What are the common causes of P0045?

An open in the boost control A circuit. A failed boost control A solenoid. Corrosion at the boost control A connector. Chafed wiring along the boost control A harness. A failed ECM driver for boost control A.

Inspect the boost control A connector and wiring for an open. Measure the boost control A solenoid resistance. Check the control circuit for voltage with the key on. Command the boost control A solenoid and listen for it to cycle. Replace the boost control A solenoid if it does not respond. Clear the code and retest.

P0045

Turbocharger/Supercharger Boost Control A Circuit/Open

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0045 means Turbocharger/Supercharger Boost Control A Circuit/Open.

Check these first

An open in the boost control A circuit
A failed boost control A solenoid
Corrosion at the boost control A connector
Chafed wiring along the boost control A harness
A failed ECM driver for boost control A

What to do next

Inspect the boost control A connector and wiring for an open
Measure the boost control A solenoid resistance
Check the control circuit for voltage with the key on
Command the boost control A solenoid and listen for it to cycle
Replace the boost control A solenoid if it does not respond
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.