P0045 — Turbocharger/Supercharger Boost Control "A" Circuit/Open
Category: Powertrain Severity: Medium
Updated:
DTC code P0045 means: Turbocharger/Supercharger Boost Control "A" Circuit/Open. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include failed boost control solenoid (e.g. N75), faulty electronic turbo actuator and open connector or wiring; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Failed boost control solenoid (e.g. N75)
- Faulty electronic turbo actuator
- Open connector or wiring
- Blown fuse
Symptoms
- Limp mode (reduced power)
- Lack of power
- Check engine light
- No boost
How to diagnose it step by step
- Inspect the solenoid/actuator connector and wiring.
- Measure its resistance.
- Check supply with the ignition on.
- Command the component with a scan tool.
- Replace the faulty part.
How to fix it
Measure the boost control solenoid or turbo actuator resistance and check its connector. On many VW Group diesels the fault is the N75 valve or the electronic turbo actuator.
Estimated repair cost
Solenoid: $40–150. Electronic turbo actuator: $300–900.
Frequently asked questions
What does DTC code P0045 mean?
Turbocharger/Supercharger Boost Control "A" Circuit/Open.
Is code P0045 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0045?
You can drive with reduced power, without pushing the engine.
Related codes
P0046 P0038 P0037 P0036 P0031 P0030 P0068 P0021 P0019 P0018
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