P0045Fuel & Air

Turbo/Super Boost Control Solenoid Circuit/Open

P0045 means the PCM detected an open or circuit fault in the turbocharger or supercharger boost control solenoid. Without proper solenoid control, the PCM cannot regulate boost accurately.

🚗 Limited. Boost control is affected, so the engine may run in a reduced-power mode until repaired.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty boost control solenoid$80-$300

35%

A failed solenoid coil breaks the control circuit.

#2Damaged wiring or connector$100-$300

30%

Open or chafed wiring interrupts the control signal.

#3Poor connector contact or corrosion$20-$100

20%

A dirty connector interrupts the solenoid circuit.

#4PCM output driver fault$500-$1200

15%

A failed driver cannot command the solenoid.

🩺 Common Symptoms

Reduced power or limp mode
Check engine light
Poor acceleration
Over or under boost
Increased fuel consumption

💰 Repair Cost: DIY vs Shop

DIY Cost

$20-$300

Shop Cost

$100-$1200

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0045

1Inspect the boost solenoid wiring and connector

2Measure solenoid resistance against spec

3Check for power and ground at the solenoid

4Command the solenoid with a scan tool and watch response

❓ Frequently Asked Questions

Can I drive with P0045?

For short trips, yes, but boost is limited and the engine may enter reduced power. Repair it soon to restore performance.

What does P0045 control?

It refers to the solenoid that regulates turbo or supercharger boost. An open circuit means the PCM cannot control boost accurately.

How much to fix P0045?

A replacement solenoid is $80-$300, and wiring repairs run $100-$300.

🔗 Related Codes

P0046P0234P0243P0245P0299