AutoCodes – Toyota – P0354 2007 Toyota Highlander

P0354 2007 Toyota Highlander 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 Highlander 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 5,846

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0354 2007 Toyota Highlander 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 Highlander - Ignition Coil 4 Primary/Secondary Circuit - AutoCodes.com — P0354 2007 Toyota Highlander Code - Ignition Coil 4 Primary/Secondary Circuit

What does this mean?

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

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 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 P0354 2007 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 P0354 2007 Toyota Highlander code?

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

1. What does OBDII code P0354 on a 2007 Toyota Highlander indicate?

The code P0354 indicates a problem with the ignition coil 4 primary/secondary circuit in your vehicle.

2. What are the common symptoms of OBDII code P0354?

Common symptoms of this code include engine misfires, rough idling, loss of power, and a noticeable decrease in fuel efficiency.

3. What are the possible causes of OBDII code P0354 in a 2007 Toyota Highlander?

Potential causes of this code include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, or issues with the Engine Control Module (ECM).

4. How can I diagnose the issue related to OBDII code P0354?

Diagnosing the problem may involve visually inspecting the ignition coil and its connections, testing the coil with a multimeter, checking for damaged wiring, and scanning the ECM for any related fault codes.

5. Is it safe to continue driving with OBDII code P0354 present?

It is not recommended to drive with this code present, as it can lead to further damage to the ignition system and potentially cause more severe engine issues.

6. How can I repair OBDII code P0354 in my 2007 Toyota Highlander?

Repairing this code typically involves replacing the faulty ignition coil, repairing any damaged wiring or connectors, and clearing the code with a diagnostic scanner.

7. Can I replace the ignition coil myself to fix OBDII code P0354?

If you have the necessary tools and experience working on vehicles, you can replace the ignition coil yourself. However, if you are unsure, it is best to have a professional mechanic handle the repair.

8. Are there any preventative maintenance tips to avoid OBDII code P0354 in the future?

To prevent this code from reoccurring, it is recommended to regularly inspect the ignition system components, replace spark plugs at the manufacturer's recommended intervals, and ensure all electrical connections are secure.

9. Will resetting the trouble codes make OBDII code P0354 disappear permanently?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing P0354 is not addressed, the code is likely to reappear during driving conditions.

10. How much does it typically cost to repair OBDII code P0354 in a 2007 Toyota Highlander?

The cost of repairing this code can vary depending on the exact cause of the issue, but it generally ranges from $100 to $300 for parts and labor at a repair shop.