P0657 2009 Toyota Prius Code - Actuator Supply Voltage Circuit Open
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 harness is open or shorted, Engine Control Module circuit poor electrical connection. 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
- P0657 2009 Toyota Prius indicates Actuator Supply Voltage Circuit Open.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module circuit poor electrical connection.
- 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 P0657 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 P0657 2009 Toyota Prius?
- Faulty Engine Control Module (ECM)
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
- Engine Control Module Programming update
How to Fix the DTC P0657 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 P0657 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.
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Frequently Asked Questions about P0657 2009 Toyota Prius Code
1. What are the common symptoms of OBDII code P0657 on a 2009 Toyota Prius?
- The common symptoms include the Check Engine Light (CEL) illuminating on the dashboard and possible issues with the vehicle's performance, such as reduced power or acceleration.
2. What does the OBDII code P0657 "Actuator Supply Voltage Circuit Open" mean for a 2009 Toyota Prius?
- This code indicates that there is an open circuit in the actuator supply voltage circuit, which can disrupt the proper functioning of various components in the vehicle.
3. What are the possible causes of OBDII code P0657 on a 2009 Toyota Prius?
- The potential causes of this code include a faulty actuator, damaged wiring or connectors in the circuit, a blown fuse, or a problem with the engine control module (ECM).
4. How can I diagnose the OBDII code P0657 on my 2009 Toyota Prius?
- Diagnosing this code usually involves using a scan tool to retrieve the code and then inspecting the actuator, wiring, connectors, and fuses related to the actuator supply voltage circuit for any signs of damage or corrosion.
5. Can I still drive my 2009 Toyota Prius with the OBDII code P0657 present?
- It is not recommended to drive the vehicle with this code present, as it can affect the performance and safety of the car. It's best to address the issue promptly to prevent further damage.
6. How can I repair OBDII code P0657 on a 2009 Toyota Prius?
- Repairing this code typically involves fixing the open circuit in the actuator supply voltage circuit by replacing any faulty components, repairing damaged wiring or connectors, and ensuring proper connections.
7. Is it necessary to reset the OBDII code P0657 after repairing the issue on a 2009 Toyota Prius?
- Yes, it is recommended to clear the code using a scan tool after repairing the underlying problem. This will reset the Check Engine Light and allow you to monitor if the issue has been successfully resolved.
8. Can a DIY enthusiast fix the OBDII code P0657 on a 2009 Toyota Prius?
- While some DIY enthusiasts may have the skills to diagnose and repair this code, it is recommended to consult a professional mechanic for a proper diagnosis and repair to ensure the issue is resolved correctly.
9. How much does it cost to fix OBDII code P0657 on a 2009 Toyota Prius?
- The cost of fixing this code can vary depending on the specific cause of the issue and the labor rates in your area. It's best to get a diagnosis from a mechanic to determine the exact cost.
10. How often does OBDII code P0657 occur in a 2009 Toyota Prius?
- The occurrence of this code can vary based on factors such as the vehicle's age, maintenance history, and driving conditions. If the issue is not addressed promptly, it may occur more frequently over time.
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