AutoCodes – Toyota – P0606 2001 Toyota Highlander

P0606 2001 Toyota Highlander Code - ECM Processor 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: P0606 2001 Toyota Highlander indicates ECM Processor 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 2,665

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 Dec 05, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0606 2001 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 P0606 2001 Toyota Highlander - ECM Processor Error - AutoCodes.com — P0606 2001 Toyota Highlander Code - ECM Processor Error

What does this mean?

What are the Possible Causes of the DTC P0606 2001 Toyota Highlander?

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 P0606 2001 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0606 2001 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 P0606 2001 Toyota Highlander code?

Need more information on how to fix the P0606 2001 Toyota Highlander code? Get Access to Factory Service Manuals

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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 P0606 2001 Toyota Highlander Code

1. What does the OBDII code P0606 on a 2001 Toyota Highlander mean?

The P0606 code indicates an ECM Processor Error, pointing to an issue with the Engine Control Module's internal processor.

2. What are the common symptoms of a P0606 error in a 2001 Toyota Highlander?

Common symptoms of a P0606 code may include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine Light.

3. What are the possible causes of a P0606 code in a 2001 Toyota Highlander?

Potential causes of a P0606 code include a faulty Engine Control Module (ECM), wiring issues, software glitches, or a malfunction within the ECM itself.

4. How can I diagnose a P0606 code in my 2001 Toyota Highlander?

Diagnosing a P0606 code typically involves using a scan tool to read the code, checking the ECM connections, inspecting the wiring for damage, and testing the ECM for proper functionality.

5. Can a P0606 error be fixed without professional help on a 2001 Toyota Highlander?

While some DIY enthusiasts may attempt to address a P0606 code by checking connections and wiring, resolving internal ECM issues often requires professional diagnosis and repair.

6. Is it safe to continue driving with a P0606 code in a 2001 Toyota Highlander?

Continuing to drive with a P0606 code can potentially cause further damage to the engine or other components, so it's recommended to address the issue promptly.

7. How much does it typically cost to repair a P0606 code in a 2001 Toyota Highlander?

The cost of repairing a P0606 code can vary depending on the exact cause of the issue, but it may involve replacing the ECM, which can range from a few hundred to over a thousand dollars.

8. Are there any preventive measures to avoid a P0606 code in a 2001 Toyota Highlander?

Regularly servicing your vehicle, addressing any engine performance issues promptly, and ensuring proper maintenance can help reduce the risk of encountering a P0606 error.

9. Can a P0606 code affect fuel efficiency in a 2001 Toyota Highlander?

Yes, a P0606 code can impact fuel efficiency due to engine performance issues it may cause, such as rough idling or poor acceleration.

10. How long does it take to repair a P0606 code in a 2001 Toyota Highlander?

The repair time for a P0606 code can vary based on the specific issue and the availability of parts. It may take a few hours to a day or more to address the problem effectively.