AutoCodes – Volkswagen – P0604 Volkswagen

P0604 Volkswagen Code - Internal Control Module Random Access Memory Error

Quick Answer

The ECM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. Common causes include Loose or poor battery terminal connection, Low battery charge, ECM power supply 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: P0604 Volkswagen indicates Internal Control Module Random Access Memory Error.
Common causes: Common causes include Loose or poor battery terminal connection, Low battery charge, ECM power supply 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 7,880

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0604 Volkswagen Description

The 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 will set the code and illuminate the engine light.

OBDII Code P0604 Volkswagen - Internal Control Module Random Access Memory Error - AutoCodes.com — P0604 Volkswagen Code - Internal Control Module Random Access Memory Error

What does this mean?

What are the Possible Causes of the DTC P0604 Volkswagen?

Loose or poor battery terminal connection
Low battery charge
ECM power supply circuit is open or shorted
ECM Programing
Faulty ECM

How to Fix the DTC P0604 Volkswagen?

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 does this mean?

Code Tech Notes

Check the ECM 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0604 Volkswagen 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 P0604 Volkswagen code?

Need more information on how to fix the P0604 Volkswagen code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 Volkswagen Code

1. What are common symptoms of OBDII code P0604 in a Volkswagen?

- Common symptoms include the check engine light being illuminated on the dashboard, rough idling, and potential difficulty starting the vehicle.

2. What does the OBDII code P0604 for a Volkswagen indicate?

- The code P0604 indicates an Internal Control Module Random Access Memory Error within the vehicle's engine control module (ECM).

3. What are the possible causes of the P0604 code in a Volkswagen?

- Possible causes of the P0604 code include a faulty ECM, damaged wiring or connectors, low battery voltage, or a software issue within the ECM.

4. How can I diagnose the P0604 code in my Volkswagen?

- Diagnosing the P0604 code typically involves using a diagnostic scanner to read the code, checking for any other related codes, inspecting the wiring and connectors, and testing the battery voltage.

5. Can I continue driving my Volkswagen with the P0604 code present?

- It is not recommended to continue driving your Volkswagen with the P0604 code present, as it can potentially cause further damage to the vehicle and affect its performance.

6. How can I repair the P0604 code in my Volkswagen?

- Repairing the P0604 code may involve clearing the code and resetting the ECM, repairing or replacing damaged wiring or connectors, ensuring the battery voltage is correct, or updating the ECM software.

7. Will the P0604 code cause my Volkswagen to fail an emissions test?

- Yes, the presence of the P0604 code in your Volkswagen may cause it to fail an emissions test, as it indicates a fault in the vehicle's engine control module.

8. How much does it typically cost to fix the P0604 code in a Volkswagen?

- The cost to fix the P0604 code in a Volkswagen can vary depending on the exact cause of the issue, but it may range from around $100 for a simple reset to several hundred dollars for more extensive repairs.

9. Can I clear the P0604 code in my Volkswagen using an OBDII scanner?

- Yes, you can attempt to clear the P0604 code in your Volkswagen using an OBDII scanner, but it is important to address the underlying cause of the code to prevent it from reoccurring.

10. Is it possible to prevent the P0604 code from appearing in my Volkswagen?

- While some causes of the P0604 code may be unavoidable, maintaining your vehicle's battery health, performing regular maintenance, and addressing any issues promptly can help reduce the likelihood of the code appearing.