P0595 Cruise Control Actuator Control Circuit Low

P0595 – OBD-II Trouble Code Technical Description

Trouble code P0595 indicates that the cruise control actuator control circuit is low.

What does the fault code mean P0595?

Trouble code P0595 indicates a problem with the cruise control servo, which helps the vehicle automatically maintain speed. If the engine control module (ECM) detects a malfunction, the entire cruise control system is tested. Code P0595 occurs when the ECM detects that the voltage or resistance in the cruise control servo control circuit is too low.

Possible reasons

Some possible causes of the P0595 trouble code:

• Damaged cruise control servo: Damage to the servo itself, such as corrosion, broken wires, or mechanical damage, can cause this code to appear.
• Problems with electrical connections: Loose or damaged electrical connections between the servo and the Engine Control Module (ECM) can cause insufficient voltage or resistance in the circuit, causing a code to appear.
• ECM malfunction: Problems with the ECM itself, such as corrosion on the contacts or internal damage, can cause the cruise control servo to misread signals.
• Faulty speed sensor: If the speed sensor is not working correctly, it can cause problems with the cruise control, which in turn can cause the P0595 code to appear.
• Problems with wiring or connectors: Breaks, corrosion, or damage in the wiring or connectors between the ECM and servo may cause an unstable electrical connection and cause this code to appear.
• Problems with the power system: Low voltage or battery problems can also cause a P0595 code as it may result in insufficient power to operate the servo.

What are the symptoms of a fault code? P0595?

Symptoms for DTC P0595 may include the following:

• Cruise control not working: One of the most obvious symptoms is the inability to use cruise control. If the cruise control servo is not functioning due to P0595, the driver will not be able to set or maintain the set speed.
• Smooth speed changes: If the cruise control servo is unstable or malfunctioning due to P0595, it may cause smooth or sudden changes in vehicle speed while using cruise control.
• Illuminates the «Check Engine» indicator: When P0595 occurs, the Check Engine light on the instrument panel will turn on.
• Poor fuel economy: Unstable cruise control due to P0595 may affect fuel economy as the vehicle may not be able to effectively maintain a constant speed.
• Other errors in the engine management system: Code P0595 may be accompanied by other errors in the engine management or cruise control system, depending on the vehicle specifications and related problems.

How to diagnose a fault code P0595?

The following steps are recommended to diagnose DTC P0595:

1. Checking Error Codes: Use a diagnostic scanner to read error codes from the engine management system. Check to see if there are other related errors besides the P0595 code that may indicate additional problems.
2. Checking electrical connections: Inspect the wires and connectors connecting the cruise control servo to the engine control module (ECM). Check them for corrosion, damage or corrosion. Make sure all connections are tight and secure.
3. Voltage and resistance measurement: Use a multimeter to measure the voltage and resistance in the cruise control servo control circuit. Compare the values ​​obtained with the vehicle manufacturer's recommended values.
4. Checking the cruise control servo: Check the cruise control servo itself for visible damage, corrosion, or broken wires. Make sure it moves freely and functions correctly.
5. Check ECM: Since the P0595 code indicates a low voltage or resistance problem in the control circuit, check the Engine Control Module (ECM) itself for damage or defects. Replace the ECM if necessary.
6. Repeated diagnostics and test drive: After completing all checks and replacing components if necessary, reconnect the scan tool to ensure that DTC P0595 no longer appears. Take it for a test drive to check the operation of the cruise control and ensure that the problem has been successfully resolved.

Diagnostic errors

When diagnosing DTC P0595, the following errors may occur:

• Incorrect interpretation of code: The error may occur if the diagnostic scanner incorrectly interprets the P0595 code or other related error codes. This may lead to incorrect identification of the cause of the malfunction and incorrect repair.
• Insufficient diagnosis: Some mechanics may only focus on replacing components without doing sufficient diagnostics. This may result in replacing unnecessary parts and may not solve the problem.
• Skip checking electrical connections: Incorrect operation may occur if the electrical connections between the ECM and the cruise control servo have not been checked. Poor connections can be the source of the problem.
• Skipping check for other possible causes: Sometimes other possible causes of the P0595 code may be missed, such as damaged wires, speed sensor faults, or problems with the ECM itself. This may result in the need for additional repair work after replacing components.
• Failure to fix the problem: Sometimes the problem can be complex and ambiguous, and despite all the necessary checks being carried out, the cause of the problem may remain unknown or unresolved without specialized equipment or experience.

How serious is the fault code? P0595?

Trouble code P0595, indicating a problem with the cruise control servo, can be serious for driving safety and comfort, especially if the driver regularly uses cruise control. Failure to maintain a constant speed can result in discomfort when driving long distances or in areas with variable topography.

However, if the driver does not rely on cruise control or uses it rarely, then the problem may be less severe. However, it is recommended to resolve the issue as soon as possible to avoid additional inconvenience and possible consequences.

Additionally, the P0595 code may be related to other problems in the vehicle's engine management system or electrical system, which can also affect the vehicle's overall performance and reliability.

What repair will help eliminate the code? P0595?

Troubleshooting trouble code P0595 may include the following steps:

1. Cruise control servo replacement: If the problem is due to damage or malfunction of the cruise control servo, then replacement may be necessary. This may require removal and replacement of the servo according to the manufacturer's procedures.
2. Repair of electrical connections: If the problem is caused by loose or damaged electrical connections between the ECM and the cruise control servo, these connections will need to be repaired or replaced.
3. ECM Check and Service: Sometimes the problem may be due to a problem with the engine control module (ECM) itself. In this case, you may need to check it, update the software, or replace it.
4. Checking other components: Some other components such as the speed sensor or other sensors may also be causing the problem. Perform additional diagnostics to rule out possible problems with these components.
5. Programming and updating: After component replacement or repair work, programming or software updates may be required for the ECM to properly recognize and control the cruise control servo.

It is recommended that you contact a professional auto mechanic or service center to diagnose and repair the P0595 problem.

What is P0595 Engine Code [Quick Guide]

P0595 – Brand-specific information

Trouble code P0595 relates to the vehicle's cruise control system. This code indicates a problem with the cruise control servo, decoding for some specific car brands:

1. Volkswagen (VW): Cruise control actuator control circuit signal low.
2. Ford: The cruise control servo circuit is low.
3. Chevrolet (Chevy): Cruise control servo - low signal.
4. Toyota: Cruise control servo circuit signal level.
5. BMW: Cruise control actuator control circuit signal low.
6. Mercedes-Benz: Cruise control actuator control circuit signal low.
7. Audi: Cruise control servo circuit signal level.
8. Honda: Cruise control servo circuit signal level.
9. Nissan: Cruise control servo circuit - low signal.
10. Hyundai: Cruise control servo - low signal.

Keep in mind that these breakdowns may vary slightly depending on the model and year of your vehicle, so it's always best to check the specific technical data for your vehicle.