Supercharger Bypass Actuator Circuit Open
2006-2011 BMW 325i 3.0L I6 N52 🇨🇦
Description
The supercharger bypass actuator that controls airflow around the supercharger for efficiency is not responding due to an open circuit.
Symptoms
- Check Engine Light
- Supercharger always pumping air (no bypass)
- Higher parasitic load on engine
- Reduced fuel economy at cruise
- Supercharger whine present at all times
Common Causes
- Bypass actuator motor open circuit
- Wiring harness disconnected
- Connector pin backed out
- Actuator failed internally
- PCM driver circuit blown
Diagnostic Steps
- Test bypass actuator motor resistance
- Check wiring continuity to actuator
- Inspect connector for backed-out pins
- Command actuator via scan tool
- Measure PCM output voltage at actuator
Repair Notes
Replace supercharger bypass actuator or repair wiring. Verify bypass operates correctly at low load conditions.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3034 on Other Vehicles
Common Questions
What does code P3034 mean on a 2006-2011 BMW 325i?
P3034 stands for "Supercharger Bypass Actuator Circuit Open". The supercharger bypass actuator that controls airflow around the supercharger for efficiency is not responding due to an open circuit.
What are the symptoms of P3034 on a BMW 325i?
Common symptoms of P3034 include: Check Engine Light, Supercharger always pumping air (no bypass), Higher parasitic load on engine, Reduced fuel economy at cruise, Supercharger whine present at all times.
What causes P3034 on a 2006-2011 BMW 325i?
Common causes of P3034 include: Bypass actuator motor open circuit, Wiring harness disconnected, Connector pin backed out, Actuator failed internally, PCM driver circuit blown.