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P0604 Mercedes-Benz Code - Internal Control Module Random Access Memory Error

Quick Answer

The P0604 code for Mercedes-Benz indicates an Internal Control Module Random Access Memory (RAM) Error. Common causes include Electrical issues such as a faulty wiring harness or loose connections, Corrosion or moisture in the control module connectors, Software glitches or programming errors in the control module. 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
P0604 Mercedes-Benz indicates Internal Control Module Random Access Memory Error.
Common causes
Common causes include Electrical issues such as a faulty wiring harness or loose connections, Corrosion or moisture in the control module connectors, Software glitches or programming errors in the control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0604 Mercedes-Benz Description

The P0604 code for Mercedes-Benz indicates an Internal Control Module Random Access Memory (RAM) Error. This error occurs when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a malfunction in the random access memory of the vehicle's internal control module. The RAM is a crucial component of the control module that stores temporary data and information necessary for the vehicle's operation.

OBDII Code P0604 Mercedes-Benz - Internal Control Module Random Access Memory Error
P0604 Mercedes-Benz Code - Internal Control Module Random Access Memory Error

Common Causes of P0604 Mercedes-Benz

  1. Electrical issues such as a faulty wiring harness or loose connections
  2. Corrosion or moisture in the control module connectors
  3. Software glitches or programming errors in the control module
  4. Internal hardware malfunctions within the control module
  5. Power surges or voltage spikes damaging the RAM

Symptoms of P0604 Mercedes-Benz

  1. Check Engine Light illuminated on the dashboard
  2. Decreased engine performance or power
  3. Rough idling or engine stalling
  4. Poor fuel efficiency
  5. Difficulty starting the vehicle

How to Fix P0604 Mercedes-Benz

  1. Use a diagnostic scanner to retrieve the error code and freeze frame data for further analysis.
  2. Inspect the control module connectors for any signs of corrosion or damage, and clean or repair as needed.
  3. Perform a thorough check of the vehicle's electrical system to ensure proper voltage supply and grounding.
  4. Update the control module software to the latest version or reprogram it to address any software glitches.
  5. If necessary, replace the control module with a new or remanufactured unit to resolve the RAM error.

Cost to Fix P0604 Mercedes-Benz

The typical repair costs for addressing a P0604 Internal Control Module RAM Error in a Mercedes-Benz can range from $300 to $800, including parts and labor. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher at dealerships or metropolitan areas and lower at independent shops. It is recommended to obtain local quotes for a more accurate estimate of the repair costs.

What does this mean?

Tech Notes for P0604 Mercedes-Benz

Check the ECM/PCM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the ECM/PCM.

When is the Code Detected?

Indicates the ECM has experienced an internal memory fault.

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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 P0604 Mercedes-Benz Code

1. What does the OBDII code P0604 mean on a Mercedes-Benz?

P0604 indicates an "Internal Control Module Random Access Memory (RAM) Error," meaning the Engine Control Module (ECM) has detected an issue with its internal memory.

2. What are the common symptoms of a P0604 code in a Mercedes-Benz?

Symptoms may include difficulty starting the engine, poor performance, stalling, erratic shifting (in automatic transmissions), or the Check Engine Light being illuminated.

3. What causes the P0604 code in a Mercedes-Benz?

Common causes include a corrupted ECM, voltage spikes, water damage to the ECM, software glitches, or a failing ECM.

4. Can a weak battery cause the P0604 code in a Mercedes-Benz?

Yes, a weak or failing battery, or poor electrical connections, can cause voltage irregularities that may trigger this code.

5. How do you diagnose a P0604 code on a Mercedes-Benz?

Diagnosis typically involves checking the battery and charging system, inspecting ECM connections for corrosion or damage, and using specialized diagnostic tools to test the ECM.

6. Can the P0604 code be cleared without repairs?

Clearing the code without addressing the root cause may temporarily turn off the Check Engine Light, but the issue is likely to recur until repairs are performed.

7. Is an ECM replacement always necessary for a P0604 code?

Not always. The issue could be caused by wiring problems, battery issues, or software glitches. ECM replacement should only be done after thorough diagnosis.

8. How can I prevent the P0604 code from occurring in my Mercedes-Benz?

Regularly maintain the battery and charging system, keep electrical connections clean and secure, and avoid jump-starting the vehicle improperly.

9. Can driving with a P0604 code damage my Mercedes-Benz?

While it may not cause immediate damage, continued driving with an unresolved P0604 code could lead to performance issues, stalling, and potential safety risks.

10. How much does it cost to repair a P0604 code on a Mercedes-Benz?

Repair costs can vary widely. Battery or wiring fixes may cost $100–$300, while ECM replacement can range from $800–$2,000, depending on the model and labor rates.

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