AutoCodes – Volvo – P0604 Volvo

P0604 Volvo Code - Internal Control Module Random Access Memory Error

Quick Answer

This Diagnostic Trouble Code (DTC) is stored in the Engine Control Module (ECM) when a processing malfunction is detected. Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM). 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 Volvo indicates Internal Control Module Random Access Memory Error.
Common causes: Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM).
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 1,137

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 Mar 17, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0604 Volvo Description

This Diagnostic Trouble Code (DTC) is stored in the Engine Control Module (ECM) when a processing malfunction is detected. All power supplies and grounds should be tested before condemning a control module. Signals processed by the control module must be in digital form so analog signals must be converted for analysis. Before replacing the control module an investigation must take place to ensure the module is operating on the latest software. This fault code should only be addressed after any other component-related codes have been investigated.

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

What does this mean?

What are the Possible Causes of the DTC P0604 Volvo?

Loose or poor battery terminal connection
Low battery charge
Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P0604 Volvo?

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 Engine Control Module (ECM)fuse, if the fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replace the ECM/PCM.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0604 Volvo 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.

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Need Help with the Code?

Get the P0604 Volvo 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 P0604 Volvo Code

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

- Common symptoms of code P0604 include the check engine light coming on, engine performance issues, and potential stalling or rough idling.

2. What causes the Internal Control Module Random Access Memory Error in a Volvo?

- The P0604 code in a Volvo is usually caused by a failure within the Engine Control Module (ECM) or a software issue related to the ECM's random access memory.

3. How serious is the P0604 OBDII code in a Volvo?

- While the P0604 code may not cause immediate drivability issues, it is important to address it promptly as it can lead to further ECM malfunctions and potential long-term damage.

4. Can a DIYer repair the P0604 code in a Volvo?

- Repairing the P0604 code in a Volvo often requires advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic or authorized Volvo service center for proper diagnosis and repair.

5. How is the Internal Control Module Random Access Memory Error diagnosed in a Volvo?

- Diagnosing the P0604 code typically involves using an OBDII scanner to retrieve the code, followed by thorough inspection of the ECM's connections, wiring, and software integrity.

6. Are there any quick fixes for the P0604 code in a Volvo?

- Quick fixes for the P0604 code are rare, as it usually indicates a more serious issue within the ECM. Resetting the code may temporarily clear the check engine light, but the underlying problem will persist.

7. How much does it cost to repair the P0604 OBDII code in a Volvo?

- Repair costs for the P0604 code in a Volvo can vary depending on the extent of the damage and whether the ECM needs to be replaced. It is advisable to get a professional estimate for an accurate cost.

8. Can driving with the P0604 code cause further damage to the vehicle?

- Continuing to drive with the P0604 code present can potentially cause further damage to the ECM and other engine components. It is best to address the issue promptly to prevent costly repairs down the line.

9. Is the P0604 code covered under Volvo's warranty?

- Whether the P0604 code is covered under warranty depends on the age and mileage of the vehicle. It is recommended to check with your Volvo dealership or refer to your warranty documentation for specific coverage details.

10. How long does it take to repair the P0604 code in a Volvo?

- The repair time for the P0604 code can vary depending on the exact cause of the issue and the availability of replacement parts. In some cases, repairs can be completed within a few hours, while more complex issues may take longer.