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P0604 KIA 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 KIA 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 15,913
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0604 KIA 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 KIA - Internal Control Module Random Access Memory Error - AutoCodes.com
P0604 KIA Code - Internal Control Module Random Access Memory Error
What does this mean?

What are the Possible Causes of the DTC P0604 KIA?

  • 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 KIA?

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 KIA 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 KIA code?

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

Need Help with the Code?

Get the P0604 KIA 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 KIA Code

1. What does the OBDII code P0604 mean for a KIA?

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 code P0604 in a KIA?

Symptoms may include engine misfires, poor fuel efficiency, difficulty starting, stalling, erratic idling, and the check engine light illuminating.

3. What causes the P0604 code to appear on a KIA?

Common causes include a faulty ECM, electrical issues like poor connections or damaged wiring, or a software glitch within the ECM.

4. Can a weak battery trigger the P0604 code on a KIA?

Yes, a weak or failing battery can cause voltage fluctuations, potentially leading to internal memory errors in the ECM.

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

Technicians typically perform a visual inspection of wiring and connectors, test the battery and alternator, and use specialized diagnostic tools to assess the ECM’s functionality.

6. Is it safe to drive a KIA with the P0604 code?

While the vehicle may still run, driving with this code can lead to unpredictable engine behavior and potential safety concerns. It’s best to address the issue promptly.

7. How can the P0604 code be fixed in a KIA?

Repairs may include replacing or reprogramming the ECM, repairing damaged wiring, or addressing battery and electrical issues causing the error.

8. Does the P0604 code always mean the ECM needs replacement?

No, sometimes the issue can be resolved by fixing wiring problems or reprogramming the ECM rather than replacing it.

9. Can the P0604 code be cleared without repairing the issue?

Clearing the code temporarily may work, but the problem will likely return unless the underlying issue is fixed.

10. What is the cost of repairing the P0604 code in a KIA?

Repair costs vary widely depending on whether the ECM requires replacement or reprogramming, ranging from $100 to over $1,000.

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