AutoCodes – Toyota – P0604 2007 Toyota Camry

P0604 2007 Toyota Camry Code - Internal Control Module Random Access Memory Error

Quick Answer

The Engine Control Module (ECM) continuously monitors its internal memory status, internal circuits, and output signals to the throttle actuator. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) Harness power supply circuit is open or shorted, Engine Control Module (ECM) Programming. 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 2007 Toyota Camry indicates Internal Control Module Random Access Memory Error.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) Harness power supply circuit is open or shorted, Engine Control Module (ECM) Programming.
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 1,785

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 2007 Toyota Camry Description

The Engine Control Module (ECM) continuously monitors its internal memory status, internal circuits, and output signals to the throttle actuator. This selfâˆ’check insures that the ECM is functioning properly. If any malfunction is detected, the ECM will set the code and illuminate the engine light.
The ECM memory status is diagnosed by internal mirroring of the main CPU and the sub CPU to detect Random Access Memory (RAM) errors. The two CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or deviate from the standards, 2) the signals sent to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage, and 4) any other ECM malfunction is found.

OBDII Code P0604 2007 Toyota Camry - Internal Control Module Random Access Memory Error - AutoCodes.com — P0604 2007 Toyota Camry Code - Internal Control Module Random Access Memory Error

What does this mean?

What are the Possible Causes of the DTC P0604 2007 Toyota Camry?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) Harness power supply circuit is open or shorted
Engine Control Module (ECM) Programming

How to Fix the DTC P0604 2007 Toyota Camry?

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 2007 Toyota Camry 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 2007 Toyota Camry code?

Need more information on how to fix the P0604 2007 Toyota Camry 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 2007 Toyota Camry Code

What does the OBDII code P0604 mean on a 2007 Toyota Camry?

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

What are the common symptoms of the P0604 code in a Toyota Camry?

Symptoms may include the Check Engine Light illuminating, engine stalling, poor performance, difficulty starting, or no noticeable symptoms at all.

What causes the P0604 code to appear?

Common causes include a faulty ECM, damaged wiring or connections to the ECM, software corruption, or electrical issues such as low battery voltage.

Is it safe to drive with a P0604 code on a 2007 Toyota Camry?

Driving with a P0604 code is generally not recommended, as it could lead to unpredictable engine behavior or stalling, creating potential safety hazards.

How can I diagnose the P0604 code on my Toyota Camry?

Start by checking the battery voltage, inspecting ECM-related wiring and connectors, and ensuring no visible damage or corrosion. If no issues are found, further diagnosis may require specialized tools to test the ECM.

Can a weak or failing battery trigger the P0604 code?

Yes, a weak or failing battery can cause low voltage to the ECM, potentially resulting in the P0604 code.

How do I fix the P0604 code on a 2007 Toyota Camry?

Possible fixes include repairing or replacing damaged wiring, reprogramming or updating the ECM, or replacing the ECM if it is determined to be faulty.

How much does it typically cost to repair a P0604 code?

Repair costs can vary widely but may range from $100 for minor wiring repairs to over $1,000 if the ECM requires replacement and programming.

Can the P0604 code be cleared without fixing the issue?

Clearing the code without addressing the root cause may temporarily turn off the Check Engine Light, but the issue is likely to return until properly resolved.

Do I need to replace the ECM to fix a P0604 code?

Not necessarily. The ECM only needs replacement if it is confirmed as the source of the problem after ruling out wiring, software, and electrical issues.