P0046moderate severityPowertrain
Turbo/Supercharger Boost Control Solenoid Circuit Range/Performance
on 1998 Audi A6 2.8L V6 · AWD
What this code means
The boost control solenoid is not responding within expected parameters.
Symptoms
- Check Engine Light
- Overboosting or underboosting
- Reduced power
- Surging
Common causes
- Sticking solenoid
- Vacuum leak
- Wastegate stuck
- Boost pressure sensor fault
Diagnostic steps
- Monitor boost pressure vs commanded
- Test solenoid operation
- Check vacuum lines
- Inspect wastegate
Repair notes
Replace solenoid or repair wastegate.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Bluetooth code reader (~$25)
Veepeak OBDCheck BLE →
Pairs with your phone — reads and clears codes, live data.
Serious DIY (~$100)
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
Shop-grade tablet (~$300+)
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
00532
Supply Voltage B+ Signal too Low
16394
Camshaft/Crankshaft Position Correlation Bank 1
16395
Camshaft Position Actuator Circuit/Open Bank 1
16486
Mass or Volume Air Flow Circuit Low Input
16487
Mass or Volume Air Flow Circuit High Input
16500
Engine Coolant Temperature Circuit Malfunction
16501
Engine Coolant Temperature Circuit Low Input
16502
Engine Coolant Temperature Circuit High Input
16514
O2 Sensor Circuit Bank 1 Sensor 1
16515
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1