P0596 Code - Speed Control Servo Control Circuit High
Quick Answer
The P0596 diagnostic trouble code (DTC) refers to a Speed Control Servo Control Circuit High. Common causes include Faulty speed control servo: A defective speed control servo can cause the circuit to operate at a higher voltage than normal, Damaged wiring: Corroded or damaged wiring in the speed control servo control circuit can lead to a high voltage condition, ECM malfunction: A malfunctioning Engine Control Module (ECM) can send incorrect signals to the speed control servo, causing voltage irregularities. 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
- P0596 indicates Speed Control Servo Control Circuit High.
- Common causes
- Common causes include Faulty speed control servo: A defective speed control servo can cause the circuit to operate at a higher voltage than normal, Damaged wiring: Corroded or damaged wiring in the speed control servo control circuit can lead to a high voltage condition, ECM malfunction: A malfunctioning Engine Control Module (ECM) can send incorrect signals to the speed control servo, causing voltage irregularities.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0596 Description
The P0596 diagnostic trouble code (DTC) refers to a Speed Control Servo Control Circuit High. This code indicates that there is a high voltage condition in the speed control servo control circuit. The speed control servo is responsible for maintaining a constant speed of the vehicle, often referred to as cruise control. When this circuit is compromised, it can lead to issues with the vehicle's speed control system.
Common Causes of P0596
- Faulty speed control servo: A defective speed control servo can cause the circuit to operate at a higher voltage than normal.
- Damaged wiring: Corroded or damaged wiring in the speed control servo control circuit can lead to a high voltage condition.
- ECM malfunction: A malfunctioning Engine Control Module (ECM) can send incorrect signals to the speed control servo, causing voltage irregularities.
- Short circuit: A short circuit in the speed control servo control circuit can result in a high voltage condition.
Symptoms of P0596
- Inoperative cruise control: One of the most common symptoms associated with the P0596 code is the inability to engage or maintain cruise control.
- Speed fluctuations: The vehicle may experience sudden changes in speed while the cruise control is engaged.
- Check Engine Light: The illumination of the Check Engine Light on the dashboard is a common indicator of this code being present.
- Reduced fuel efficiency: A malfunctioning speed control servo control circuit can lead to decreased fuel efficiency due to inconsistent speed control.
How to Fix P0596
- Diagnose the issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the exact cause of the high voltage condition in the speed control servo control circuit.
- Inspect wiring: Thoroughly inspect the wiring harness connected to the speed control servo for any signs of damage or corrosion. Repair or replace any damaged wiring.
- Test speed control servo: Test the speed control servo to determine if it is functioning properly. Replace the servo if it is found to be faulty.
- Check ECM: Inspect the Engine Control Module (ECM) for any signs of malfunction. If necessary, reprogram or replace the ECM to address the high voltage condition.
- Clear codes and test: After completing the repairs, clear the trouble codes from the ECM and test the vehicle to ensure that the issue has been resolved.
Cost to Fix P0596
The cost of repairing a P0596 code can vary depending on the specific cause of the issue and the make and model of the vehicle. In general, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for addressing a Speed Control Servo Control Circuit High issue typically falls between $200 and $500. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from local shops for a more accurate estimate.
When is the Code Detected?
Need more information about the P0596 code?
Need more information on how to fix the P0596 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0596 code diagnosed by a professional: Find a repair shop in your area
Code P0596 Information for Specific Makes
- P0596 Mazda — Speed Control Servo Control Circuit High
Frequently Asked Questions about P0596 Code
No Frequently Asked Questions about P0596 Code found.
Discuss the causes and fixes for P0596 OBDII Code
Code P0596 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.