Engine-CodesSaturn – P0412 Saturn

P0412 Saturn Code - Secondary Air Injection Solenoid Relay Control Circuit

Quick Answer

The P0412 diagnostic trouble code (DTC) for Saturn vehicles relates to the Secondary Air Injection Solenoid Relay Control Circuit. Common causes include Faulty secondary air injection solenoid relay, Damaged wiring or connectors in the relay control circuit, Corrosion or debris blocking the relay control circuit. 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 Saturn indicates Secondary Air Injection Solenoid Relay Control Circuit.
Common causes
Common causes include Faulty secondary air injection solenoid relay, Damaged wiring or connectors in the relay control circuit, Corrosion or debris blocking the relay control circuit.
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.
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0412 Saturn Description

The P0412 diagnostic trouble code (DTC) for Saturn vehicles relates to the Secondary Air Injection Solenoid Relay Control Circuit. This code indicates a malfunction in the circuit that controls the secondary air injection system in the vehicle. The secondary air injection system is an emissions control system that helps reduce harmful pollutants by injecting fresh air into the exhaust system to help burn off any remaining fuel before it exits the tailpipe.

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

Common Causes of P0412 Saturn

  1. Faulty secondary air injection solenoid relay
  2. Damaged wiring or connectors in the relay control circuit
  3. Corrosion or debris blocking the relay control circuit
  4. Issues with the powertrain control module (PCM)
  5. Electrical issues such as blown fuses or short circuits

Symptoms of P0412 Saturn

  1. Check engine light illuminated on the dashboard
  2. Reduced fuel efficiency
  3. Rough idling or stalling
  4. Increased emissions output
  5. Vehicle fails emissions tests

How to Fix P0412 Saturn

  1. Use an OBD-II scanner to confirm the presence of the P0412 code
  2. Inspect the secondary air injection solenoid relay and its wiring for any visible damage
  3. Test the relay control circuit for continuity and proper operation
  4. Replace the faulty relay, wiring, or connectors as needed
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved

Cost to Fix P0412 Saturn

The typical repair costs for addressing a P0412 code on a Saturn vehicle can range from $150 to $400, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates may also be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options. It's recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances.

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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