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P1566 Lincoln Code - Speed Control Command Switch Out of Range Low

Quick Answer

The P1566 diagnostic trouble code (DTC) for Lincoln vehicles specifically indicates that the speed control command switch is out of range low. Common causes include Faulty speed control command switch, Damaged wiring or connectors in the cruise control system, Malfunctioning cruise control module. 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
P1566 Lincoln indicates Speed Control Command Switch Out of Range Low.
Common causes
Common causes include Faulty speed control command switch, Damaged wiring or connectors in the cruise control system, Malfunctioning cruise control module.
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 10, 2024
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Code P1566 Lincoln Description

The P1566 diagnostic trouble code (DTC) for Lincoln vehicles specifically indicates that the speed control command switch is out of range low. This means that the vehicle's onboard computer has detected a discrepancy in the input signals from the speed control command switch, which is used to set and adjust the vehicle's speed control system, commonly known as cruise control. When the switch is determined to be out of range low, it means that the signal being sent by the switch is below the expected or acceptable range. This can lead to issues with the vehicle's cruise control functionality, affecting the system's ability to maintain a set speed and potentially causing erratic behavior during operation.

OBDII Code P1566 Lincoln - Speed Control Command Switch Out of Range Low
P1566 Lincoln Code - Speed Control Command Switch Out of Range Low

Common Causes of P1566 Lincoln

  1. Faulty speed control command switch
  2. Damaged wiring or connectors in the cruise control system
  3. Malfunctioning cruise control module
  4. Sticking throttle causing incorrect speed readings
  5. Software or programming issues within the vehicle's computer system

Symptoms of P1566 Lincoln

  1. Inoperative cruise control system
  2. Erratic behavior when cruise control is engaged
  3. Illumination of the check engine light
  4. Reduced fuel efficiency due to lack of cruise control functionality

How to Fix P1566 Lincoln

  1. Begin by conducting a thorough visual inspection of the cruise control system components, including the speed control command switch, wiring, and connectors.
  2. Use a diagnostic scan tool to retrieve the specific trouble code and further investigate the root cause of the issue.
  3. Test the speed control command switch and related components for proper functionality and replace any faulty parts as needed.
  4. Clear the DTC from the vehicle's computer system and perform a test drive to ensure that the cruise control system is operating correctly.
  5. If the issue persists, consider consulting a professional mechanic or dealership for further assistance in diagnosing and repairing the problem.

Cost to Fix P1566 Lincoln

The typical repair costs for addressing a P1566 code related to the speed control command switch out of range low can vary depending on the specific cause of the issue and the labor rates in your area. In general, you can expect to pay anywhere from $100 to $300 for parts and labor to resolve this problem. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get a quote from a local mechanic or dealership for a more accurate estimate.

When is the Code Detected?

The Engine Control Module (ECM) has detected a fault in the cruise control circuit

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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 P1566 Lincoln Code

1. What are the common symptoms of OBDII code P1566 in a Lincoln vehicle?

- Common symptoms include the speed control system not functioning properly, the cruise control not engaging, and the speed control light on the dashboard illuminating.

2. What typically causes the OBDII code P1566 in a Lincoln vehicle?

- The most common cause of this code is a faulty speed control command switch, which is responsible for sending signals to the vehicle's powertrain control module.

3. How can I diagnose the issue related to the OBDII code P1566 in my Lincoln vehicle?

- A thorough inspection of the speed control command switch and its wiring for any visible damage or corrosion is a good starting point. Additionally, using a diagnostic scan tool to read the trouble code and check for any other related codes can help pinpoint the issue.

4. Can I continue driving my Lincoln with the P1566 trouble code?

- While the vehicle may still be drivable with this code, it is not recommended to ignore it, as it can affect the proper functioning of the speed control system. Getting it diagnosed and repaired promptly is advisable.

5. Are there any simple repair tips for resolving the OBDII code P1566 in a Lincoln vehicle?

- In some cases, simply cleaning the speed control command switch contacts or replacing the switch itself can resolve the issue. However, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.

6. Is the repair for the P1566 trouble code in a Lincoln vehicle typically expensive?

- The cost of repair can vary depending on the exact cause of the code and the labor rates in your area. In many cases, replacing the speed control command switch is a relatively straightforward and affordable repair.

7. Can I reset the OBDII code P1566 in my Lincoln vehicle by disconnecting the battery?

- Disconnecting the battery may temporarily clear the trouble code, but it is not a recommended long-term solution. The underlying issue causing the code will still need to be addressed to prevent it from reoccurring.

8. Will the OBDII code P1566 cause my Lincoln vehicle to fail an emissions test?

- Depending on the regulations in your area, a stored trouble code like P1566 may cause your vehicle to fail an emissions test. It is advisable to have the issue diagnosed and repaired before undergoing an emissions test.

9. Can extreme weather conditions affect the triggering of the OBDII code P1566 in a Lincoln vehicle?

- Extreme temperatures or moisture exposure can potentially affect the speed control command switch and lead to the P1566 trouble code. Keeping the switch and its connections well-protected can help prevent issues.

10. Is it possible for a DIY enthusiast to repair the OBDII code P1566 in a Lincoln vehicle?

- While some simple repairs like replacing the speed control command switch may be within reach for DIY enthusiasts, accurately diagnosing the issue and ensuring proper repair may require professional expertise. Consulting a qualified mechanic is recommended for a thorough diagnosis and repair.

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