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p0299
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Volkswagen · Sedans
Turbocharger/Supercharger A Underboost Condition
Quick Answer
Error code P0299 on your Volkswagen Sedans means: Turbocharger/Supercharger A Underboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
3H3CCID7BUBU-GLI3G3G-GTE3DArteon SE 2024Arteon SEL Premium R-Line 2024ID.7 Pro S 2025ID.7 Pro S Plus 2025Jetta GLI Autobahn 2024Jetta GLI S 2024Jetta S 2024Jetta SE 2024Jetta SEL 2024Jetta Sport 2024
Likely Causes
  1. Boost leak in intercooler piping or charge pipes
  2. Stuck or seized turbocharger wastegate
  3. Failing turbocharger with worn bearings or damaged compressor wheel
  4. Faulty boost pressure sensor (MAP sensor)
  5. Clogged catalytic converter or exhaust restriction
How to Fix It
1
Inspect all charge pipes, intercooler hoses, and clamps for leaks or disconnections
2
Perform a boost leak test by pressurizing the intake tract and listening or spraying soapy water for leaks
3
Check the turbo wastegate for free movement by manually actuating the linkage
4
Monitor actual vs. requested boost pressure with a scan tool during a test drive
5
Inspect the turbocharger for shaft play, oil leaks, and compressor wheel damage
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Charge pipes and intercooler hoses
Turbocharger wastegate actuator
Turbocharger assembly
Boost pressure sensor (MAP sensor)
Intercooler
Related Error Codes
P0171P0300P0420P0411P0441
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