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Engine-Codes – Toyota – P0351 2006 Toyota Highlander

P0351 2006 Toyota Highlander Code - Ignition Coil 1 Primary/Secondary Circuit

Quick Answer

The P0351 diagnostic trouble code (DTC) for a 2006 Toyota Highlander indicates a problem with the ignition coil 1 primary/secondary circuit. Common causes include Faulty ignition coil, Damaged or corroded wiring, 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
P0351 2006 Toyota Highlander indicates Ignition Coil 1 Primary/Secondary Circuit.
Common causes
Common causes include Faulty ignition coil, Damaged or corroded wiring, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0351 2006 Toyota Highlander Description

The P0351 diagnostic trouble code (DTC) for a 2006 Toyota Highlander indicates a problem with the ignition coil 1 primary/secondary circuit. The ignition coil is a crucial component of the vehicle's ignition system, responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel and air mixture in the engine cylinders. The primary circuit controls the power supply to the ignition coil, while the secondary circuit is responsible for delivering the high voltage spark to the spark plugs.

OBDII Code P0351 2006 Toyota Highlander - Ignition Coil 1 Primary/Secondary Circuit
P0351 2006 Toyota Highlander Code - Ignition Coil 1 Primary/Secondary Circuit

Common Causes of P0351 2006 Toyota Highlander

  1. Faulty ignition coil
  2. Damaged or corroded wiring
  3. Poor electrical connection
  4. ECM issues
  5. Spark plug issues

Symptoms of P0351 2006 Toyota Highlander

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Illumination of the Check Engine Light

How to Fix P0351 2006 Toyota Highlander

  1. Use a scan tool to verify the P0351 code and identify the specific ignition coil 1.
  2. Inspect the ignition coil, wiring, and connections for any visible damage or corrosion.
  3. Test the ignition coil using a multimeter to check for proper resistance and continuity.
  4. Replace the faulty ignition coil if necessary, ensuring proper installation and connection.
  5. Clear the DTC with the scan tool and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0351 2006 Toyota Highlander

The cost of repairing a P0351 code on a 2006 Toyota Highlander can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of a new ignition coil for this vehicle ranges from $50 to $150, while the labor cost for diagnosis and replacement can range from $100 to $300. Overall, you can expect to pay between $150 and $450 for this repair. It's recommended to contact local auto repair shops for accurate pricing based on your location and vehicle specifics.

When is the Code Detected?

Each ignition circuit is continuously monitored by the Engine Control Module (ECM). The test fails when the ECM does not receive a valid pulse signal from the ignition coil.

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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 P0351 2006 Toyota Highlander Code

1. What does the OBDII code P0351 mean for a 2006 Toyota Highlander?

P0351 indicates a malfunction in the Ignition Coil 1 Primary/Secondary Circuit, meaning the engine control module (ECM) detected an issue with the coil’s operation.

2. What are the symptoms of code P0351 in a 2006 Toyota Highlander?

Common symptoms include engine misfires, poor acceleration, rough idling, reduced fuel efficiency, and the check engine light turning on.

3. What causes the P0351 code on a 2006 Toyota Highlander?

Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a defective ECM, or spark plug issues.

4. Can I drive my 2006 Toyota Highlander with the P0351 code?

It’s not recommended to drive for extended periods with this code, as it can lead to further engine damage, reduced performance, and potentially unsafe driving conditions.

5. How do I fix the P0351 code on my 2006 Toyota Highlander?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or replacing the spark plugs. Testing the ECM may also be necessary.

6. How do you diagnose the P0351 code on a 2006 Toyota Highlander?

A mechanic will use an OBDII scanner to confirm the code, visually inspect the ignition coil and wiring, test the coil’s primary and secondary circuits, and check the spark plugs.

7. Can a bad spark plug cause the P0351 code?

Yes, a worn or damaged spark plug can cause the ignition coil to malfunction, triggering the P0351 code.

8. How much does it cost to repair the P0351 code on a 2006 Toyota Highlander?

Costs vary based on the specific issue, but replacing an ignition coil typically costs between $100 and $300, including labor.

9. Can I fix the P0351 code myself on a 2006 Toyota Highlander?

If you’re experienced with car repairs, you can attempt to replace the ignition coil or inspect wiring. However, it’s best to consult a professional for accurate diagnosis and repair.

10. What happens if the P0351 code is ignored?

Ignoring this code can lead to severe engine damage, increased emissions, poor performance, and potential failure of other ignition system components.

Discuss the causes and fixes for P0351 2006 Toyota Highlander OBDII Code

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  • i have a 2006 toyota highlander 3.3 v6 that died when driving now has 5 codes all related to ignition coils each cyl p0351,p0353,p0354,p0355,p0356 will start and run bad with key in start position when release key it die any help would be great Thanks

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  • We had a couple of vehicles with similar symptoms and the problem was faulty ignition coils. The engine will die because almost all the coils are bad. Unfortunately, other than the coils I have not seen any other component setting the those codes.

    Reply to Comment