Turbo/Super Charger Boost Control Solenoid Circuit Open
The P0045 code means the vehicle's onboard diagnostic system has detected: Turbo/Super Charger Boost Control Solenoid Circuit Open. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $600 (parts and labor)
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Common Symptoms
- Check Engine Light on
- No turbo boost or reduced boost
- Significant loss of engine power
- Engine may enter limp mode
Probable Causes (Ranked by Likelihood)
- Failed boost control solenoid Very High
- Open circuit in solenoid wiring High
- Disconnected connector at boost solenoid Moderate
- ECM/PCM output driver failure Low
Step-by-Step Diagnostic Procedure
-
Confirm P0045 with scan tool and review freeze frame data
-
Inspect boost control solenoid connector for disconnection or damage
-
Test wiring continuity between ECM and boost control solenoid
-
Measure solenoid coil resistance
Frequently Asked Questions
What does P0045 mean?
P0045 means the ECM has detected an open circuit in the turbo or supercharger boost control solenoid circuit, preventing proper boost pressure regulation.
Can I still drive with P0045?
You can drive short distances, but the vehicle will have significantly reduced power. The engine may enter limp mode to protect the turbo system.
How is P0045 repaired?
The most common repair is replacing the boost control solenoid or repairing broken wiring in the solenoid circuit. Costs range from $200 to $600.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0045 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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