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AutoCodes – Generic – P0240

P0240 Code - Turbocharger/Supercharger Boost Sensor 'B' Circuit Range/Performance

Quick Answer

The boost pressure sensor responds to pressure changes in the intake manifold. Common causes include Boost pressure sensor harness is open or shorted, Boost pressure sensor circuit poor electrical connection, Faulty boost pressure sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0240 indicates Turbocharger/Supercharger Boost Sensor 'B' Circuit Range/Performance.
Common causes
Common causes include Boost pressure sensor harness is open or shorted, Boost pressure sensor circuit poor electrical connection, Faulty boost pressure sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 25,910
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0240 Description

The boost pressure sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with accelerator pedal position (APP) and engine speed. The Engine Control Module (ECM) uses this information to assist in diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The Engine Control Module (ECM) supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit, and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost pressure sensor signal for voltage outside of the normal range. The ECM calculates a predicted value for the boost pressure sensor. The ECM then compares the predicted value to the actual signal.
OBDII Code P0240 - Turbocharger/Supercharger Boost Sensor 'B' Circuit Range/Performance - AutoCodes.com
P0240 Code - Turbocharger/Supercharger Boost Sensor 'B' Circuit Range/Performance
What does this mean?

What are the Possible Causes of the DTC P0240?

  • Boost pressure sensor harness is open or shorted
  • Boost pressure sensor circuit poor electrical connection
  • Faulty boost pressure sensor
  • Faulty Turbo/Super Charger
  • Engine over temperature
  • Ignition misfire exceeds the calibrated threshold
  • Faulty Knock sensor (KS)

How to Fix the DTC P0240?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0240 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0240 Code

No Frequently Asked Questions about P0240 Code found.

Discuss the causes and fixes for P0240 OBDII Code

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  • Can be a turbo boost leak?

    Reply to Comment

  • Yes, a leak on the turbo boost can cause a change of pressure and the boost pressure sensor readings.

    Reply to Comment

  • THis was helpful. THe BPS (or MAP) is cracked. THis is the only code stored. I bought the part haven't installed it yet -- and it should work.

    Reply to Comment

  • I have P0240 code in ford focus 2012, please let me know how can i fix it. Thanks

    Reply to Comment

  • Can a dirty boost pressure sensor cause this?

    Reply to Comment

  • It's not common, but it's possible. What model and year is your vehicle?

    Reply to Comment
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