AutoCodes – Mercedes-Benz – P0574 Mercedes-Benz

P0574 Mercedes-Benz Code - Cruise Control System Vehicle Speed Too High

Quick Answer

The Engine Control Module (ECM) monitors the Cruise Control System. Common causes include Faulty Cruise Control Function Switch, Cruise Control Function Switch harness is open or shorted, Cruise Control Function Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0574 Mercedes-Benz indicates Cruise Control System Vehicle Speed Too High.
Common causes: Common causes include Faulty Cruise Control Function Switch, Cruise Control Function Switch harness is open or shorted, Cruise Control Function Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,600

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0574 Mercedes-Benz Description

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

OBDII Code P0574 Mercedes-Benz - Cruise Control System Vehicle Speed Too High - AutoCodes.com — P0574 Mercedes-Benz Code - Cruise Control System Vehicle Speed Too High

What does this mean?

What are the Possible Causes of the DTC P0574 Mercedes-Benz?

Faulty Cruise Control Function Switch
Cruise Control Function Switch harness is open or shorted
Cruise Control Function Switch circuit poor electrical connection

How to Fix the DTC P0574 Mercedes-Benz?

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 P0574 Mercedes-Benz 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 P0574 Mercedes-Benz code?

Need more information on how to fix the P0574 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0574 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0574 Mercedes-Benz Code

1. What does the OBDII code P0574 mean on a Mercedes-Benz?

P0574 indicates that the cruise control system has detected a vehicle speed that is too high or inconsistent with expected parameters.

2. What are the common symptoms of code P0574 in a Mercedes-Benz?

Common symptoms include the cruise control not engaging, disengaging unexpectedly, or the cruise control warning light activating.

3. What causes the P0574 code to appear in a Mercedes-Benz?

Typical causes include a faulty cruise control switch, a damaged brake light switch, a malfunctioning speed sensor, or wiring issues in the cruise control system.

4. Can a faulty brake light switch trigger the P0574 code?

Yes, a defective brake light switch can send incorrect signals to the cruise control system, leading to the P0574 code.

5. How can I diagnose the P0574 code in my Mercedes-Benz?

Start by checking the brake light switch, cruise control buttons, speed sensor readings, and inspect the wiring for damage or loose connections.

6. Can driving with the P0574 code cause further damage to my vehicle?

While it may not directly cause significant damage, ignoring the issue could lead to unsafe driving conditions due to malfunctioning cruise control.

7. How do I fix the P0574 code on my Mercedes-Benz?

Repairs may involve replacing a faulty brake light switch, fixing damaged wiring, replacing a defective speed sensor, or repairing the cruise control module.

8. Is it safe to drive a Mercedes-Benz with the P0574 code?

It is generally safe to drive, but the cruise control system may not function properly, so extra caution is advised.

9. How much does it cost to fix the P0574 code in a Mercedes-Benz?

Repair costs vary depending on the issue but can range from $50 to $300 for parts and labor, depending on whether it's a switch, sensor, or wiring problem.

10. Can I reset the P0574 code without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it will likely return unless the root cause of the problem is resolved.