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P0418 Chrysler Code - Secondary Air Injection System Relay 'A' Circuit Malfunction

Quick Answer

The P0418 Chrysler diagnostic trouble code indicates a malfunction in the Secondary Air Injection System Relay 'A' circuit. Common causes include Faulty Relay: A malfunctioning relay in the secondary air injection system can trigger this code, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the relay circuit, Control Module Failure: A failure in the control module that manages the secondary air injection system can cause this code to appear. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0418 Chrysler indicates Secondary Air Injection System Relay 'A' Circuit Malfunction.
Common causes
Common causes include Faulty Relay: A malfunctioning relay in the secondary air injection system can trigger this code, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the relay circuit, Control Module Failure: A failure in the control module that manages the secondary air injection system can cause this code to appear.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0418 Chrysler Description

The P0418 Chrysler diagnostic trouble code indicates a malfunction in the Secondary Air Injection System Relay 'A' circuit. This system is responsible for reducing emissions by injecting fresh air into the exhaust system to help burn off any remaining fuel before it exits the tailpipe. When the relay circuit malfunctions, it can affect the efficiency of this process, leading to increased emissions and potential damage to the catalytic converter.

OBDII Code P0418 Chrysler - Secondary Air Injection System Relay 'A' Circuit Malfunction
P0418 Chrysler Code - Secondary Air Injection System Relay 'A' Circuit Malfunction

Common Causes of P0418 Chrysler

  1. Faulty Relay: A malfunctioning relay in the secondary air injection system can trigger this code.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the relay circuit.
  3. Control Module Failure: A failure in the control module that manages the secondary air injection system can cause this code to appear.
  4. Vacuum Leaks: Leaks in the vacuum lines that control the secondary air injection system can also trigger this code.

Symptoms of P0418 Chrysler

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Rough Idle: The engine may experience rough idling or hesitation during acceleration.
  3. Decreased Fuel Efficiency: A malfunctioning secondary air injection system can lead to decreased fuel efficiency.
  4. Increased Emissions: The vehicle may fail an emissions test due to increased emissions output.

How to Fix P0418 Chrysler

  1. Diagnose the Issue: Use a diagnostic tool to retrieve the specific fault code and pinpoint the issue within the secondary air injection system.
  2. Inspect Wiring and Connections: Check the wiring harness and connections for any signs of damage, corrosion, or poor connections.
  3. Test Relay: Test the relay for proper function and replace it if necessary.
  4. Check Control Module: Inspect the control module for any signs of failure and replace if needed.
  5. Clear Codes: After completing the repair, clear the fault codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0418 Chrysler

The cost of repairing a P0418 Chrysler code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this issue can range from $150 to $500, including parts and labor. It's important to note that rates at auto repair shops can vary, so it's recommended to obtain a few quotes from different shops in your area to get a more accurate estimate.

When is the Code Detected?

The DTC P0418 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.

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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 P0418 Chrysler Code

1. What are the common symptoms of OBDII code P0418 in a Chrysler vehicle?

- Common symptoms include the Check Engine Light illuminating, rough idling, decreased engine performance, and possible issues with emissions testing.

2. What could cause the OBDII code P0418 related to the Secondary Air Injection System Relay 'A' Circuit malfunction in a Chrysler?

- The code P0418 is often triggered by a faulty secondary air injection system relay, damaged wiring or connectors, or a malfunctioning secondary air injection pump.

3. How can I diagnose the cause of OBDII code P0418 in my Chrysler?

- Diagnosing the issue involves checking the secondary air injection system relay, inspecting the wiring and connectors for damage, testing the secondary air injection pump, and scanning for any other related fault codes.

4. Can I continue driving my Chrysler with OBDII code P0418 present?

- It is not recommended to ignore the code and continue driving, as it can lead to further damage to the secondary air injection system and potentially affect the vehicle's performance and emissions.

5. How can I repair OBDII code P0418 in my Chrysler?

- Repair options may include replacing the secondary air injection system relay, repairing damaged wiring or connectors, or replacing the secondary air injection pump if necessary.

6. Are there any DIY tips for troubleshooting OBDII code P0418 in a Chrysler?

- DIY tips may include checking the relay and its connections, inspecting wiring for damage, and ensuring proper operation of the secondary air injection pump.

7. Will resetting the Check Engine Light clear OBDII code P0418 in a Chrysler?

- Resetting the Check Engine Light may temporarily clear the code, but it will likely return if the underlying issue with the secondary air injection system is not addressed.

8. How important is it to fix OBDII code P0418 promptly in a Chrysler?

- It is important to address the issue promptly to prevent further damage to the secondary air injection system, ensure proper vehicle performance, and maintain compliance with emissions regulations.

9. Can a malfunctioning secondary air injection system affect fuel efficiency in a Chrysler?

- Yes, a malfunctioning secondary air injection system can affect fuel efficiency by disrupting the air-fuel mixture and combustion process in the engine.

10. Is it possible to prevent OBDII code P0418 from occurring in a Chrysler?

- Regular maintenance, including checking and replacing worn components of the secondary air injection system, can help prevent the occurrence of code P0418 in a Chrysler.

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