P004B

Turbocharger/Supercharger Boost Control B Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–222 (est.)

Symptoms

Reduced engine power
Unstable engine operation
Increased fuel consumption
Check Engine Light Illuminates

Causes

Turbine control solenoid malfunction
Open or short circuit in wiring harness
Mechanical problems of the turbocharger
Leaks in the boost system
Boost pressure sensor malfunction
Problems with vacuum lines

How to Fix

Check the condition of the wiring harness and connectors
Check the operation of the turbine control solenoid
Inspect the turbocharger for mechanical damage
Check the system for air leaks
Check boost pressure sensor
Check vacuum lines for integrity

Related codes

P004A P004C P0299