P0248moderate severityPowertrain
Turbocharger/Supercharger Boost Control B Circuit Range/Performance
on 2003 Audi A6 3.0L V6 · AWD
What this code means
The PCM detected that the boost control 'B' circuit is out of its expected range or not performing correctly. This usually points to a wastegate or boost solenoid issue.
Symptoms
- Reduced engine power
- Check engine light on
- Poor acceleration
Common causes
- Faulty boost control solenoid
- Wastegate actuator problem
- Wiring or connector fault
- Vacuum/boost hose leak
Diagnostic steps
- Scan for related boost codes
- Inspect boost control solenoid and wiring
- Check wastegate operation and vacuum lines
- Test actuator response with scan tool
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