AutoCodes – Audi – P0240 Audi

P0240 Audi Code - Turbo/Super Charger Boost Sensor 'B' Circuit

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 Audi indicates Turbo/Super Charger Boost Sensor 'B' Circuit .
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 8,179
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0240 Audi 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 Audi - Turbo/Super Charger Boost Sensor 'B' Circuit  - AutoCodes.com
P0240 Audi Code - Turbo/Super Charger Boost Sensor 'B' Circuit

What are the Possible Causes of the DTC P0240 Audi?

  • 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 Audi?

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 Audi 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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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 Audi Code

1. What are common symptoms of OBDII code P0240 in an Audi related to the Turbo/Super Charger Boost Sensor 'B' Circuit?

- Common symptoms include reduced engine power, poor acceleration, and potential stalling.

2. What are some possible causes of OBDII code P0240 in an Audi?

- Causes can include a faulty boost sensor, damaged wiring or connectors, low boost pressure, or a malfunctioning turbocharger.

3. How can I diagnose the Turbo/Super Charger Boost Sensor 'B' Circuit issue in my Audi?

- Diagnosis typically involves using a scan tool to read the OBDII code, testing the boost sensor, checking the wiring for damage, and inspecting the turbocharger system.

4. Can driving with OBDII code P0240 in my Audi cause further damage?

- Continued driving with this code may lead to reduced engine performance and potential damage to the turbocharger system over time.

5. What are some repair tips for fixing OBDII code P0240 in an Audi?

- Repair tips may include replacing the boost sensor, repairing damaged wiring, ensuring proper boost pressure, and addressing any underlying turbocharger issues.

6. Is it safe to drive my Audi with OBDII code P0240 present?

- It is generally not recommended to drive with this code present, as it can impact engine performance and potentially lead to further issues if left unresolved.

7. How much does it typically cost to repair OBDII code P0240 in an Audi?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, especially if major components need replacement.

8. Can I reset the OBDII code P0240 in my Audi myself?

- While you can clear the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. Are there any maintenance tips to prevent OBDII code P0240 from appearing in my Audi?

- Regular maintenance, including checking the turbocharger system, monitoring boost pressure, and inspecting wiring connections, can help prevent this code from appearing.

10. How urgent is it to address OBDII code P0240 in an Audi?

- It is recommended to address this code promptly to prevent potential engine performance issues and further damage to the turbocharger system.

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