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AutoCodes – Toyota – P0351 Toyota

P0351 Toyota Code - Ignition Coil 1 Primary/Secondary Circuit

Quick Answer

A Direct Ignition System (DIS) is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil assembly and one spark plug is connected to the end of each secondary wiring. Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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
P0351 Toyota indicates Ignition Coil 1 Primary/Secondary Circuit.
Common causes
Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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 104,463
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Aug 26, 2022
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Code P0351 Toyota Description

A Direct Ignition System (DIS) is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil assembly and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The spark of the spark plugs passes from the center electrode to the ground electrode.
The Engine Control Module (ECM) determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches the current supplied to the primary coil on and off. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the ECM for each cylinder ignition.
If the ECM does not receive any IGF signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and stores a Diagnostic Trouble Code (DTC).
OBDII Code P0351 Toyota - Ignition Coil 1 Primary/Secondary Circuit - AutoCodes.com
P0351 Toyota Code - Ignition Coil 1 Primary/Secondary Circuit
What does this mean?

What are the Possible Causes of the DTC P0351 Toyota?

  • Faulty Ignition Coil 1
  • Ignition Coil 1 harness is open or shorted
  • Ignition Coil 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0351 Toyota?

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 P0351 Toyota 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 P0351 Toyota code?

Need more information on how to fix the P0351 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0351 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 Toyota Code

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

- Common symptoms include engine misfires, rough idling, loss of power, and illuminated check engine light.

2. What does the OBDII code P0351 for Toyota mean?

- The code indicates a problem with the ignition coil 1 primary/secondary circuit in the vehicle's ignition system.

3. What are the possible causes of OBDII code P0351 in a Toyota?

- Potential causes include 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 issue related to OBDII code P0351 on my Toyota?

- Diagnose by checking the ignition coil and related wiring for damage, testing the ignition coil's resistance, and scanning the ECM for fault codes.

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

- It is not recommended to drive the vehicle with this code as it can lead to further damage and poor performance.

6. How can I repair OBDII code P0351 in my Toyota?

- Repair involves replacing the faulty ignition coil, repairing any damaged wiring, and clearing the fault code from the ECM.

7. Are there any preventive maintenance tips to avoid OBDII code P0351 in a Toyota?

- Regularly inspect and maintain the ignition system components, such as ignition coils, spark plugs, and wiring, to prevent issues.

8. Can a DIY enthusiast fix OBDII code P0351 in a Toyota?

- Depending on your skill level, you may be able to replace the ignition coil yourself, but diagnosing and repairing wiring issues may require professional help.

9. How much does it cost to fix OBDII code P0351 in a Toyota?

- The cost can vary depending on the extent of the issue, but typically, replacing an ignition coil can range from $100 to $300, including labor.

10. Will resetting the check engine light resolve OBDII code P0351 in a Toyota?

- Resetting the light may temporarily turn it off, but the underlying issue causing the code will still need to be diagnosed and repaired to prevent further problems.

Discuss the causes and fixes for P0351 Toyota OBDII Code

Submit a New Comment

  • I am getting codes p0351, p0354, and p0341 on my 2003 toyota camry 4 cylinder. I've replaced the camshaft position sensor and I cannot get the engine to start in the mornings. But after it has sat in the sun all day it starts in the afternoon time. I've ordered four new coil packs and don't know what to do if this doesn't fix the problem. I don't understand why it won't start on cool mornings but fires right up in the afternoon time.

    Reply to Comment

  • Sounds like one the sensor has poor connection. You should start by disconnecting and reconnecting the sensors. Make sure the connectors are firmly connected.

    Reply to Comment

  • i have same problem but my car is not to start

    Reply to Comment

  • hello ,
    i have a corolla 2007 , some times it looks like it goes of and the machine is shaking i checked with a auto mechanic he connect a computer and show ( coil c primary and secondary need to check ) and then i replaced the coil with other coil in cylinder 4th but steel i have the same problem is something wrong with ECM its not all the time some times it happen anyone cane help me please ?

    Reply to Comment

  • You swap the ignition coils and got the same code (P0351) ?

    If you get the same code, even by swapping the ignition coils, then the problem is either the ignition coil connector or the wire from the ignition coil to the Engine Control Module (ECM)

    Reply to Comment

  • Did you figure this out? I am having the same exact problem.

    Reply to Comment

  • I replaced the crankshaft position sensor and now its starting. I wanted to update in case anyone found this and needed an answer.

    Reply to Comment
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