagen Corrado(1 issue)
- G60 Supercharger Failure1990-1992
The G-Lader scroll-type supercharger on the G60 model is prone to internal seal failure, apex strip wear, and bearing failure. Rebuilding requires specialized knowledge and the units are becoming scarce.
Volkswagen Golf(1 issue)
- Early MK7 IHI Turbocharger Failure2015-2017
The early MK7 Golf R models (2015-2017) use an IHI IS38 turbocharger that was prone to premature failure. The turbo's compressor wheel can crack or the wastegate actuator can fail, causing boost loss and potential engine damage from compressor debris entering the engine. Later production years received improved turbo units. Symptoms include sudden loss of boost, metallic rattling from the turbo, and oil smoke on acceleration.
Volkswagen Golf Alltrack(1 issue)
- IS20 Turbocharger Failure2017-2019
The IS20 turbocharger can fail prematurely due to wastegate rattle or internal bearing failure. A rattling noise at idle is the early sign of wastegate actuator wear. Some turbos fail completely before 60,000 miles.
Volkswagen Golf R(1 issue)
- Turbo Diverter Valve (DV) Failure and Boost Leak2015-2026
The electronically-controlled diverter valve (DV) on the Mk7+ Golf R IS20/IS38 turbocharger develops a torn diaphragm that causes boost leaks. The DV recirculates boost pressure when the throttle is closed; when the diaphragm tears, boost pressure escapes through the valve continuously. This results in reduced turbo response, loss of peak power, and overboost faults. The plastic housing can also crack from heat cycling. Stock and mildly tuned Golf R models are equally affected.
Volkswagen GTI(1 issue)
- Diverter Valve (DV) Failure2006-2014
The factory diaphragm-style turbo diverter valve tears and fails, causing boost leaks, loss of power, and poor turbo response. The rubber diaphragm rips from the pressure cycling. Very common on MK5 and MK6 GTI.
Volkswagen Jetta(1 issue)
- Turbocharger Failure/Wastegate Rattle2008-2019
The turbocharger can fail due to oil starvation, wastegate wear, or bearing failure. Wastegate rattle is common on IHI turbos used in earlier models. Turbo failure can send debris into the engine.
Looking for P0299 on a different make?
View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Volkswagen?▼
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 Volkswagen specifically, this code is documented across 7 models.
What causes P0299 on Volkswagen vehicles?▼
Common causes on Volkswagen: 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 Volkswagen?▼
Repair costs on Volkswagen range from $50 to $3,500, depending on the specific model and root cause.
Which Volkswagen models have P0299 documented?▼
Au7o has documented P0299 on 7 Volkswagen models: Beetle, Corrado, Golf, Golf Alltrack, Golf R, GTI, Jetta.