Faulty boost pressure sensor B (internal failure or contamination); Damaged, chafed or shorted sensor wiring (signal wire shorted to ground or open circuit); Corroded, loose or damaged connector at the sensor or control unit; Fault in the sensor reference voltage supply or ground circuit; Blocked, split or disconnected sensor vacuum or pressure hose, where fitted to the sensor design; Internal fault in the engine control unit.

P0241

Turbocharger/Supercharger Boost Sensor B Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
41: FaultThe specific fault in that area

What it means

P0241 means the engine control unit has seen the signal from boost pressure sensor B (the second turbocharger or supercharger boost sensor) fall below its expected electrical range. This points to a fault in the sensor circuit, such as a short to ground, an open circuit or a failed sensor, rather than a true low boost condition. The control unit may switch to a reduced boost strategy to protect the engine.

Symptoms

Engine warning light on
Noticeable loss of power or sluggish acceleration
Car may enter limp mode with limited boost
Poor or uneven throttle response
Increased fuel consumption
Possible black or grey smoke under load

Possible causes

Faulty boost pressure sensor B (internal failure or contamination)likely
Damaged, chafed or shorted sensor wiring (signal wire shorted to ground or open circuit)likely
Corroded, loose or damaged connector at the sensor or control unitlikely
Fault in the sensor reference voltage supply or ground circuitpossible
Blocked, split or disconnected sensor vacuum or pressure hose, where fitted to the sensor designpossible
Internal fault in the engine control unitrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting engine load, rpm and any other boost or pressure sensor codes
Identify which sensor is 'B' for this model and engine, using the manufacturer's wiring diagram, as the layout varies
Visually inspect the sensor, its connector and the wiring loom for chafing, heat damage, oil contamination, corrosion or bent pins
Check live data for the sensor reading with the ignition on and engine off, and compare it with ambient pressure and with the other boost or barometric sensor
Wiggle-test the wiring and connector with live data displayed to see if the reading drops out
Measure the sensor reference voltage and ground at the connector against the specification for the model
Test the signal wire for continuity and for a short to ground between the sensor and control unit
Inspect any hoses or pipes feeding the sensor, then clear the code and road test to see if it returns

How to fix

Replace the boost pressure sensor B if it reads out of range or fails the electrical tests
Repair or replace damaged wiring, correcting any short to ground or open circuit
Clean, repair or replace a corroded or damaged connector and terminals
Restore the correct reference voltage or ground supply by repairing the affected circuit
Replace any blocked, split or loose sensor hose or pipe
Only after all other causes are ruled out, diagnose and replace or repair the control unit as the manufacturer specifies

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but power will probably be reduced and it should be repaired soon. Avoid heavy loads or hard acceleration, since incorrect boost control could risk engine or turbocharger damage.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.