P004A: The turbocharger boost control B has a broken or disconnected wire
The turbocharger boost control B has a broken or disconnected wire. It is usually a broken wire, a loose connector or the part itself.
| Code | P004A |
|---|---|
| System | Engine and transmission |
| Group | P00xx, Air, fuel and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P004A with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P004A with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0046 Boost control solenoid: range or performance
- P0047 Boost control solenoid: circuit low
- P0048 Boost control solenoid: circuit high
- P0049 Turbocharger or supercharger turbine overspeed
- P004B The turbocharger boost control B gives readings outside the normal range
- P004C The turbocharger boost control B gives a lower signal than normal
- P004D The turbocharger boost control B gives a higher signal than normal
- P004E The turbocharger boost control A fails now and then
- P0010 Camshaft A actuator control: open circuit (bank 1)
- P0011 Camshaft A timing over-advanced (bank 1)
- P0012 Camshaft A timing over-retarded (bank 1)
- P0013 Camshaft B actuator control: open circuit (bank 1)
What does code P004A mean?
The turbocharger boost control B has a broken or disconnected wire. It is usually a broken wire, a loose connector or the part itself.
How do you clear P004A?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P004A comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
