P004D

Turbocharger/Supercharger Boost Control B Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

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

Causes

Open or short circuit in wiring harness
Turbo control solenoid malfunction
Problems with the boost pressure sensor
Mechanical faults of the turbine or supercharger
ECU malfunction

How to Fix

Check wiring harness for damage
Check resistance and operation of control solenoid
Check boost pressure sensor
Inspect turbocharger mechanical components
If necessary, replace faulty components

Related codes

P004C P004E P0234