AutoCodes – Toyota – P0657 2002 Toyota Highlander

P0657 2002 Toyota Highlander 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 2002 Toyota Highlander 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 1,935

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 Jan 25, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0657 2002 Toyota Highlander Description

The Engine Control Module (ECM) continuously monitors its internal memory status, internal circuits, and output signals 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.
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 P0657 2002 Toyota Highlander - Actuator Supply Voltage Circuit Open - AutoCodes.com — P0657 2002 Toyota Highlander Code - Actuator Supply Voltage Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0657 2002 Toyota Highlander?

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 2002 Toyota Highlander?

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 P0657 2002 Toyota Highlander 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 2002 Toyota Highlander code?

Need more information on how to fix the P0657 2002 Toyota Highlander 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 P0657 2002 Toyota Highlander Code

1. What does OBDII code P0657 mean on a 2002 Toyota Highlander?

The P0657 code indicates a problem with the Actuator Supply Voltage Circuit Open in the vehicle's engine control module.

2. What are the common symptoms of a P0657 trouble code in a 2002 Toyota Highlander?

Common symptoms include illuminated Check Engine light, engine performance issues, stalling, or difficulty starting the vehicle.

3. What are the possible causes of a P0657 trouble code in a 2002 Toyota Highlander?

Potential causes may include a faulty actuator, damaged wiring or connectors in the actuator circuit, a defective engine control module, or a blown fuse.

4. How can I diagnose a P0657 trouble code in my 2002 Toyota Highlander?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the actuator circuit for any visible damage, and testing the voltage supply to the actuator.

5. What are some repair tips for fixing a P0657 trouble code in a 2002 Toyota Highlander?

Repair tips may include checking and repairing any damaged wiring or connectors, replacing a faulty actuator, resetting the engine control module, or replacing a blown fuse.

6. Can I drive my 2002 Toyota Highlander with a P0657 trouble code?

It is not recommended to drive the vehicle with a P0657 trouble code as it can lead to further engine damage or safety hazards. It's best to address the issue promptly.

7. How much does it cost to repair a P0657 trouble code in a 2002 Toyota Highlander?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Is the P0657 trouble code a serious issue in a 2002 Toyota Highlander?

While the severity of the issue can vary, it is important to address the P0657 code promptly to prevent potential engine damage or safety concerns while driving.

9. Can I reset the Check Engine light after fixing a P0657 trouble code in my 2002 Toyota Highlander?

Yes, once the underlying issue causing the P0657 code is resolved, you can use an OBDII scanner to clear the code and reset the Check Engine light.

10. How can I prevent a P0657 trouble code from occurring in my 2002 Toyota Highlander?

Regularly maintaining your vehicle, checking the wiring and connectors in the actuator circuit, and addressing any engine performance issues promptly can help prevent the recurrence of a P0657 trouble code.