Turbo/Supercharger Boost Sensor B Circuit Low (Bank 2)
The P0241 code means the vehicle's onboard diagnostic system has detected: Turbo/Supercharger Boost Sensor B Circuit Low (Bank 2). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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What Are the Symptoms of P0241?
- Check Engine Light illuminated
- Bank 2 turbo boost disabled
- Significant power loss
- Engine may run rough under load
What Causes P0241? (Most Likely First)
- Short to ground in Bank 2 boost sensor wiring Very High
- Failed Bank 2 boost sensor (shorted) High
- Corroded connector on Bank 2 Moderate
- PCM input fault Low
Can I Still Drive with P0241?
Short distances only. P0241 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What happens when Bank 2 boost is disabled?
The engine will run on Bank 1 turbo only (or at reduced power), resulting in a noticeable loss of acceleration and top-end power.
Is P0241 specific to twin-turbo engines?
Yes, P0241 is specific to the Bank 2 boost sensor circuit on engines with separate turbochargers for each bank.
Can water splash cause P0241?
Yes, road water entering the sensor connector can short the signal to ground. Ensure connector seals are intact.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0241?
-
Read Bank 2 boost sensor voltage. Below 0.3V at key-on engine-off confirms low circuit.
-
Disconnect sensor and check for short to ground on signal wire.
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Inspect connector for moisture or corrosion.
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With sensor disconnected, verify 5V reference is present at the connector.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0241?
- 2010-2020 BMW 740i (3.0T twin-turbo)
- 2012-2019 Mercedes-Benz S550 (4.7T twin-turbo)
- 2008-2018 Audi A8 (4.0T twin-turbo)
- 2011-2020 Porsche Panamera (2.9T twin-turbo)
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