Turbo/Supercharger Boost Sensor B Circuit (Bank 2)
The P0240 code means the vehicle's onboard diagnostic system has detected: Turbo/Supercharger Boost Sensor B Circuit (Bank 2). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P0240?
- Check Engine Light on
- Bank 2 turbo boost reduced
- Power loss from Bank 2 cylinders
- Possible limp mode on twin-turbo systems
What Causes P0240? (Most Likely First)
- Faulty Bank 2 turbo boost sensor Very High
- Wiring damage to Bank 2 boost sensor High
- Boost leak on Bank 2 intake tract Moderate
- PCM circuit fault for Bank 2 Low
Can I Still Drive with P0240?
Short distances only. P0240 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is the Bank 2 boost sensor?
On twin-turbo engines, each turbocharger has its own boost sensor. The Bank 2 sensor monitors boost pressure from the turbo serving Bank 2 cylinders.
Can I drive a twin-turbo with P0240?
You can drive short distances, but the PCM may limit Bank 2 boost, resulting in uneven power delivery and reduced overall performance.
Is P0240 different from P0236?
P0236 refers to boost sensor B in general. P0240 specifically indicates the boost sensor circuit for the Bank 2 turbocharger on twin-turbo engines.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0240?
-
Read Bank 2 boost sensor PID on scan tool. Compare to Bank 1 at idle (should be equal at atmospheric).
-
Inspect Bank 2 boost sensor connector and wiring for damage.
-
Pressure-test Bank 2 intake tract for boost leaks.
-
Measure sensor output voltage and compare to Bank 1 sensor.
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 P0240?
- 2010-2020 Ford F-150 (3.5L EcoBoost)
- 2012-2019 BMW 535i (3.0T twin-turbo)
- 2008-2018 Audi S4 (3.0T)
- 2011-2020 Mercedes-Benz E400 (3.0T)
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.