Description of DTC P0568
OBD2 Error Codes

P0568 Cruise control system speed signal malfunction

26.05.2022 /

P0568 – OBD-II Trouble Code Technical Description

Trouble code P0568 indicates that the PCM has detected a malfunction related to the cruise control system speed set signal.

What does the fault code mean P0568?

Trouble code P0568 indicates that the engine control module (ECM) or body control module (BCM) has detected a problem with the cruise control system speed signal. This means that the cruise control system cannot set or maintain the set speed properly due to a problem with the speed switch.

Fault code P0568.

Possible reasons

Some possible reasons for the P0568 trouble code:

  • Cruise control switch malfunction: The cruise control switch may be damaged or have a mechanical failure that prevents it from detecting or transmitting the speed setting signal correctly.
  • Problems with wiring or electrical connections: A short, open, or poor contact in the electrical circuit between the cruise control switch and the ECM/BCM can cause P0568.
  • ECM/BCM malfunction: The Engine Control Module (ECM) or Body Electronics Control Module (BCM) may be damaged or have programming errors, causing the signals from the cruise control switch to be misinterpreted.
  • Problems with other components of the cruise control system: Faults in other components, such as speed sensors or throttle actuator, can also cause P0568.
  • Incorrect speed setting: The set speed may not meet the requirements of the cruise control system due to problems with the switch or its environment.
  • ECM/BCM Software: Software errors or software version incompatibility in the ECM/BCM may cause an error when processing signals from the cruise control switch.

To accurately determine the cause of the P0568 code, diagnostics are required, including testing electrical circuits, cruise control components, and vehicle control modules.

What are the symptoms of a fault code? P0568?

Symptoms for DTC P0568 may include the following:

  • Cruise control not working: The main symptom will be a non-functioning or inaccessible cruise control function. The driver will not be able to set or maintain a set speed using cruise control.
  • Inactive cruise control button: The cruise control button on the steering wheel may be inactive or unresponsive.
  • No indication on the dashboard: The cruise control indicator on the instrument panel may not light up when you try to activate the cruise control.
  • Dashboard error: An error message such as “Check Engine” or specific indications related to the cruise control system may appear on the instrument panel.
  • Uneven speed: When using cruise control, the vehicle speed may change unevenly or erratically.
  • Losing control of speed: The driver may find that the vehicle does not maintain the set speed when using cruise control.

These symptoms may occur to varying degrees depending on the specific cause of the P0568 code and the characteristics of the vehicle. If you notice these symptoms, it is recommended that you contact a professional auto mechanic to diagnose and fix the problem.

How to diagnose a fault code P0568?

The following steps are recommended to diagnose DTC P0568:

  1. Checking Error Codes: Use a diagnostic scanner to read error codes in the engine management system and other electronic systems in the vehicle. Verify that the P0568 code is indeed present.
  2. Checking electrical connections: Inspect the wiring and connectors connecting the cruise control switch to the ECM or BCM. Check for corrosion, breaks or poor connections. Make sure the connections are tight and secure.
  3. Checking the cruise control switch: Check the operation of the cruise control switch for mechanical damage or malfunction. Make sure the switch functions correctly and transmits signals without problems.
  4. ECM/BCM Diagnostics: Use a diagnostic tool to check the condition of the Engine Control Module (ECM) or Body Control Module (BCM). Make sure they function correctly and have no software errors.
  5. Checking other cruise control system components: Check other components of the cruise control system, such as speed sensors or throttle actuator. Make sure they are working properly and are not causing problems with the speed setting.
  6. Voltage and resistance testing: Perform voltage and resistance tests on relevant electrical circuits to ensure they are operating correctly and meeting manufacturer specifications.
  7. Updating the software: If necessary, update the ECM/BCM software to the latest version to eliminate possible software errors.

After diagnostics, perform the necessary repair actions depending on the problems found.

Diagnostic errors

When diagnosing DTC P0568, the following errors may occur:

  • Incorrect interpretation of error code: Untrained technicians may misinterpret the P0568 code and draw incorrect conclusions about its causes.
  • Incomplete diagnostics of electrical circuits: Incompletely inspected wiring or electrical connections may result in missing important defects that could be causing the P0568 code.
  • Failure to identify mechanical problems: Failure to properly inspect the cruise control switch or its surroundings for mechanical damage may result in a misdiagnosis.
  • Skipping testing of other components: Not only should you check the cruise control switch, but also other components of the cruise control system, such as speed sensors or the throttle actuator. Skipping them may result in missing defects that could be causing the P0568 code.
  • Wrong decision to replace components: Failure to correctly identify the source of the problem may result in unnecessary replacement of components, which may not solve the problem or may result in additional costs.
  • Skipping a software update: Failure to consider updating the ECM/BCM software may result in a missed opportunity to correct the problem with a software update.

To avoid these errors, it is important to carry out a thorough and systematic diagnosis, taking into account all aspects of the cruise control system and electrical circuits. In case of doubt or uncertainty, it is better to contact a professional auto mechanic.

How serious is the fault code? P0568?

Trouble code P0568, associated with errors in the cruise control system speed signal, can have varying degrees of severity depending on the specific circumstances:

  • No major security issues: In most cases, the P0568 code does not pose a serious threat to the safety of the driver or passengers. However, this may cause inconvenience and limit the functionality of the cruise control.
  • Possible inconveniences when driving: Failure of cruise control can lead to additional inconvenience when driving on long trips, especially long distances.
  • Potential Economic Loss: In some cases, repairing or replacing the cruise control system components that cause the P0568 code can be costly, resulting in economic loss for the vehicle owner.
  • Damage to other systems: Although the P0568 code itself is not critical, it can be associated with other faults that affect the normal functioning of the vehicle. For example, damage to electrical circuits or the cruise control switch can cause problems in other systems.

Overall, although the P0568 trouble code is not extremely serious, it should be carefully considered and resolved as soon as possible to avoid further inconvenience and potential driving problems.

What repair will help eliminate the code? P0568?

Resolving the P0568 trouble code will depend on the specific cause of its occurrence, some possible steps to resolve this issue are:

  1. Cruise control switch replacement: If the problem is due to damage or malfunction of the cruise control switch, it can be replaced with a new, working component.
  2. Repair or replacement of electrical connections: Check the wiring and connectors connecting the cruise control switch to the engine control module or body electronic systems. If problems are found, repair or replace electrical connections.
  3. Diagnostics and replacement of the control module: If the problem is due to a faulty Engine Control Module (ECM) or Body Control Module (BCM), they may require diagnosis and possibly replacement.
  4. Updating the software: If the problem is due to software bugs in the ECM or BCM, updating the software to the latest version may help resolve the problem.
  5. Additional diagnostic measures: Sometimes the cause of the P0568 code may not be obvious. Additional diagnostic activities may be required to identify hidden problems such as short circuits or open circuits.

It is recommended that you have your P0568 code diagnosed and repaired by a qualified auto mechanic or service center. This will help avoid additional problems and ensure the problem is resolved correctly.

How to Diagnose and Fix P0568 Engine Code - OBD II Trouble Code Explain

P0568 – Brand-specific information

Trouble code P0568 can apply to various makes and models of cars, a list of some of them with their meanings:

Please note that information may vary depending on the specific model and year of your vehicle. It is always best to check the error code description against your specific vehicle's documentation and specifications.

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