P004F

Turbocharger/Supercharger Boost Control B Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced engine power
Unstable engine operation
Increased fuel consumption
Check Engine indicator on the dashboard

Causes

Open or short circuit in control circuit wiring harness
Boost control solenoid malfunction
Damage or contamination of the boost pressure sensor
Turbocharger/supercharger mechanical problems
Problems with vacuum hoses or connections

How to Fix

Check the wiring harness and connections in the boost control circuit
Test boost control solenoid
Check boost pressure sensor
Inspect vacuum hoses and connections
Check the mechanical condition of the turbocharger/supercharger

Related codes

P004E P0234 P0236 P0299