P2402 – Audi DTC

Audi DTC P2402 – Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue

DTC P2402 meaning on Audi

DTC P2402 refers to a malfunction in the Evaporative Emission Control System, specifically indicating a failure in the leak detection pump. This system is responsible for detecting leaks in the fuel vapor system, which is crucial for reducing emissions. The Powertrain Control Module (PCM) monitors the performance of the leak detection pump and triggers this code when it detects a fault.

Audi DTC P2402 symptoms

Common symptoms associated with DTC P2402 may include:

• Check Engine Light illuminated
• Failed emissions test
• Decreased fuel efficiency
• Unusual fuel odor

Audi DTC P2402 causes

The causes of DTC P2402 can include:

• Faulty leak detection pump
• Powertrain Control Module (PCM) failure
• Wiring issues, such as damaged or corroded connectors
• Vacuum leaks in the evaporative system
• Faulty pressure sensor

Audi DTC P2402 seriousness

DTC P2402 is considered a moderate to serious issue. While it may not cause immediate drivability problems, it can lead to increased emissions and potential failure in emissions testing. Ignoring this code can result in further damage to the evaporative system and may lead to costly repairs.

How to diagnose DTC P2402 on Audi

To diagnose DTC P2402, follow these steps:

1. Use an OBD-II scanner to confirm the DTC and check for any additional codes.
2. Inspect the leak detection pump for physical damage or signs of wear.
3. Check the wiring and connectors for corrosion or breaks.
4. Test the operation of the leak detection pump using a multimeter.
5. Inspect the evaporative system for vacuum leaks.
6. Verify the functionality of the PCM and its connections.

How to fix DTC P2402 on Audi step-by-step instructions

To fix DTC P2402, follow these steps:

1. Clear the DTC using an OBD-II scanner.
2. Replace the leak detection pump if it is found to be faulty.
3. Repair or replace any damaged wiring or connectors.
4. Fix any vacuum leaks in the evaporative system.
5. Test the pressure sensor and replace it if necessary.
6. Recheck the system for leaks and ensure proper operation.
7. Clear the DTC again and take the vehicle for a test drive to confirm the issue is resolved.

How to erase DTC P2402 on Audi

To erase DTC P2402, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the codes.
5. Disconnect the scanner and start the engine to verify that the code does not return.

Recommended tools for Audi diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.