AutoCodes – Chevrolet – P1418 Chevrolet

P1418 Chevrolet Code - Secondary Air Injection System Relay 'A' Control Circuit High

Quick Answer

A Secondary Air Injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Secondary Air Injection (AIR) System Relay, Secondary Air Injection System Relay harness is open or shorted, Secondary Air Injection System Relay circuit poor electrical connection. 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: P1418 Chevrolet indicates Secondary Air Injection System Relay 'A' Control Circuit High.
Common causes: Common causes include Faulty Secondary Air Injection (AIR) System Relay, Secondary Air Injection System Relay harness is open or shorted, Secondary Air Injection System Relay circuit poor electrical connection.
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.

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Code Popularity 4,927

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1418 Chevrolet Description

A Secondary Air Injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) supplies a ground to the AIR pump relay, which energizes the AIR pump. The PCM monitors the HO2S voltages to diagnose the AIR system. During the AIR test, the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors the HO2S voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.

OBDII Code P1418 Chevrolet - Secondary Air Injection System Relay 'A' Control Circuit High - AutoCodes.com — P1418 Chevrolet Code - Secondary Air Injection System Relay 'A' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P1418 Chevrolet?

Faulty Secondary Air Injection (AIR) System Relay
Secondary Air Injection System Relay harness is open or shorted
Secondary Air Injection System Relay circuit poor electrical connection

How to Fix the DTC P1418 Chevrolet?

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 P1418 Chevrolet 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 P1418 Chevrolet Code

What does the P1418 code mean on a Chevrolet?

The P1418 code indicates an issue with the Secondary Air Injection System Relay 'A' Control Circuit, specifically that the circuit is reading a high voltage condition.

What are the common symptoms of the P1418 code?

Symptoms may include an illuminated Check Engine Light, poor engine performance, increased emissions, and possibly a failed emissions test.

What causes the P1418 code to appear?

Common causes include a faulty secondary air injection relay, damaged wiring or connectors in the relay circuit, or a malfunctioning air pump.

Can I drive my Chevrolet with the P1418 code?

While you can drive with this code, ignoring it may lead to increased emissions, reduced fuel efficiency, and potential damage to the emission system over time.

How is the P1418 code diagnosed?

A mechanic will use an OBDII scanner to confirm the code, inspect the secondary air injection system wiring and relay, and test the air pump for proper operation.

How do you fix the P1418 code on a Chevrolet?

Repairs may include replacing the faulty relay, repairing or replacing damaged wiring, or replacing the air pump if it's malfunctioning.

What tools are needed to fix the P1418 code?

Basic tools like a multimeter for testing voltage, an OBDII scanner for diagnostics, and possibly replacement parts such as the relay or air pump.

How much does it cost to fix the P1418 code?

Repair costs can vary but typically range from $100 to $400, depending on whether the issue is with the relay, wiring, or air pump.

Can a bad battery cause the P1418 code?

A weak or failing battery can cause electrical issues, but the P1418 code is more likely due to a problem specific to the secondary air injection system.

How do I prevent the P1418 code from occurring again?

Regular maintenance, including inspecting the secondary air injection system and ensuring all wiring and connections are secure, can help prevent this code.