P0045
Turbocharger/Supercharger Boost Control A Circuit/Open
Forced induction (turbo/super)
Generic OBD-II
High
What it means
P0045 means the engine control module has detected an open circuit in the "A" turbo/supercharger boost-control solenoid — the wiring, connector, or solenoid coil isn't completing the circuit. With no control over the wastegate or boost solenoid, the system usually limits boost for safety, so the engine feels flat and down on power.
High
Can I keep driving? Drivable but noticeably down on power and likely in a reduced-boost limp mode; no immediate danger, but fix it to restore performance.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power and acceleration
- Reduced-power / limp mode
- Little or no boost
- Reduced fuel economy
Common causes
Most likely first
- Open or broken wiring / bad connector at the boost-control solenoid (most common for an Open code)Likely
- Failed boost-control solenoid coilCommon
- Corroded or disconnected connectorCommon
- Blown fuse or poor groundLess often
- Failed ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Scan and record freeze-frame data.
- Inspect the boost solenoid connector and wiring for an open or break.
- Measure the solenoid coil's resistance against spec.
- Confirm the solenoid has power and a good ground.
- Replace the solenoid if the coil is open; consider the ECM last. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0045?+
Yes, but the engine will feel flat and is likely limiting boost for safety. There's no immediate danger — it just won't make full power until repaired.
Can I just clear P0045?+
It returns immediately because the circuit is open. You need to find the broken wire, connector, or failed solenoid first.
Related codes
Often seen with P0045
Read & clear P0045 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX