AutoCodes – Ford – P0412 Ford

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

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0412 Ford indicates Secondary Air Injection System Switching Valve 'A' Circuit Malfunction.
Common causes: Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 9,660

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0412 Ford 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 Ford - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction - AutoCodes.com — P0412 Ford Code - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0412 Ford?

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

How to Fix the DTC P0412 Ford?

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 P0412 Ford 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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Information for Specific Ford Models

P0412 1997 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 1998 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 1999 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 2000 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 2001 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 2002 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction
P0412 2003 Ford F150 — Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

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.