P1566 Power To A/C Clutch Circuit Overcurrent

How to Diagnose and Solve P1566 Power To A/C Clutch Circuit Overcurrent Issues

As a seasoned car expert, I understand the frustration that comes with encountering a P1566 Power To A/C Clutch Circuit Overcurrent issue. This problem can be a real headache, but don’t worry, I’m here to help you diagnose and solve it.

Understanding the P1566 Code

Firstly, it’s crucial to understand what the P1566 code means. This code indicates that there’s an overcurrent issue in the power supply to your car’s air conditioning (A/C) clutch circuit. This could be due to a variety of reasons, such as a faulty A/C clutch relay, a short circuit, or even a damaged A/C compressor clutch.

Signs of a P1566 Code

Before we dive into the diagnosis and solution, let’s identify the signs that your car might be experiencing this issue. These include:

– The A/C system not cooling effectively
– The A/C clutch not engaging
– The Check Engine Light coming on

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Diagnosing the P1566 Code

Now that we’ve identified the signs, let’s move on to diagnosing the problem.

Step 1: Check the A/C Clutch Relay

The A/C clutch relay is a common culprit for this issue. Use a multimeter to check if the relay is functioning correctly. If it’s not, replace it.

Step 2: Inspect the Wiring and Connectors

Inspect the wiring and connectors for any signs of damage or corrosion. If you find any, repair or replace them as necessary.

Step 3: Test the A/C Compressor Clutch

If the relay and wiring are in good condition, the problem might lie with the A/C compressor clutch. Test it using a test light or multimeter. If it’s faulty, you’ll need to replace it.

Solving the P1566 Code

After diagnosing the problem, it’s time to solve it.

Step 1: Replace the Faulty Parts

Replace any faulty parts you identified during the diagnosis. This could be the A/C clutch relay, the wiring, or the A/C compressor clutch.

Step 2: Clear the Code

After replacing the faulty parts, use an OBD-II scanner to clear the P1566 code from your car’s computer.

Step 3: Test the A/C System

Finally, test the A/C system to ensure it’s working correctly. If it is, congratulations! You’ve successfully solved the P1566 code issue.


Dealing with a P1566 Power To A/C Clutch Circuit Overcurrent issue can be daunting, but with the right knowledge and tools, you can diagnose and solve it yourself. Remember, always take safety precautions when working on your car and don’t hesitate to seek professional help if needed.


1. What causes a P1566 code?

A P1566 code is usually caused by a faulty A/C clutch relay, damaged wiring, or a defective A/C compressor clutch.

2. Can I drive my car with a P1566 code?

While it’s possible to drive with a P1566 code, it’s not recommended as it can lead to further damage to your A/C system.

3. How can I prevent a P1566 code?

Regular maintenance and inspection of your car’s A/C system can help prevent a P1566 code. Always ensure the A/C clutch relay, wiring, and A/C compressor clutch are in good condition.