How does a fault code arise in the Turbo and Boost Pressure group?
The turbo group is about raising intake air above atmospheric pressure: the turbocharger, the wastegate or variable geometry (VNT) actuator, the control solenoid, the intercooler and the boost pressure sensor.
The control unit calculates a target boost pressure for every operating point and compares the measured pressure against it. Most codes here say either “target not reached” or “target exceeded”. The first is typically a leak — hose, clamp, intercooler — or a stuck actuator or fouled VNT vanes; the second usually concerns control itself, that is, the actuator and solenoid.
Because boost codes can only occur under load, the vehicle may look completely normal at idle. In this group the engine load and rpm stored in the freeze frame are the shortest route to reproducing the fault deliberately.
Fault codes in this group
The database holds 6 codes in this group. Each code has its own page with the meaning, possible causes and diagnostic steps:
Read fault codes on your own vehicle
With an ELM327-based BLE OBD2 adapter, CarCoding reads confirmed, pending and permanent fault codes separately, pulls the freeze frame and explains every code in plain language. Clearing codes is done from the app as well. The app is free to download.
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Data source: the CarCoding fault code database. Code definitions follow the SAE J2012 standard; manufacturers may use different wording for their own codes. Everything on this page is generated from the code-specific database records.