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Engine-Codes – Toyota – P0351 2007 Toyota Highlander

P0351 2007 Toyota Highlander Code - Ignition Coil 1 Primary/Secondary Circuit

Quick Answer

The P0351 diagnostic trouble code (DTC) for a 2007 Toyota Highlander refers to an issue with the Ignition Coil 1 Primary/Secondary Circuit. Common causes include Faulty ignition coil: The most common cause of the P0351 code is a defective ignition coil for cylinder 1, which can fail due to age, heat, or electrical issues, Wiring issues: Damaged or corroded wiring in the ignition coil circuit can disrupt the flow of electricity and trigger the P0351 code, Faulty spark plugs: Worn or fouled spark plugs can place additional strain on the ignition coil, leading to premature failure. 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 2007 Toyota Highlander indicates Ignition Coil 1 Primary/Secondary Circuit.
Common causes
Common causes include Faulty ignition coil: The most common cause of the P0351 code is a defective ignition coil for cylinder 1, which can fail due to age, heat, or electrical issues, Wiring issues: Damaged or corroded wiring in the ignition coil circuit can disrupt the flow of electricity and trigger the P0351 code, Faulty spark plugs: Worn or fouled spark plugs can place additional strain on the ignition coil, leading to premature failure.
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 21, 2024
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Code P0351 2007 Toyota Highlander Description

The P0351 diagnostic trouble code (DTC) for a 2007 Toyota Highlander refers to an issue with the Ignition Coil 1 Primary/Secondary Circuit. This code indicates a problem with the electrical circuit that controls the ignition coil for cylinder 1 in the engine. The ignition coil is a crucial component of the ignition system, responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs. When the ignition coil fails or malfunctions, it can lead to misfires, rough idling, poor fuel economy, and even engine stalling.

OBDII Code P0351 2007 Toyota Highlander - Ignition Coil 1 Primary/Secondary Circuit
P0351 2007 Toyota Highlander Code - Ignition Coil 1 Primary/Secondary Circuit

Common Causes of P0351 2007 Toyota Highlander

  1. Faulty ignition coil: The most common cause of the P0351 code is a defective ignition coil for cylinder 1, which can fail due to age, heat, or electrical issues.
  2. Wiring issues: Damaged or corroded wiring in the ignition coil circuit can disrupt the flow of electricity and trigger the P0351 code.
  3. Faulty spark plugs: Worn or fouled spark plugs can place additional strain on the ignition coil, leading to premature failure.
  4. ECM issues: A malfunctioning engine control module (ECM) can send incorrect signals to the ignition coil, causing it to malfunction.
  5. Poor electrical connections: Loose or corroded electrical connections in the ignition coil circuit can prevent proper voltage delivery, resulting in the P0351 code.

Symptoms of P0351 2007 Toyota Highlander

  1. Engine misfires: The most common symptom associated with the P0351 code is engine misfires, which can manifest as rough idling, hesitation, or a noticeable loss of power during acceleration.
  2. Illuminated check engine light: When the engine control module (ECM) detects a problem with the ignition coil circuit, it will trigger the check engine light to alert the driver to the issue.
  3. Poor fuel economy: A malfunctioning ignition coil can lead to incomplete combustion in the engine, resulting in decreased fuel efficiency and increased fuel consumption.
  4. Engine stalling: In severe cases, a faulty ignition coil can cause the engine to stall unexpectedly, especially during idle or low-speed driving.

How to Fix P0351 2007 Toyota Highlander

  1. Diagnose the issue: Use a scan tool to retrieve the DTC and pinpoint the specific cause of the P0351 code, such as a faulty ignition coil, wiring issue, or ECM malfunction.
  2. Inspect the ignition coil: Test the ignition coil for cylinder 1 to determine if it is functioning properly. Replace the ignition coil if it is found to be defective.
  3. Check wiring and connections: Inspect the wiring harness and electrical connections in the ignition coil circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  4. Test spark plugs: Check the condition of the spark plugs and replace them if necessary to ensure proper ignition system performance.
  5. Clear codes and test drive: After completing the repairs, clear the DTC from the ECM memory and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0351 2007 Toyota Highlander

The typical repair costs for addressing the P0351 code on a 2007 Toyota Highlander can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new ignition coil, spark plugs, and any necessary wiring repairs. Keep in mind that the actual cost may vary based on the location of the repair shop, the make and model of the vehicle, and the hourly labor rates charged by the technician. It is advisable to obtain quotes from multiple auto repair shops to compare prices and ensure a fair and accurate estimate for the repair.

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 2007 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0351 in a 2007 Toyota Highlander?

The common symptoms of code P0351 include engine misfires, rough idling, loss of power, and the Check Engine Light illuminating on the dashboard.

2. What does the OBDII code P0351 indicate on a 2007 Toyota Highlander?

Code P0351 indicates a problem with the ignition coil 1 primary/secondary circuit in the ignition system of the vehicle.

3. What are the possible causes of OBDII code P0351 on a 2007 Toyota Highlander?

Possible causes of code P0351 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 OBDII code P0351 on my 2007 Toyota Highlander?

Diagnosing code P0351 typically involves inspecting the ignition coil and related wiring for any visible damage, checking the connectors for a secure connection, and using a multimeter to test the coil's resistance.

5. Can I still drive my 2007 Toyota Highlander with OBDII code P0351?

It is not recommended to drive your vehicle with code P0351 as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

6. How can I repair OBDII code P0351 on a 2007 Toyota Highlander?

To repair code P0351, you may need to replace the faulty ignition coil, repair any damaged wiring or connectors, or reprogram the engine control module (ECM) if necessary.

7. Are there any maintenance tips to prevent OBDII code P0351 in a 2007 Toyota Highlander?

Regularly inspecting and maintaining the ignition system components, such as the ignition coils, spark plugs, and wiring, can help prevent issues like code P0351 from occurring.

8. Will resetting the Check Engine Light resolve OBDII code P0351 on a 2007 Toyota Highlander?

Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing code P0351 is not addressed, the light is likely to come back on once the ECM detects the problem again.

9. Can a DIY enthusiast fix OBDII code P0351 in a 2007 Toyota Highlander?

While some DIY enthusiasts may have the skills to diagnose and repair code P0351, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved correctly.

10. How much does it cost to fix OBDII code P0351 on a 2007 Toyota Highlander?

The cost of fixing code P0351 can vary depending on the exact cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is advisable to get a diagnostic and repair estimate from a qualified mechanic.

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