Engine-Codes - Generic - P0418

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

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

|P0418 code possible causes

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

|How is the P0418 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0418 code

Labor: 1.0

The cost to diagnose the P0418 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0418 code detected?

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

|What are P0418 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

|What is P0418 code meaning?

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.

|Need more information with the P0418 code?

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|P0418 code information for specific makes

  • P0418 AUDI Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 BUICK Secondary Air Injection Pump Relay Control Circuit
  • P0418 CADILLAC Secondary Air Injection Pump Relay Control Circuit
  • P0418 CHEVROLET Secondary Air Injection Pump Relay Control Circuit
  • P0418 CHRYSLER Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 DODGE Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 GMC Secondary Air Injection Pump Relay Control Circuit
  • P0418 ISUZU Secondary Air Injection Pump Control Circuit
  • P0418 JEEP Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 LEXUS Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 MERCEDES-BENZ Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 PONTIAC Secondary Air Injection Pump Relay Control Circuit
  • P0418 SATURN Secondary Air Injection Pump Relay Control Circuit
  • P0418 SUBARU Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 TOYOTA Secondary Air Injection System Relay 'A' Circuit Malfunction
  • P0418 VOLKSWAGEN Secondary Air Injection System Relay 'A' Circuit Malfunction

|Need help with a P0418 code?

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