AutoCodes – Toyota – P0328 2004 Toyota Prius

P0328 2004 Toyota Prius Code - Knock Sensor 1 Circuit High Input

Quick Answer

The knock sensor is attached to the cylinder block. Common causes include Faulty knock sensor, Knock sensor circuit poor electrical connection, Knock sensor harness is open or shorted. 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 2004 Toyota Prius indicates Knock Sensor 1 Circuit High Input.
Common causes: Common causes include Faulty knock sensor, Knock sensor circuit poor electrical connection, Knock sensor harness is open or shorted.
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 3,777

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0328 2004 Toyota Prius Description

The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the Engine Control Module (ECM).

OBDII Code P0328 2004 Toyota Prius - Knock Sensor 1 Circuit High Input - AutoCodes.com — P0328 2004 Toyota Prius Code - Knock Sensor 1 Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0328 2004 Toyota Prius?

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

How to Fix the DTC P0328 2004 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.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0328 2004 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.

Need more information about the P0328 2004 Toyota Prius 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 2004 Toyota Prius Code

1. What does the P0328 code mean on a 2004 Toyota Prius?

The P0328 code indicates a high input voltage signal from Knock Sensor 1, which is responsible for detecting engine knock or detonation.

2. What are the common symptoms of the P0328 code in a Toyota Prius?

Symptoms may include the Check Engine Light turning on, reduced engine performance, poor fuel economy, and in some cases, engine knocking or pinging.

3. What causes the P0328 code to appear in a 2004 Toyota Prius?

Common causes include a faulty knock sensor, damaged sensor wiring, poor electrical connections, or issues with the engine control module (ECM).

4. Can I drive my 2004 Toyota Prius with the P0328 code?

While it may be possible to drive the car, it is not recommended as the engine could suffer damage due to undetected knocking or improper ignition timing adjustments.

5. How do I diagnose the P0328 code on my Toyota Prius?

Diagnosis involves checking the knock sensor wiring and connectors for damage, testing the knock sensor with a multimeter, and scanning the ECM for additional related codes.

6. How do I fix the P0328 code in a 2004 Toyota Prius?

Repairs typically involve replacing the faulty knock sensor, repairing damaged wiring or connectors, or addressing issues with the ECM if necessary.

7. Does a faulty knock sensor affect fuel efficiency in a Toyota Prius?

Yes, a faulty knock sensor can lead to improper ignition timing, which may reduce fuel efficiency and overall engine performance.

8. Where is the knock sensor located in a 2004 Toyota Prius?

The knock sensor is usually located on the engine block, cylinder head, or intake manifold, near the combustion chambers.

9. How much does it cost to fix the P0328 code on a Toyota Prius?

Repair costs can vary but typically range from $150 to $400, depending on whether the knock sensor or wiring needs replacement and labor costs.

10. Can a P0328 code be caused by low-quality fuel?

While low-quality fuel can cause engine knocking, it is unlikely to trigger the P0328 code, which specifically relates to a sensor or electrical issue.