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Engine-Codes – Subaru – P0604 Subaru

P0604 Subaru Code - Internal Control Module Random Access Memory Error

Quick Answer

The P0604 Subaru code indicates an Internal Control Module Random Access Memory Error. Common causes include Faulty ECM/PCM, Software glitch in the module, Electrical issues such as a short circuit. 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 Subaru indicates Internal Control Module Random Access Memory Error.
Common causes
Common causes include Faulty ECM/PCM, Software glitch in the module, Electrical issues such as a short circuit.
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 08, 2024
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Code P0604 Subaru Description

The P0604 Subaru code indicates an Internal Control Module Random Access Memory Error. This means that there is an issue with the vehicle's Engine Control Module (ECM) or Powertrain Control Module (PCM) memory. The ECM/PCM is responsible for controlling various functions of the vehicle, such as engine timing, fuel delivery, and emissions control.

OBDII Code P0604 Subaru - Internal Control Module Random Access Memory Error
P0604 Subaru Code - Internal Control Module Random Access Memory Error

Common Causes of P0604 Subaru

  1. Faulty ECM/PCM
  2. Software glitch in the module
  3. Electrical issues such as a short circuit
  4. Poor connection between the module and wiring harness
  5. Environmental factors such as extreme temperatures affecting the memory

Symptoms of P0604 Subaru

  1. Check Engine Light is illuminated
  2. Engine stalling or rough idling
  3. Decreased fuel efficiency
  4. Loss of power or acceleration
  5. Difficulty starting the vehicle

How to Fix P0604 Subaru

  1. Diagnose the issue by using an OBD-II scanner to retrieve the specific error code and identify the source of the problem.
  2. Inspect the ECM/PCM for any visible signs of damage or corrosion.
  3. Check the wiring harness and connections to ensure they are secure and free of any issues.
  4. If necessary, reprogram or replace the ECM/PCM to address the memory error.
  5. Clear the error code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0604 Subaru

The typical repair costs for addressing a P0604 Subaru code can range from $200 to $600, depending on the specific cause of the issue and the extent of the repairs needed. This estimate includes the cost of parts and labor. However, it's important to note that the actual cost can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. Additionally, diagnostic time and labor rates can also impact the final cost. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0604 Subaru

Check the 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 PCM.

When is the Code Detected?

Indicates the PCM 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 Subaru Code

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

The common symptoms of OBDII code P0604 in a Subaru include engine stalling, rough idling, poor acceleration, and difficulties starting the vehicle.

2. What causes the Internal Control Module Random Access Memory Error (P0604) in a Subaru?

The P0604 code in a Subaru is typically caused by a faulty internal control module, a software issue, a corrupted memory, or a wiring problem.

3. How serious is the P0604 code in a Subaru?

The P0604 code is considered a serious issue as it can lead to poor engine performance, potential stalling, and overall drivability problems. It is recommended to address this issue promptly.

4. Can I still drive my Subaru with the P0604 code present?

It is not advisable to continue driving your Subaru with the P0604 code present, as it can result in further damage to the vehicle and compromise safety. It is recommended to have the issue diagnosed and repaired as soon as possible.

5. How is the P0604 code diagnosed in a Subaru?

Diagnosing the P0604 code in a Subaru typically involves using an OBDII scanner to retrieve the code, inspecting the internal control module and related wiring, and performing a thorough system check to identify the root cause of the issue.

6. What are some repair tips for fixing the P0604 code in a Subaru?

Repairing the P0604 code in a Subaru may involve reprogramming the internal control module, replacing the faulty module, addressing any software issues, or repairing damaged wiring. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.

7. Can a DIY enthusiast fix the P0604 code in a Subaru?

While some DIY enthusiasts may have the skills to address the P0604 code in a Subaru, it is recommended to seek professional help due to the complexity of the internal control module and potential software issues involved in the repair process.

8. Will resetting the OBDII code P0604 in a Subaru make it go away permanently?

Resetting the OBDII code P0604 in a Subaru may temporarily clear the error code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem to prevent recurrence.

9. How much does it cost to repair the P0604 code in a Subaru?

The cost of repairing the P0604 code in a Subaru can vary depending on the extent of the damage, the parts needed for replacement, and the labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

10. Can the P0604 code in a Subaru cause other problems if left unaddressed?

If left unaddressed, the P0604 code in a Subaru can potentially lead to more serious issues such as engine damage, increased fuel consumption, and safety hazards due to unexpected stalling. It is crucial to resolve the problem promptly to avoid further complications.

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