AutoCodes – Mercedes-Benz – P0605 Mercedes-Benz

P0605 Mercedes-Benz Code - Control Module Fault

Quick Answer

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground circuit is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0605 Mercedes-Benz indicates Control Module Fault.
Common causes: Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground circuit is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 17,992

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0605 Mercedes-Benz Description

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the ECM sets the P0605 code and illuminates the MIL.

OBDII Code P0605 Mercedes-Benz - Control Module Fault - AutoCodes.com — P0605 Mercedes-Benz Code - Control Module Fault

What does this mean?

What are the Possible Causes of the DTC P0605 Mercedes-Benz?

Engine Control Module (ECM) may be faulty
ECM harness power supply circuit is open or shorted
ECM harness ground circuit is open or shorted

How to Fix the DTC P0605 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 P0605 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 P0605 Mercedes-Benz code?

Need more information on how to fix the P0605 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0605 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 P0605 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0605 in a Mercedes-Benz related to a control module fault?

- Common symptoms include engine stalling, rough idling, loss of power, and issues with starting the vehicle.

2. What are the possible causes of the P0605 code indicating a control module fault in a Mercedes-Benz?

- The P0605 code can be triggered by a faulty ECM (Engine Control Module), damaged wiring, or a software issue within the control module.

3. How can I diagnose the P0605 code in my Mercedes-Benz if I suspect a control module fault?

- Diagnosis often involves using a professional OBDII scanner to read the code and assess the ECM's functionality, as well as checking for any visible wiring damage.

4. Is it safe to continue driving my Mercedes-Benz with the P0605 code indicating a control module fault?

- It is not recommended to drive the vehicle with the P0605 code present, as it can lead to further damage and potential safety risks.

5. What are the typical repair options for resolving the P0605 code related to a control module fault in a Mercedes-Benz?

- Repair options may include replacing the ECM, repairing damaged wiring, or updating the control module software.

6. Can a DIY enthusiast fix the P0605 code indicating a control module fault in a Mercedes-Benz?

- While some basic diagnosis and repairs can be done by DIY enthusiasts, resolving the P0605 code often requires specialized tools and expertise, so professional help is recommended.

7. How can I prevent the recurrence of the P0605 code indicating a control module fault in my Mercedes-Benz?

- Regular maintenance, avoiding rough driving conditions, and ensuring proper care of the vehicle's electrical systems can help prevent the reoccurrence of the P0605 code.

8. Will resetting the OBDII system clear the P0605 code related to a control module fault in my Mercedes-Benz?

- Resetting the system may temporarily clear the code, but it will likely reappear if the underlying issue with the control module is not addressed.

9. How long does it typically take to repair the P0605 code indicating a control module fault in a Mercedes-Benz?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem.

10. Does the P0605 code indicating a control module fault in a Mercedes-Benz affect emissions or vehicle performance?

- Yes, the P0605 code can impact emissions and vehicle performance, as it indicates a problem with the control module that can affect engine operation and fuel efficiency.