AutoCodes – Toyota – P0354 2007 Toyota Prius

P0354 2007 Toyota Prius Code - Ignition Coil 4 Primary/Secondary Circuit

Quick Answer

The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 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: P0354 2007 Toyota Prius indicates Ignition Coil 4 Primary/Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 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 5,774

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
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0354 2007 Toyota Prius Description

The ignition system on the vehicle uses individual ignition coils for each cylinder. The Engine Control Module (ECM) controls each ignition coil operation. The ECM sends a ON/OFF signal to energize the ignition coil to create a spark at the spark plug when a spark is required at the cylinder.

OBDII Code P0354 2007 Toyota Prius - Ignition Coil 4 Primary/Secondary Circuit - AutoCodes.com — P0354 2007 Toyota Prius Code - Ignition Coil 4 Primary/Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P0354 2007 Toyota Prius?

Faulty Ignition Coil 4
Ignition Coil 4 harness is open or shorted
Ignition Coil 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0354 2007 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

Ignition Coil "D" refers to coil #4

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0354 2007 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 P0354 2007 Toyota Prius code?

Need more information on how to fix the P0354 2007 Toyota Prius 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 P0354 2007 Toyota Prius Code

1. What does OBDII code P0354 for a 2007 Toyota Prius indicate?

The code P0354 on a 2007 Toyota Prius specifically refers to the Ignition Coil 4 Primary/Secondary Circuit malfunction.

2. What are common symptoms of OBDII code P0354 in a 2007 Toyota Prius?

Common symptoms of OBDII code P0354 in a 2007 Toyota Prius include engine misfires, rough idling, loss of power, and illuminated Check Engine Light.

3. What causes the OBDII code P0354 in a 2007 Toyota Prius?

The OBDII code P0354 in a 2007 Toyota Prius is typically caused by a faulty ignition coil, wiring issues in the ignition coil circuit, or a problem with the engine control module (ECM).

4. How can I diagnose the cause of OBDII code P0354 in my 2007 Toyota Prius?

To diagnose the cause of OBDII code P0354 in a 2007 Toyota Prius, you can perform a visual inspection of the ignition coil and its wiring, test the ignition coil using a multimeter, and check for any loose connections or corrosion in the circuit.

5. Can I still drive my 2007 Toyota Prius with OBDII code P0354?

It is not recommended to drive your 2007 Toyota Prius with OBDII code P0354, as it can lead to further engine damage and potential safety hazards. It is best to address the issue promptly.

6. How do I repair OBDII code P0354 in a 2007 Toyota Prius?

Repairing OBDII code P0354 in a 2007 Toyota Prius involves replacing the faulty ignition coil (specifically Coil 4), repairing any damaged wiring, and clearing the trouble codes using an OBDII scanner.

7. Are there any tips to prevent OBDII code P0354 from recurring in my 2007 Toyota Prius?

To prevent OBDII code P0354 from recurring in your 2007 Toyota Prius, ensure regular maintenance of the ignition system, use high-quality ignition coils, and address any issues with the wiring promptly.

8. Can a DIY enthusiast fix OBDII code P0354 in a 2007 Toyota Prius?

A DIY enthusiast with the necessary tools and knowledge of automotive repair can potentially fix OBDII code P0354 in a 2007 Toyota Prius by following repair guides and being cautious while working on the ignition system.

9. How much does it cost to repair OBDII code P0354 in a 2007 Toyota Prius?

The cost to repair OBDII code P0354 in a 2007 Toyota Prius can vary depending on the root cause of the issue, the cost of replacement parts, and whether you choose to do the repair yourself or take it to a professional mechanic.

10. Should I reset the OBDII code P0354 after repairing my 2007 Toyota Prius?

After repairing OBDII code P0354 in your 2007 Toyota Prius, it is recommended to reset the trouble codes using an OBDII scanner to clear the Check Engine Light and ensure the issue has been successfully resolved.