P241F

Turbocharger/Supercharger Boost Control B Circuit Low

P241F is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control B Circuit Low. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P241F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
Need P241F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P241F means

DTC P241F is set when the PCM detects a lower-than-expected voltage or current on the boost control B actuator or solenoid circuit. Unlike the performance fault P240F, this is a hard electrical fault indicating the circuit voltage has fallen below the minimum expected level. This typically points to a short to ground in the solenoid wiring, an internally shorted solenoid coil, or a loss of supply voltage to the boost control B circuit.

Boost control solenoids on turbocharged engines are duty-cycle controlled by the PCM to regulate actuator position and therefore compressor outlet pressure. When the solenoid circuit reads low, the PCM loses accurate control authority over turbocharger B and may default the boost target to a safe reduced level, resulting in noticeably reduced engine power.

Diagnosis should follow a structured electrical approach: verify supply voltage, check for shorts to ground in the signal or return wiring, measure solenoid resistance, and confirm the PCM output is functioning. Wiring harness damage near the turbocharger is common due to heat and vibration exposure.

Common causes

Most-frequently reported root causes when P241F is logged.

  • 1
    Short to ground in the boost control solenoid B signal or return wire.
  • 2
    Internally shorted boost control solenoid B coil.
  • 3
    Damaged wiring harness near the turbocharger exposed to heat cycling.
  • 4
    Corroded or shorted terminals at the boost control solenoid B connector.
  • 5
    PCM boost control B output driver failure.
  • 6
    Blown fuse or relay in the solenoid B supply circuit.

Symptoms drivers notice

MIL illuminated with P241F stored.
Noticeable loss of engine power due to reduced or absent boost on circuit B.
Possible blown fuse in the boost control solenoid supply circuit.
Possible accompanying P240F or boost pressure low codes.
No boost from turbocharger B in severe cases.

How to diagnose P241F

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and determine whether other boost or turbocharger codes are present.
  2. 2
    Check the fuse and any relay in the boost control solenoid B supply circuit.
  3. 3
    Inspect the solenoid B connector and nearby wiring harness for heat damage, chafing, or shorts.
  4. 4
    Measure supply voltage at the solenoid B connector with ignition on.
  5. 5
    Disconnect the solenoid and measure coil resistance; compare to specification to check for internal short.
  6. 6
    With the solenoid disconnected, check whether the low voltage condition on the control wire persists to locate any harness short.
  7. 7
    Repair wiring faults or replace the solenoid, then verify operation and clear DTCs.

Vehicles where we've handled P241F

Platforms in our catalogue with confirmed P241F coverage.

BMW 320D
2016

Related powertrain codes

Frequently asked questions

What is the difference between P241F and P240F?

P241F is a hard electrical circuit low fault, meaning the voltage measured on the circuit is below the acceptable minimum. P240F is a performance fault where the electrical signal is in range but the boost pressure response does not match the command.

Can turbocharger heat damage cause P241F?

Yes. Wiring routed near the turbocharger housing is subject to heat degradation over time, which can cause insulation breakdown and shorts to ground that set P241F.

Will the engine run without fixing P241F?

The engine will typically run in a reduced boost or limp mode, but performance will be significantly degraded and the underlying short can cause further electrical damage if not repaired promptly.

Is it possible for the PCM itself to cause P241F?

An internal PCM driver failure for the boost B output can cause this code, but it is uncommon compared to external wiring and solenoid faults. Confirm all external components are within specification before suspecting the PCM.

Disabling P241F in software

RaceTune can permanently disable P241F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P241F disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch EDC17C50 verified 1 software version
  • Bosch EDC17CP09 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got P241F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file