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Engine-Codes – Generic – P2403

P2403 Code - Evaporative Emission System Leak Detection Pump Sense Circuit/Open

Quick Answer

The P2403 code indicates a problem with the evaporative emission system leak detection pump sense circuit being open or disconnected. Common causes include Faulty Leak Detection Pump: A malfunctioning or failed leak detection pump can trigger the P2403 code, Open or Shorted Wiring: Issues with the wiring connected to the leak detection pump sense circuit can cause an open circuit and trigger the code, Corroded Connectors: Corrosion on the connectors related to the leak detection pump sense circuit can disrupt the circuit and trigger the code. 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
P2403 indicates Evaporative Emission System Leak Detection Pump Sense Circuit/Open.
Common causes
Common causes include Faulty Leak Detection Pump: A malfunctioning or failed leak detection pump can trigger the P2403 code, Open or Shorted Wiring: Issues with the wiring connected to the leak detection pump sense circuit can cause an open circuit and trigger the code, Corroded Connectors: Corrosion on the connectors related to the leak detection pump sense circuit can disrupt the circuit and trigger the code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P2403 Description

The P2403 code indicates a problem with the evaporative emission system leak detection pump sense circuit being open or disconnected. This system plays a crucial role in controlling the release of harmful emissions from the vehicle into the atmosphere. When this code is triggered, it means that the vehicle's onboard computer has detected a fault in the circuit that monitors the performance of the evaporative emission system.

OBDII Code P2403 - Evaporative Emission System Leak Detection Pump Sense Circuit/Open
P2403 Code - Evaporative Emission System Leak Detection Pump Sense Circuit/Open

Common Causes of P2403

  1. Faulty Leak Detection Pump: A malfunctioning or failed leak detection pump can trigger the P2403 code.
  2. Open or Shorted Wiring: Issues with the wiring connected to the leak detection pump sense circuit can cause an open circuit and trigger the code.
  3. Corroded Connectors: Corrosion on the connectors related to the leak detection pump sense circuit can disrupt the circuit and trigger the code.
  4. Evaporative Emission System Leak: An actual leak in the evaporative emission system can also trigger the code, as the system is unable to properly pressurize and monitor for leaks.

Symptoms of P2403

  1. Check Engine Light: The most common symptom associated with the P2403 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning evaporative emission system can lead to decreased fuel efficiency as fuel vapors may not be properly controlled.
  3. Strong Fuel Smell: If there is a leak in the evaporative emission system, you may notice a strong fuel smell around the vehicle.
  4. Rough Idle: A malfunctioning evaporative emission system can also cause the engine to idle roughly or inconsistently.

How to Fix P2403

  1. Diagnose the Issue: Use a OBD-II scanner to retrieve the code and perform a visual inspection of the evaporative emission system components and wiring.
  2. Check Wiring and Connectors: Inspect the wiring and connectors related to the leak detection pump sense circuit for any signs of damage or corrosion. Repair or replace as needed.
  3. Test Leak Detection Pump: Test the operation of the leak detection pump to ensure it is functioning correctly. Replace if necessary.
  4. Clear Codes: Clear the diagnostic trouble codes from the vehicle's computer using the OBD-II scanner.
  5. Perform a Road Test: After repairing the issue, perform a road test to ensure the code does not return and the vehicle operates normally.

Cost to Fix P2403

The typical repair costs for addressing a P2403 code can vary depending on the specific cause of the issue. In general, the cost of parts for replacing a leak detection pump or repairing wiring/connectors can range from $100 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair bill can range from $200 to $500 or more, depending on the extent of the repairs needed. It's important to note that labor rates and parts costs can vary based on factors such as location, vehicle make and model, and the specific diagnosis and repair process required. It's advisable to consult with a trusted mechanic or auto repair shop to obtain a more accurate estimate for addressing the P2403 code in your vehicle.

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Code P2403 Information for Specific Makes

  • P2403 Dodge — Evaporative Emission System Leak Detection Pump Sense Circuit/Open
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 P2403 Code

1. What are the common symptoms of OBDII code P2403?

The common symptoms of code P2403 include the illumination of the Check Engine Light (CEL) on the dashboard, decreased fuel efficiency, and potential difficulty starting the vehicle.

2. What causes OBDII code P2403 to trigger?

Code P2403 is typically triggered by a fault in the evaporative emission system's leak detection pump sense circuit, often due to a damaged or malfunctioning leak detection pump or issues with the wiring or connections in the circuit.

3. How serious is OBDII code P2403?

While OBDII code P2403 may not cause immediate drivability issues, it is important to address this problem promptly as it relates to the vehicle's emissions control system. Ignoring the code can lead to increased emissions and potential long-term damage to the engine or catalytic converter.

4. Can I continue driving with OBDII code P2403 present?

It is generally safe to drive the vehicle with code P2403, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any further damage to the emissions system and ensure continued efficient operation of the vehicle.

5. How can I diagnose OBDII code P2403?

Diagnosing code P2403 involves using a diagnostic scanner to retrieve the specific code, followed by a thorough inspection of the evaporative emission system components, including the leak detection pump, hoses, and electrical connections, to identify the root cause of the issue.

6. What are some repair tips for resolving OBDII code P2403?

Repairing code P2403 may involve replacing the leak detection pump, repairing damaged wiring or connections in the sense circuit, and clearing the code from the vehicle's computer system. It is advisable to consult a professional mechanic for an accurate diagnosis and repair.

7. Can a DIY enthusiast fix OBDII code P2403 at home?

While some DIY enthusiasts may have the skills to address code P2403, it is recommended to seek professional help for diagnosing and repairing this issue, especially when it involves components of the vehicle's evaporative emission system that require specialized knowledge and tools.

8. How much does it typically cost to repair OBDII code P2403?

The cost of repairing code P2403 can vary depending on the root cause of the issue, the extent of the damage, and the labor rates in your area. On average, you can expect to pay anywhere from $100 to $500 for parts and labor.

9. What happens if I ignore OBDII code P2403?

Ignoring code P2403 can lead to increased emissions from the vehicle, potential failures in emissions tests, decreased fuel efficiency, and long-term damage to the engine or catalytic converter. It is best to address the issue promptly to avoid these consequences.

10. Can resetting the Check Engine Light resolve OBDII code P2403?

Simply resetting the Check Engine Light without diagnosing and repairing the root cause of code P2403 will not resolve the underlying issue. The light may temporarily go off, but the code is likely to reappear until the problem is fixed.

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