What it means
The boost pressure sensor B circuit signal is below the calibrated threshold. This can result from a circuit fault or a failed sensor.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Boost pressure sensor B measures pressure in the turbocharger or supercharger air path and sends a signal to the control module. P0241 sets when that signal falls below the calibrated threshold, which can result from a short to ground, a poor connection, or a failed sensor.
Common causes
Most likely first.
- Signal wire shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
How to diagnose it
- Review freeze-frame data and boost sensor B live data to see whether the signal was low continuously or only under particular conditions.
- Inspect boost sensor B's connector and wiring for chafing, exposed conductors, corrosion, loose pins, or signs of a short to ground.
- Check that the sensor is correctly mounted and that its pressure port is not blocked or damaged.
- Using the manufacturer's circuit procedure, test the sensor signal wire for a short to ground and check terminal contact.
- If the wiring is sound, test boost sensor B against the manufacturer's specifications before replacing it.
Common fixes
- Repair chafed wiring or a signal wire shorted to ground.
- Clean or repair corroded connector terminals and restore proper pin contact.
- Clear a blocked sensor port or correct a loose sensor mounting.
- Replace boost sensor B if its signal remains below specification with a verified circuit.
Can I keep driving?
With reduced power or limp mode, avoid hard acceleration, towing, and high-speed driving because boost control may be limited. Stop if the vehicle cannot keep up safely with traffic or develops heavy smoke.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.