P0045 Code – Turbocharger/Supercharger Boost Control Solenoid Circuit/Open
P0045 is an OBD-II generic diagnostic trouble code indicating that the Engine Control Module (ECM) has detected an open circuit or malfunction in the turbocharger/supercharger boost control solenoid circuit.
Code Meaning
P0045 – Turbocharger/Supercharger Boost Control Solenoid Circuit/Open
Symptoms
- Check Engine Light (MIL) illuminated.
- Loss of engine power.
- Poor acceleration.
- Reduced or no turbo boost.
- Vehicle may enter limp mode.
- Increased fuel consumption.
Possible Causes
- Faulty boost control solenoid.
- Open circuit in the solenoid wiring.
- Loose, damaged, or corroded electrical connector.
- Blown fuse.
- Faulty ECM (rare).
Component Location
The boost control solenoid is typically mounted near the turbocharger or on the engine and controls boost pressure by regulating vacuum or pressure to the wastegate actuator.
How to Diagnose
- Confirm P0045 with an OBD-II scan tool.
- Inspect the boost control solenoid connector and wiring.
- Check the solenoid resistance with a digital multimeter.
- Verify battery voltage and ground at the solenoid.
- Test the solenoid using a scan tool or direct activation.
- Inspect related vacuum hoses for damage.
Common Repairs
- Replace the boost control solenoid.
- Repair open or damaged wiring.
- Clean or replace electrical connectors.
- Replace a blown fuse.
- Clear the DTC and perform a road test.
Can You Drive with P0045?
Yes, but engine performance may be significantly reduced due to improper boost control. Repair should be performed as soon as possible.
Related OBD-II Codes
- P0046 – Turbocharger/Supercharger Boost Control Solenoid Circuit Range/Performance
- P0047 – Turbocharger/Supercharger Boost Control Solenoid Circuit Low
- P0048 – Turbocharger/Supercharger Boost Control Solenoid Circuit High
- P0234 – Engine Overboost Condition
- P0299 – Turbocharger Underboost Condition