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P0412 Cadillac Code - Secondary Air Injection Solenoid Relay Control Circuit

Quick Answer

The P0412 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Secondary Air Injection Solenoid Relay Control Circuit. Common causes include Faulty Secondary Air Injection Solenoid Relay: A malfunctioning solenoid relay can cause the control circuit to fail, triggering the P0412 code, Wiring Issues: Damaged or corroded wiring in the control circuit can prevent proper communication between components, leading to a fault, Blown Fuse: A blown fuse in the secondary air injection system can cause the solenoid relay control circuit to malfunction. 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 Cadillac indicates Secondary Air Injection Solenoid Relay Control Circuit.
Common causes
Common causes include Faulty Secondary Air Injection Solenoid Relay: A malfunctioning solenoid relay can cause the control circuit to fail, triggering the P0412 code, Wiring Issues: Damaged or corroded wiring in the control circuit can prevent proper communication between components, leading to a fault, Blown Fuse: A blown fuse in the secondary air injection system can cause the solenoid relay control circuit to malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0412 Cadillac Description

The P0412 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Secondary Air Injection Solenoid Relay Control Circuit. This code indicates that there is a malfunction in the control circuit for the secondary air injection system, which is responsible for injecting fresh air into the exhaust system to help reduce emissions.

OBDII Code P0412 Cadillac - Secondary Air Injection Solenoid Relay Control Circuit
P0412 Cadillac Code - Secondary Air Injection Solenoid Relay Control Circuit

Common Causes of P0412 Cadillac

  1. Faulty Secondary Air Injection Solenoid Relay: A malfunctioning solenoid relay can cause the control circuit to fail, triggering the P0412 code.
  2. Wiring Issues: Damaged or corroded wiring in the control circuit can prevent proper communication between components, leading to a fault.
  3. Blown Fuse: A blown fuse in the secondary air injection system can cause the solenoid relay control circuit to malfunction.
  4. ECM/PCM Failure: A failure in the engine control module or powertrain control module can also result in the P0412 DTC.

Symptoms of P0412 Cadillac

  1. Check Engine Light: The most common symptom associated with the P0412 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine performance, such as rough idling, hesitation, or a lack of power.
  3. Increased Emissions: A malfunctioning secondary air injection system can lead to increased emissions output, which may cause the vehicle to fail emissions tests.
  4. Poor Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to the improper operation of the secondary air injection system.

How to Fix P0412 Cadillac

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a visual inspection of the secondary air injection system components.
  2. Check Wiring and Connections: Inspect the wiring and connections in the solenoid relay control circuit for any damage or corrosion.
  3. Test the Solenoid Relay: Test the secondary air injection solenoid relay to determine if it is functioning correctly.
  4. Replace Faulty Components: Replace any faulty components, such as the solenoid relay or damaged wiring, to resolve the issue.
  5. Clear DTC and Test Drive: Clear the DTC from the vehicle's memory using a scan tool, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0412 Cadillac

The typical repair costs for addressing the P0412 code on a Cadillac vehicle can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, dealership rates may be higher, while independent shops may offer more competitive pricing.

When is the Code Detected?

If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the code P0412 to set.

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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.

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