P0604 2009 Toyota Prius 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 2009 Toyota Prius 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.
Code P0604 2009 Toyota Prius Description
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.
What are the Possible Causes of the DTC P0604 2009 Toyota Prius?
- 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 2009 Toyota Prius?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0604 2009 Toyota Prius 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 2009 Toyota Prius code?
Need more information on how to fix the P0604 2009 Toyota Prius code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0604 2009 Toyota Prius code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0604 2009 Toyota Prius Code
What are the common symptoms of OBDII code P0604 on a 2009 Toyota Prius?
The common symptoms of OBDII code P0604 on a 2009 Toyota Prius include the check engine light illuminating on the dashboard, potential drivability issues such as rough idling or poor acceleration, and in some cases, the vehicle may go into a "limp mode" where it operates at reduced power.
What are the possible causes of OBDII code P0604 on a 2009 Toyota Prius?
The possible causes of OBDII code P0604 on a 2009 Toyota Prius are typically related to issues with the internal control module random access memory (RAM), such as a corrupted or faulty memory module, wiring issues, or a malfunctioning control module itself.
How can I diagnose OBDII code P0604 on a 2009 Toyota Prius?
Diagnosing OBDII code P0604 on a 2009 Toyota Prius usually requires a professional OBDII scanner to read the code and determine the exact cause of the issue. It is recommended to consult a qualified mechanic or dealership for an accurate diagnosis.
Is it safe to continue driving with OBDII code P0604 on a 2009 Toyota Prius?
It is not recommended to continue driving with OBDII code P0604 on a 2009 Toyota Prius, as it can lead to potential drivability issues and further damage to the vehicle's internal control module. It is best to have the issue diagnosed and repaired as soon as possible.
How can OBDII code P0604 on a 2009 Toyota Prius be repaired?
Repairing OBDII code P0604 on a 2009 Toyota Prius usually involves addressing the underlying cause of the issue, which may include repairing or replacing the internal control module random access memory, fixing any wiring issues, or replacing the control module itself. It is recommended to consult a professional mechanic for proper repair.
Can resetting the OBDII code P0604 on a 2009 Toyota Prius fix the issue?
Resetting the OBDII code P0604 on a 2009 Toyota Prius may temporarily turn off the check engine light, but it will not fix the underlying issue causing the code. It is important to diagnose and repair the root cause of the problem to prevent further issues.
What happens if OBDII code P0604 on a 2009 Toyota Prius is ignored?
Ignoring OBDII code P0604 on a 2009 Toyota Prius can lead to potential drivability issues, reduced fuel efficiency, and further damage to the vehicle's internal control module. It is important to address the issue promptly to avoid costly repairs down the line.
Is OBDII code P0604 a common issue in 2009 Toyota Prius vehicles?
While OBDII code P0604 is not extremely common in 2009 Toyota Prius vehicles, it can still occur due to various factors such as aging components, electrical issues, or other internal control module malfunctions. Regular maintenance and prompt diagnostics can help prevent this code from appearing.
Discuss the causes and fixes for P0604 2009 Toyota Prius OBDII Code
Code P0604 2009 Toyota Prius comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
