AutoCodes – Cadillac – P1418 Cadillac

P1418 Cadillac 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 Cadillac 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 3,371

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1418 Cadillac 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 Cadillac - Secondary Air Injection System Relay 'A' Control Circuit High - AutoCodes.com — P1418 Cadillac Code - Secondary Air Injection System Relay 'A' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P1418 Cadillac?

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 Cadillac?

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 Cadillac 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.