Medium severity
P004BIncorrect operation of the turbocharger boost control circuit
Part
Boost solenoid
Part price
$50
At a workshop
$100
You save
$50
How to read code P004B
P
System
Powertrain (engine and transmission)
0
Code type
Generic code (SAE / OBD-II)
0
Subsystem
General system / auxiliary measurement
4B
Fault number
Specific fault within the subsystem
Symptoms
- Power fluctuation during acceleration
- Occasional fault mode activation
- Stored diagnostic trouble code in the ECM
Possible causes
- Bent turbine geometry
- Weak boost solenoid
- Low boost pressure in the system
Diagnostic steps
- 1Inspect the turbine shaft for fluid flow
- 2Check the boost pump and valves
- 3Perform dynamic logs of boost pressure
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Frequently asked questions about P004B
What does code P004B mean?
P004B: Incorrect operation of the turbocharger boost control circuit.
What are the symptoms of code P004B?
Power fluctuation during acceleration; Occasional fault mode activation; Stored diagnostic trouble code in the ECM.
What causes code P004B?
Bent turbine geometry; Weak boost solenoid; Low boost pressure in the system.
Can I drive with code P004B?
SAFE TO DRIVE – The fault does not immobilise the car, but diagnose it as soon as possible.
How much does it cost to fix code P004B?
The part (Boost solenoid) costs about $50, and a mechanic’s labour about $50.
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