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P0328 2001 Toyota Highlander Code - Knock Sensor 1 Circuit High Input

Quick Answer

The P0328 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Knock Sensor 1 Circuit having a high input. Common causes include Faulty knock sensor, Wiring harness issues, Corrosion or poor connections in the sensor circuit. 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
P0328 2001 Toyota Highlander indicates Knock Sensor 1 Circuit High Input.
Common causes
Common causes include Faulty knock sensor, Wiring harness issues, Corrosion or poor connections in the sensor circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0328 2001 Toyota Highlander Description

The P0328 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Knock Sensor 1 Circuit having a high input. The knock sensor is a crucial component in the engine management system that detects abnormal combustion in the engine, known as engine knock or detonation. When the knock sensor detects these abnormal vibrations, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage.

OBDII Code P0328 2001 Toyota Highlander - Knock Sensor 1 Circuit High Input
P0328 2001 Toyota Highlander Code - Knock Sensor 1 Circuit High Input

Common Causes of P0328 2001 Toyota Highlander

  1. Faulty knock sensor
  2. Wiring harness issues
  3. Corrosion or poor connections in the sensor circuit
  4. Engine mechanical problems causing abnormal vibrations
  5. ECM software or hardware issues

Symptoms of P0328 2001 Toyota Highlander

  1. Engine knocking or pinging noises
  2. Decreased engine performance
  3. Reduced fuel efficiency
  4. Illuminated check engine light
  5. Engine stalling or hesitation

How to Fix P0328 2001 Toyota Highlander

  1. Begin by locating the knock sensor, typically mounted on the engine block.
  2. Inspect the wiring harness connected to the knock sensor for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the knock sensor using a multimeter to check for proper resistance and continuity. Replace the sensor if it fails the test.
  4. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the code does not return.
  5. If the code persists, further diagnostics may be needed to identify any underlying engine mechanical issues causing abnormal vibrations.

Cost to Fix P0328 2001 Toyota Highlander

The cost of repairing a P0328 code on a 2001 Toyota Highlander can vary depending on the specific cause of the issue. On average, the cost of replacing a knock sensor ranges from $150 to $250, including parts and labor. Additional costs may apply if wiring harness repairs or further diagnostics are required. It's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to ensure a competitive price.

What does this mean?

Tech Notes for P0328 2001 Toyota Highlander

The P0328 code means that the Knock Sensor is not working properly. Problems with the knock sensor will not cause an engine performance problems. Replacing the knock sensor usually takes care of the problem.



You maybe also consider replacing the knock sensor short harness to avoid future problems.

If you have a V6 Toyota Highlander, it is recommended you replace both knock sensors and short harness to avoid re-doing the labor since it is alot of work, since it is located under the intake manifold.

When is the Code Detected?

An excessively high voltage from the sensor is sent to Electronic Control Module (ECM)

Need more information about the P0328 2001 Toyota Highlander 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 P0328 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0328 in a 2001 Toyota Highlander?

- Common symptoms include engine knocking or pinging noises, reduced engine performance, and the illumination of the check engine light.

2. What does the OBDII code P0328 "Knock Sensor 1 Circuit High Input" mean for a 2001 Toyota Highlander?

- This code indicates that the engine control module (ECM) has detected a high voltage signal from the knock sensor 1 circuit.

3. What are the possible causes of OBDII code P0328 in a 2001 Toyota Highlander?

- Potential causes include a faulty knock sensor, damaged wiring or connectors in the knock sensor circuit, or a problem with the ECM.

4. How can I diagnose the issue causing OBDII code P0328 in my 2001 Toyota Highlander?

- Diagnosing this code typically involves testing the knock sensor, inspecting the wiring and connectors for damage, and checking the ECM for any faults.

5. Can I continue driving my 2001 Toyota Highlander with OBDII code P0328 present?

- It is not recommended to drive the vehicle with this code active, as it can lead to engine damage and reduced performance over time.

6. Is it possible to reset the OBDII code P0328 in a 2001 Toyota Highlander by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it will likely return if the underlying issue causing the high input signal is not addressed.

7. How much does it typically cost to repair OBDII code P0328 in a 2001 Toyota Highlander?

- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the knock sensor, repairing wiring, or addressing ECM issues.

8. Are there any DIY repair tips for addressing OBDII code P0328 in a 2001 Toyota Highlander?

- DIYers may attempt to inspect the knock sensor and wiring themselves, but diagnosing and repairing electrical issues can be complex and may require professional help.

9. Can a faulty knock sensor cause other problems in a 2001 Toyota Highlander besides triggering OBDII code P0328?

- Yes, a faulty knock sensor can lead to poor fuel economy, engine misfires, and potentially even engine damage if not addressed promptly.

10. How long does it take to repair OBDII code P0328 in a 2001 Toyota Highlander at a professional mechanic or dealership?

- The repair time can vary based on the exact cause of the code, but it typically takes a few hours to diagnose and fix the issue using professional diagnostic equipment and tools.

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