AutoCodes – Generic – P0596

P0596 Code - Speed Control Servo Control Circuit High

Quick Answer

The Engine Control Module (ECM) monitors the Cruise Control Servo. Common causes include Faulty Servo Motor, Servo Motor harness is open or shorted, Servo Motor circuit poor electrical connection. 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 Servo Motor, Servo Motor harness is open or shorted, Servo Motor circuit poor electrical connection.
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.

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Code Popularity 6,500

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0596 Description

The Engine Control Module (ECM) monitors the Cruise Control Servo. The ECM sets the OBDII code when the Cruise Control Servo is not to factory specifications.

OBDII Code P0596 - Speed Control Servo Control Circuit High - AutoCodes.com — P0596 Code - Speed Control Servo Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0596?

Faulty Servo Motor
Servo Motor harness is open or shorted
Servo Motor circuit poor electrical connection

How to Fix the DTC P0596?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0596 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0596 code?

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Need Help with the Code?

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Information for Specific Makes

P0596 Mazda — Speed Control Servo Control Circuit High

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.