Turbo / BoostModerate ImpactDiesel & Petrol

P0299 — Turbocharger/Supercharger Underboost Condition

The measured boost pressure is significantly lower than the ECU-requested target. The ECU flags this as the turbo not delivering expected performance.

6+

Affected Brands

12+

ECU Platforms

4

Related Services

3

Related DTCs

Symptoms

What the driver typically experiences when P0299 is stored

!Check Engine Light
iReduced power / sluggish acceleration
iTurbo may feel unresponsive
!!Possible limp mode on some ECU platforms

Why does P0299 appear after tuning?

Appears when boost targets are raised beyond what the turbo can physically deliver, or when wastegate/VGT actuator calibration does not match the new targets. Can also indicate a mechanical issue.

How proper calibration can address P0299

WEREMAP tunes are calibrated to the specific turbo hardware. Boost targets are set within the realistic delivery range of the installed turbocharger.

Related Tuning Services

Relevant services for the system behind P0299

Stage 1Stage 2Stage 3DTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0299

P2262Moderate Impact

Diagnostic Trouble Code P2262

P0234High Impact

Turbocharger/Supercharger Overboost Condition

P0101Moderate Impact

Mass Air Flow (MAF) Sensor Range/Performance

Affected ECU Platforms

Marelli MM10JABosch MED17.2.2Bosch MED17.7.7Siemens/Continental SID309Bosch EDC17CP55Bosch EDC17C50Bosch MED17.5Bosch MG1CP002Bosch MED17.3.5Delphi CRD3Bosch EDC17C79Bosch EDC17C64

Commonly Affected Vehicles

MBCLABosch MG1CP002
HondaCivicKeihin TC1782
FerrariF8 Tributo / SpiderBosch MED17.3.5
Alfa RomeoGiuliaMarelli MM10JA
FordMondeoBosch MED17.2.2
Hondacivic turboKeihin unknown
HondaAccordKeihin 37805-6A1-H550
AudiA6Bosch EDC17CP44

Based on data from 6+ vehicle brands. P0299 is not limited to these models.

Frequently Asked Questions

What does P0299 mean?â–¼
The measured boost pressure is significantly lower than the ECU-requested target. The ECU flags this as the turbo not delivering expected performance.
Why does P0299 appear after ECU tuning?â–¼
Appears when boost targets are raised beyond what the turbo can physically deliver, or when wastegate/VGT actuator calibration does not match the new targets. Can also indicate a mechanical issue.
How do you prevent P0299 during remapping?â–¼
WEREMAP tunes are calibrated to the specific turbo hardware. Boost targets are set within the realistic delivery range of the installed turbocharger.
Which vehicles are affected by P0299?â–¼
P0299 is commonly found on MB, Honda, Ferrari, Alfa Romeo, Ford, Audi vehicles equipped with Marelli MM10JA, Bosch MED17.2.2, Bosch MED17.7.7, Siemens/Continental SID309 ECU platforms.
What other codes appear alongside P0299?â–¼
P0299 frequently appears together with P2262, P0234, P0101. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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