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P0412 - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What does this mean?
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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? What does this mean?
When is the code detected?
The DTC P0412 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
P0412 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.

P0412 Information for specific makes
P0412 AUDI Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 BUICK Secondary Air Injection Solenoid Relay Control Circuit
P0412 CADILLAC Secondary Air Injection Solenoid Relay Control Circuit
P0412 CHEVROLET Secondary Air Injection Solenoid Relay Control Circuit
P0412 CHRYSLER Secondary Air Injection Switchover Solenoid Circuit
P0412 DODGE Secondary Air Injection Switchover Solenoid Circuit
P0412 FORD Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 GMC Secondary Air Injection Solenoid Relay Control Circuit
P0412 ISUZU Secondary Air Injection Solenoid Control Circuit
P0412 JEEP Secondary Air Injection Switchover Solenoid Circuit
P0412 LEXUS Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 MERCEDES-BENZ Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 PONTIAC Secondary Air Injection Solenoid Relay Control Circuit
P0412 SATURN Secondary Air Injection Solenoid Relay Control Circuit
P0412 TOYOTA Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 VOLKSWAGEN Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
Related Questions
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Repair Importance Level: 2
 
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