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AutoCodes - Generic - P0412

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

- Code Popularity: 39,109 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0412?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Air Pump inoperative
  • Air bypass solenoid harness is open or shorted
  • Air bypass solenoid circuit poor electrical connection
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How to Fix the DTC P0412?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0412 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.

What are Code Possible Symptoms?

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

Code 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.

OBDII Code P0412 - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction - AutoCodes.com
P0412 Code - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

Need More Information on the Code?

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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

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Code P0412 comments

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