AutoCodes – Mazda – P0594 Mazda

P0594 Mazda Code - Speed Control Servo Control Circuit Open

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: P0594 Mazda indicates Speed Control Servo Control Circuit Open.
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 3,235

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
FAQs
Comments
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Code P0594 Mazda 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 P0594 Mazda - Speed Control Servo Control Circuit Open - AutoCodes.com — P0594 Mazda Code - Speed Control Servo Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0594 Mazda?

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

How to Fix the DTC P0594 Mazda?

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 P0594 Mazda 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 P0594 Mazda code?

Need more information on how to fix the P0594 Mazda code? Get Access to Factory Service Manuals

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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 P0594 Mazda Code

1. What are the common symptoms of OBDII code P0594 in a Mazda?

The common symptoms of OBDII code P0594 in a Mazda include issues with the speed control system, such as the cruise control not working properly, the vehicle surging or hesitating during acceleration, and an illuminated check engine light.

2. What causes the OBDII code P0594 in a Mazda?

The OBDII code P0594 in a Mazda is typically caused by a malfunction in the speed control servo control circuit, which may be due to a faulty speed control servo, damaged wiring or connectors, or a failed speed control switch.

3. How can I diagnose the OBDII code P0594 in my Mazda?

To diagnose the OBDII code P0594 in your Mazda, you can use an OBDII scanner to retrieve the fault code and then inspect the speed control servo, wiring, and connectors for any visible damage or issues. Testing the speed control switch and related components may also be necessary.

4. Can I still drive my Mazda with the OBDII code P0594 present?

It is generally safe to drive your Mazda with the OBDII code P0594, but you may experience issues with the speed control system. It is recommended to address the underlying problem as soon as possible to prevent further damage or inconvenience.

5. How can I repair the OBDII code P0594 in my Mazda?

To repair the OBDII code P0594 in your Mazda, you may need to replace the speed control servo if it is faulty, repair damaged wiring or connectors, or replace the speed control switch if necessary. Clearing the fault code with an OBDII scanner after the repair is complete is also recommended.

6. Is it possible to reset the OBDII code P0594 in a Mazda without repairing the issue?

While resetting the OBDII code P0594 in a Mazda without addressing the underlying problem may temporarily turn off the check engine light, the issue will likely persist and the code may return. It is best to diagnose and repair the root cause of the code.

7. How much does it cost to repair the OBDII code P0594 in a Mazda?

The cost to repair the OBDII code P0594 in a Mazda can vary depending on the specific cause of the issue, the parts needed for repair, and labor costs. It is recommended to consult a mechanic or dealership for an accurate estimate.

8. Will the OBDII code P0594 affect my Mazda's performance?

The OBDII code P0594 may affect your Mazda's performance by causing issues with the speed control system. You may experience problems with maintaining speed or using cruise control, which can impact your driving experience.

9. How common is the OBDII code P0594 in Mazdas?

The OBDII code P0594 related to the speed control servo control circuit open is not as common as some other OBDII codes, but it can still occur in Mazdas, particularly in vehicles with older or worn components in the speed control system.

10. Can I prevent the OBDII code P0594 from appearing in my Mazda?

To prevent the OBDII code P0594 from appearing in your Mazda, it is important to perform regular maintenance on the speed control system, including checking for any signs of wear or damage, and addressing any issues promptly to avoid potential malfunctions.