P3004high severityPowertrain
Turbo/Supercharger Wastegate Actuator Stuck Open
on 2019 Audi A6 2.0L Turbo I4 · AWD
What this code means
The wastegate actuator is stuck in the open position, preventing the turbo from building proper boost pressure.
Symptoms
- Check Engine Light
- No boost pressure
- Significant loss of power
- Engine feels naturally aspirated
- Poor acceleration at all speeds
Common causes
- Wastegate actuator rod seized
- Actuator diaphragm ruptured
- Wastegate valve carbon buildup
- Vacuum line disconnected
- Actuator linkage broken
Diagnostic steps
- Check wastegate actuator vacuum line
- Manually operate wastegate actuator rod
- Inspect actuator diaphragm for leaks
- Check for carbon deposits on wastegate valve
- Verify boost pressure with gauge
Repair notes
Replace wastegate actuator. Clean carbon from wastegate valve and housing. Check turbo shaft play.
🔌 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