MasterTuning Fault code dictionary (DTC)

P0045 — Turbocharger boost control circuit

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe circuit controlling the turbo's variable geometry is not responding as expected. The fault is electrical or pneumatic, not necessarily in the turbine itself.
FamilyPowertrain (P)

Typical symptoms

Reduced power
Engine warning light on
Slow or absent turbo response

Common causes

Faulty control solenoid
Disconnected or cracked vacuum pipe
Seized electric actuator
Broken wiring

What to do

Usually an inexpensive repair: solenoid, pipe or actuator. It is worth cleaning the variable geometry as well, since the actuator often failed while forcing against carbon build-up.

Frequently asked questions

What does code P0045 mean?

Turbocharger boost control circuit. The circuit controlling the turbo's variable geometry is not responding as expected. The fault is electrical or pneumatic, not necessarily in the turbine itself.

Can I keep driving with code P0045 active?

With caution: limp mode possible, have it checked soon

Common causes — P0045

Faulty control solenoid Disconnected or cracked vacuum pipe Seized electric actuator Broken wiring

How do you fix code P0045?

Usually an inexpensive repair: solenoid, pipe or actuator. It is worth cleaning the variable geometry as well, since the actuator often failed while forcing against carbon build-up.

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