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Engine-Codes – Hyundai – P1674 Hyundai

P1674 Hyundai Code - A/C Fan Relay Malfunction

Quick Answer

The P1674 code for Hyundai vehicles indicates a malfunction in the A/C fan relay. Common causes include Faulty A/C fan relay, Electrical wiring issues, Blown fuse related to the A/C fan. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1674 Hyundai indicates A/C Fan Relay Malfunction.
Common causes
Common causes include Faulty A/C fan relay, Electrical wiring issues, Blown fuse related to the A/C fan.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1674 Hyundai Description

The P1674 code for Hyundai vehicles indicates a malfunction in the A/C fan relay. The A/C fan relay is a crucial component of the air conditioning system in a vehicle. It is responsible for controlling the operation of the A/C fan, which helps regulate the temperature inside the vehicle by dissipating heat generated by the A/C system.

OBDII Code P1674 Hyundai - A/C Fan Relay Malfunction
P1674 Hyundai Code - A/C Fan Relay Malfunction

Common Causes of P1674 Hyundai

  1. Faulty A/C fan relay
  2. Electrical wiring issues
  3. Blown fuse related to the A/C fan
  4. A/C fan motor failure
  5. Corrosion or damage to A/C fan relay connectors

Symptoms of P1674 Hyundai

  1. Lack of cooling in the vehicle's interior
  2. A/C system not blowing cold air
  3. A/C fan not turning on or operating intermittently
  4. Unusual noises coming from the A/C system
  5. A/C system overheating

How to Fix P1674 Hyundai

  1. Begin by diagnosing the specific cause of the A/C fan relay malfunction using a diagnostic tool.
  2. Inspect the A/C fan relay, wiring, and connectors for any visible damage or corrosion.
  3. Test the A/C fan relay and associated components to determine if they are functioning properly.
  4. Replace the faulty A/C fan relay or any other damaged components.
  5. Clear the diagnostic trouble codes and test the A/C system to ensure proper operation.

Cost to Fix P1674 Hyundai

The typical repair cost for addressing a P1674 code related to the A/C fan relay malfunction can range from $150 to $300, including parts and labor. However, it is essential to note that the actual cost may vary depending on the specific diagnosis time and labor rates at auto repair shops. Rates can be influenced by factors such as the vehicle's make and model, the location of the repair shop, and the type of engine. It is advisable to check with local auto repair shops for a more accurate estimate.

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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 P1674 Hyundai Code

1. What does the OBDII code P1674 mean on a Hyundai?

The P1674 code indicates an A/C Fan Relay Malfunction, meaning the relay controlling the air conditioning fan is not operating as expected.

2. What are the common symptoms of the P1674 code on a Hyundai?

Symptoms may include the A/C fan not working, poor air conditioning performance, overheating during A/C operation, or the Check Engine Light being illuminated.

3. What causes the P1674 code to appear on a Hyundai?

Common causes include a faulty A/C fan relay, damaged wiring or connectors, a blown fuse, or issues with the ECM not properly signaling the relay.

4. Can I still drive my Hyundai with the P1674 code present?

While you may be able to drive, ignoring the code can lead to overheating or reduced air conditioning performance, especially in hot weather.

5. How do I diagnose the P1674 code on a Hyundai?

Diagnose by checking the A/C fan relay, inspecting related wiring and connectors, verifying fuse integrity, and confirming ECM operation.

6. How can I fix the P1674 code on my Hyundai?

Repair options include replacing the faulty relay, repairing or replacing damaged wiring, or addressing ECM issues if the relay and wiring are functioning properly.

7. How much does it cost to repair the P1674 code on a Hyundai?

Repair costs vary, but replacing the A/C fan relay typically costs between $20 and $50 for parts, plus labor if done at a shop.

8. Can a bad A/C fan relay cause my Hyundai to overheat?

Yes, if the A/C fan relay fails, the cooling system may struggle during A/C operation, potentially causing the engine to overheat.

9. Will clearing the P1674 code solve the problem in my Hyundai?

Clearing the code without addressing the underlying issue will only temporarily remove the error; the code will return if the malfunction persists.

10. Is the P1674 code specific to Hyundai vehicles?

While P1674 may appear in other vehicles, its definition as an A/C Fan Relay Malfunction is specific to Hyundai models.

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