For Shop Owners

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

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Faulty Air Pump inoperative
  • Air bypass solenoid harness is open or shorted
  • Air bypass solenoid circuit poor electrical connection
What does this mean?

When is the code detected?

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

Possible symptoms

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

P0418 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 - Secondary Air Injection System Relay 'A' Circuit Malfunction - itimaster.ru

P0418 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 more help?

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P0418 Comments

Help us improve itimaster.ru. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0418 code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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