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Engine-Codes – Toyota – P0354 Toyota

P0354 Toyota Code - Ignition Coil 4 Primary/Secondary Circuit

Quick Answer

The P0354 code for Toyota vehicles indicates an issue with the ignition coil for cylinder 4, specifically in the primary or secondary circuit. Common causes include Faulty ignition coil for cylinder 4, Damaged wiring or connectors in the ignition coil circuit, Issues with the engine control module (ECM). 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 Toyota indicates Ignition Coil 4 Primary/Secondary Circuit.
Common causes
Common causes include Faulty ignition coil for cylinder 4, Damaged wiring or connectors in the ignition coil circuit, Issues with the engine control module (ECM).
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 Aug 30, 2024
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Code P0354 Toyota Description

The P0354 code for Toyota vehicles indicates an issue with the ignition coil for cylinder 4, specifically in the primary or secondary circuit. The ignition coil is a crucial component responsible for generating the high voltage needed to ignite the air-fuel mixture in the combustion chamber. When this circuit fails, it can lead to misfires, poor engine performance, and potentially even engine stalling.

OBDII Code P0354 Toyota - Ignition Coil 4 Primary/Secondary Circuit
P0354 Toyota Code - Ignition Coil 4 Primary/Secondary Circuit

Common Causes of P0354 Toyota

  1. Faulty ignition coil for cylinder 4
  2. Damaged wiring or connectors in the ignition coil circuit
  3. Issues with the engine control module (ECM)
  4. Spark plug issues
  5. Engine overheating

Symptoms of P0354 Toyota

  1. Rough idling
  2. Engine misfires
  3. Loss of power
  4. Decreased fuel efficiency
  5. Engine stalling

How to Fix P0354 Toyota

  1. Diagnose the issue using a scan tool to verify the P0354 code.
  2. Inspect the ignition coil for cylinder 4 and check for any visible damage or signs of wear.
  3. Test the wiring and connectors in the ignition coil circuit for continuity and proper connections.
  4. Replace the ignition coil for cylinder 4 if it is found to be faulty.
  5. Clear the diagnostic trouble codes, perform a test drive, and recheck for any remaining issues.

Cost to Fix P0354 Toyota

The cost of repairing the ignition coil for cylinder 4 can vary depending on the make and model of the vehicle, as well as the labor rates in your area. On average, the parts for this repair can range from $50 to $150, while labor costs can add an additional $100 to $200. Overall, you can expect to pay between $150 and $350 for this repair at most auto repair shops. However, it's recommended to obtain quotes from local shops to get a more accurate estimate based on your specific circumstances.

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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.

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