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AutoCodes – Toyota – P0657 Toyota

P0657 Toyota Code - Actuator Supply Voltage Circuit Open

Quick Answer

The Engine Control Module (ECM) monitors the output voltage 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 Toyota 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.
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Code Popularity 20,443
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 29, 2024
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Code P0657 Toyota Description

The Engine Control Module (ECM) monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage is usually 0 V when the ignition switch is turned off. If the output voltage is higher than 7 V when the ignition switch is turned off, the ECM illuminates the MIL and stores the Diagnostic Trouble Code (DTC) when the ignition switch is turned ON.
OBDII Code P0657 Toyota - Actuator Supply Voltage Circuit Open - AutoCodes.com
P0657 Toyota Code - Actuator Supply Voltage Circuit Open
What does this mean?

What are the Possible Causes of the DTC P0657 Toyota?

  • Faulty Engine Control Module (ECM)
  • Engine Control Module harness is open or shorted
  • Engine Control Module circuit poor electrical connection

How to Fix the DTC P0657 Toyota?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0657 Toyota 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 P0657 Toyota code?

Need more information on how to fix the P0657 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0657 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 P0657 Toyota Code

1. What does OBDII code P0657 mean on a Toyota vehicle?

P0657 indicates an "Actuator Supply Voltage Circuit Open," meaning the ECM has detected an open circuit or voltage issue in the actuator supply line.

2. What are the common symptoms of code P0657 in a Toyota?

Symptoms can include poor engine performance, reduced throttle response, illuminated check engine light, or issues with various actuators like throttle, transmission, or fuel system components.

3. What causes the P0657 code to appear on a Toyota?

Common causes include damaged or corroded wiring, a faulty actuator, a malfunctioning ECM, or a poor electrical connection in the actuator supply circuit.

4. Can I drive my Toyota with a P0657 code?

While the vehicle may still be drivable, it’s not recommended as the issue can cause performance problems and potentially lead to further damage.

5. How do I diagnose the P0657 code on a Toyota?

Start by visually inspecting the wiring and connectors for damage or corrosion, then test the actuator supply circuit for continuity and proper voltage using a multimeter.

6. What tools are needed to fix a P0657 code in a Toyota?

You’ll typically need a multimeter, an OBDII scanner, wiring diagrams for your vehicle, and possibly basic hand tools to access the actuator circuits.

7. Can a faulty ECM cause the P0657 code in a Toyota?

Yes, a malfunctioning ECM can fail to provide the correct voltage to the actuator supply circuit, triggering the P0657 code.

8. How much does it cost to repair the P0657 code on a Toyota?

Repair costs vary depending on the root cause but can range from $100 to $1,000, depending on whether wiring repairs, actuator replacement, or ECM replacement is required.

9. How can I prevent the P0657 code from reoccurring in my Toyota?

Regular maintenance, including inspecting and cleaning wiring connections, can help prevent issues with the actuator supply voltage circuit.

10. Will clearing the code fix the P0657 issue on my Toyota?

Clearing the code will only temporarily remove it. The underlying issue must be diagnosed and repaired to prevent the code from returning.

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