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.

Real-world scan data

Seen in

1,604

scans in the past year

Found in

0.2%

of scans

0.5%

of scans that found faults

Appears alongside · share of P0045 scans

P0380in 19.7% of scans

P0113in 18.1% of scans

P0201in 15.8% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0045 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX