AutoCodes – Jeep – P0418 Jeep

P0418 Jeep 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 Jeep 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 4,901

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

What does this mean?

What are the Possible Causes of the DTC P0418 Jeep?

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 Jeep?

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 Jeep 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 Jeep Code

1. What are the common symptoms of OBDII code P0418 in a Jeep related to the Secondary Air Injection System Relay 'A' Circuit Malfunction?

- Common symptoms include illuminated Check Engine Light, rough idling, decreased engine performance, and potential stalling.

2. What can cause the OBDII code P0418 to trigger in a Jeep?

- Possible causes include a faulty secondary air injection system relay, damaged wiring or connectors, or a malfunctioning secondary air injection pump.

3. How serious is the OBDII code P0418 in a Jeep?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent further damage to the engine or emissions system.

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

- It is generally not recommended to drive the vehicle extensively with this code, as it can lead to decreased performance and potential engine issues.

5. How can I diagnose the OBDII code P0418 in my Jeep?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, followed by inspecting the secondary air injection system components and related wiring for any visible damage.

6. What are some repair tips for fixing the OBDII code P0418 in a Jeep?

- Repair may involve replacing the faulty secondary air injection system relay, repairing damaged wiring or connectors, or addressing issues with the secondary air injection pump.

7. Is it possible to reset the OBDII code P0418 in a Jeep without making any repairs?

- While you can clear the code temporarily, it is not recommended to reset it without addressing the underlying issue, as it is likely to reappear.

8. How much does it typically cost to repair the OBDII code P0418 in a Jeep?

- Repair costs can vary depending on the specific cause of the code, but it may range from $100 to $500 or more, including parts and labor.

9. Can a DIY enthusiast fix the OBDII code P0418 in a Jeep?

- Depending on the cause of the code, some DIY enthusiasts with automotive repair experience may be able to address the issue themselves by following repair guides or manuals.

10. How long does it take to repair the OBDII code P0418 in a Jeep?

- The repair time can vary based on the extent of the issue and the expertise of the person performing the repair, but it typically takes a few hours to a half-day to complete.