AutoCodes – Chrysler – P0418 Chrysler

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

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. 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 Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
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.

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Code Popularity 8,892

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0418 Chrysler Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0418 Chrysler - Secondary Air Injection System Relay 'A' Circuit Malfunction - AutoCodes.com — P0418 Chrysler Code - Secondary Air Injection System Relay 'A' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0418 Chrysler?

Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection

How to Fix the DTC P0418 Chrysler?

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 P0418 Chrysler 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 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.