AutoCodes – Isuzu – P0412 Isuzu

P0412 Isuzu Code - Secondary Air Injection Solenoid Control Circuit

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 Isuzu indicates Secondary Air Injection Solenoid Control Circuit.
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 4,600

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
FAQs
Comments
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Code P0412 Isuzu 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 Isuzu - Secondary Air Injection Solenoid Control Circuit - AutoCodes.com — P0412 Isuzu Code - Secondary Air Injection Solenoid Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0412 Isuzu?

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 Isuzu?

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 Isuzu 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.

Need more information about the P0412 Isuzu code?

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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.

Frequently Asked Questions about P0412 Isuzu Code

1. What are the common symptoms of OBDII code P0412 in an Isuzu related to the Secondary Air Injection Solenoid Control Circuit?

- Common symptoms include rough idling, engine hesitation, decreased fuel efficiency, and the illumination of the check engine light.

2. What can cause the OBDII code P0412 to trigger in an Isuzu?

- The code P0412 is typically triggered by a malfunction in the secondary air injection solenoid control circuit, which may be caused by a faulty solenoid, damaged wiring, or a poor electrical connection.

3. How serious is the OBDII code P0412 in an Isuzu?

- While the symptoms of code P0412 can impact engine performance, they do not usually pose an immediate threat to the vehicle's drivability. However, it is recommended to address the issue promptly to prevent further damage.

4. Can I continue driving my Isuzu with the OBDII code P0412 present?

- It is generally safe to drive the vehicle with the code P0412, but it is advisable to have the issue diagnosed and repaired as soon as possible to prevent any potential long-term damage to the engine.

5. What are some DIY repair tips for fixing OBDII code P0412 in an Isuzu?

- DIY repair tips may include visually inspecting the wiring and connections associated with the secondary air injection solenoid, checking for any visible damage or corrosion, and ensuring a secure electrical connection.

6. How can I reset the check engine light after repairing OBDII code P0412 in my Isuzu?

- The check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, it is essential to ensure that the underlying issue causing the code has been addressed before resetting the light.

7. Is it necessary to replace the secondary air injection solenoid to fix OBDII code P0412 in an Isuzu?

- In some cases, replacing the faulty solenoid may be necessary to resolve the code P0412. However, it is recommended to diagnose the issue accurately to determine if the solenoid is the root cause or if other components are contributing to the problem.

8. How much does it typically cost to repair OBDII code P0412 in an Isuzu at a professional mechanic?

- The cost of repairing code P0412 can vary depending on the extent of the issue, the labor rates of the mechanic, and the cost of any replacement parts. On average, the repair cost may range from $100 to $300.

9. Can a clogged secondary air injection system cause OBDII code P0412 in an Isuzu?

- Yes, a clogged secondary air injection system can disrupt the proper operation of the solenoid control circuit and trigger code P0412. Regular maintenance and cleaning of the system can help prevent such issues.

10. Will OBDII code P0412 cause my Isuzu to fail an emissions test?

- Yes, the presence of code P0412 in the OBDII system may cause your Isuzu to fail an emissions test due to the impact on the secondary air injection system's efficiency. It is recommended to address the issue before undergoing an emissions test.