AutoCodes – Mercedes-Benz – P0577 Mercedes-Benz

P0577 Mercedes-Benz Code - Cruise Control Input Circuit 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: P0577 Mercedes-Benz indicates Cruise Control Input Circuit 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.

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Code Popularity 3,227

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 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 P0577 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 P0577 Mercedes-Benz - Cruise Control Input Circuit High - AutoCodes.com — P0577 Mercedes-Benz Code - Cruise Control Input Circuit High

What does this mean?

What are the Possible Causes of the DTC P0577 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 P0577 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 P0577 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 P0577 Mercedes-Benz code?

Need more information on how to fix the P0577 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0577 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 P0577 Mercedes-Benz Code

1. What does OBDII code P0577 mean on a Mercedes-Benz?

P0577 indicates a "Cruise Control Input Circuit High" issue, meaning the cruise control system has detected an electrical fault with a high voltage signal in the input circuit.

2. What are the symptoms of code P0577 in a Mercedes-Benz?

Common symptoms include the cruise control system not engaging or functioning properly, a check engine light, and potentially erratic throttle behavior.

3. What causes the P0577 code to appear in a Mercedes-Benz?

The code is typically caused by a faulty cruise control switch, damaged wiring, a stuck relay, or a malfunction in the cruise control module.

4. Can I still drive my Mercedes-Benz with a P0577 code?

Yes, you can still drive, but the cruise control system may not work. However, it's best to address the issue promptly to avoid potential electrical problems.

5. How do I diagnose the P0577 code in a Mercedes-Benz?

Diagnose the issue by using an OBDII scanner to confirm the code, inspecting the cruise control switch and related wiring for damage, and testing the voltage in the circuit.

6. What is the most common fix for the P0577 code on a Mercedes-Benz?

The most common fix is replacing a faulty cruise control switch or repairing damaged wiring in the cruise control circuit.

7. Can a blown fuse trigger the P0577 code in a Mercedes-Benz?

Yes, a blown fuse related to the cruise control system can cause the circuit to malfunction and trigger the P0577 code.

8. How much does it cost to fix the P0577 code on a Mercedes-Benz?

Repair costs can range from $50 to $300, depending on whether the issue is a simple wiring repair or replacement of the cruise control switch.

9. Can a faulty brake light switch cause the P0577 code in a Mercedes-Benz?

Yes, a malfunctioning brake light switch can interfere with the cruise control system and potentially trigger the P0577 code.

10. Is it safe to clear the P0577 code without fixing the issue?

Clearing the code without fixing the underlying problem may temporarily turn off the warning light, but the issue will likely return and could lead to further complications.