What does P0045 mean?
The turbo boost control solenoid or actuator controls how much boost the turbocharger makes, through a wastegate or variable vanes.
The computer tried to control the part and saw an electrical fault, usually an open circuit.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Low power or limp mode
- Overboost surging
Common causes
- Open circuit in the solenoid or its wiring
- Unplugged or corroded connector
- Blown fuse feeding the component
- Failed component
How to diagnose P0045
- Check the fuse that feeds the component.
- Measure the component's resistance and compare it with the service spec.
- Check for power at the connector with the key on, and for a broken control wire back to the computer.
- Command the actuator with a scan tool and watch it move.
- Check solenoid resistance and wiring.
How to fix it
- Replace the solenoid/actuator
- Repair wiring or vacuum lines
- Free up or repair the wastegate or vanes
Estimated repair cost
Likely repairs for P0045 run from about $150 to $1,800, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Wastegate/boost control solenoid | $150 - $500 |
| VGT actuator / vane service | $500 - $1,800 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0045?
Moderate severity
Drive gently. Overboost can damage the engine.
P0045 FAQ
What does P0045 mean?
P0045 stands for "Turbocharger/Supercharger Boost Control "A" Circuit/Open". The turbo boost control solenoid or actuator controls how much boost the turbocharger makes, through a wastegate or variable vanes.
Can I drive with a P0045 code?
Drive gently. Overboost can damage the engine.
How much does it cost to fix P0045?
It depends on the cause. The likely repairs for P0045 range from about $150 to $1,800 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0045?
The most common causes are: open circuit in the solenoid or its wiring; unplugged or corroded connector; blown fuse feeding the component.