Nissan ASCD Switch: Unraveling the P1564 Code

If you own a Nissan vehicle and have encountered error code P1564, you’re not alone. This diagnostic trouble code can be frustrating, but fear not! In this comprehensive guide, we will delve into the causes, diagnosis, and fixes for Error Code P1564 in Nissan vehicles. By the end of this article, you’ll have a clear understanding of what triggers this code and how to resolve it.

Understanding Error Code P1564

What is Error Code P1564?

Error Code P1564 in Nissan vehicles is related to the Automatic Speed Control Device (ASCD) steering switch. This error code is primarily associated with the malfunction of the ASCD steering switch circuit. The ASCD system is responsible for maintaining a constant vehicle speed, and any issues with it can lead to this error code.

Causes of Error Code P1564

To effectively diagnose and fix Error Code P1564, it’s crucial to understand its possible causes:

1. Faulty ASCD Steering Switch

One of the most common reasons for this error code is a malfunctioning ASCD steering switch. Over time, these switches can wear out or become damaged, leading to communication problems with the vehicle’s engine control module (ECM).

2. Wiring Issues

Faulty wiring or loose connections in the ASCD steering switch circuit can also trigger Error Code P1564. Damaged wires or poor connections can disrupt the communication between the switch and the ECM.

3. ECM Malfunction

In some cases, the ECM itself may be faulty, causing issues with the ASCD steering switch circuit. However, this is a less common cause.

Diagnosing Error Code P1564

Now that we’ve explored the potential causes, let’s discuss how to diagnose this error code:

1. OBD-II Scanner

The first step in diagnosing Error Code P1564 is to use an OBD-II scanner to retrieve the trouble codes stored in your vehicle’s ECM. This will confirm the presence of P1564 and provide additional codes if any.

2. Visual Inspection

Inspect the ASCD steering switch and its wiring for any visible damage. Look for loose connections or exposed wires that may be causing the issue.

3. Circuit Testing

Perform circuit testing using a multimeter to check for continuity and proper voltage in the ASCD steering switch circuit. This will help pinpoint any wiring issues.

4. ECM Testing

If all else fails, consider testing the ECM itself. This should be done by a qualified technician as it involves advanced diagnostic equipment.

Fixing Error Code P1564

Once you’ve identified the root cause of Error Code P1564, you can proceed with the necessary fixes:

1. Replace the ASCD Steering Switch

If the ASCD steering switch is found to be faulty, replace it with a new, OEM (Original Equipment Manufacturer) part. This should resolve the issue and clear the error code.

2. Repair Wiring Issues

If the issue lies in the wiring or connections, repair or replace the damaged wires and ensure all connections are secure.

3. ECM Replacement (if necessary)

In rare cases where the ECM is malfunctioning, it may need to be replaced or reprogrammed by a certified technician.


Error Code P1564 in Nissan vehicles can be frustrating, but with a systematic approach to diagnosis and the right fixes, you can resolve it effectively. Whether it’s a faulty ASCD steering switch or wiring issues, addressing the root cause will get your vehicle back on the road smoothly.

Frequently Asked Questions (FAQs)

  1. What does Error Code P1564 mean in my Nissan vehicle? Error Code P1564 indicates a problem with the Automatic Speed Control Device (ASCD) steering switch circuit, affecting your vehicle’s speed control system.
  2. Can I drive my Nissan with Error Code P1564? It’s not recommended to drive your vehicle with this error code, as it can affect speed control. It’s best to diagnose and fix the issue promptly.
  3. How much does it cost to repair Error Code P1564 in a Nissan vehicle? The cost of repair varies depending on the exact cause of the issue. Replacing the ASCD steering switch or repairing wiring may have different price points.
  4. Can I fix Error Code P1564 myself? If you have experience with automotive repairs and access to the necessary tools, you may be able to fix it yourself. However, it’s advisable to consult a professional for an accurate diagnosis and repair.
  5. Is it safe to clear Error Code P1564 without fixing the issue? Clearing the error code without addressing the underlying problem may temporarily eliminate the warning, but it won’t fix the issue. It’s essential to resolve the root cause to ensure the proper functioning of your vehicle.

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