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Engine-Codes – Generic – P1365

P1365 Code - Ignition Coil Secondary Circuit Failure

Quick Answer

When the diagnostic code P1365 is triggered, it indicates a problem with the ignition coil secondary circuit. Common causes include Faulty ignition coil, Damaged wiring in the ignition system, Worn-out spark plugs. 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
P1365 indicates Ignition Coil Secondary Circuit Failure.
Common causes
Common causes include Faulty ignition coil, Damaged wiring in the ignition system, Worn-out spark plugs.
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 06, 2024
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Code P1365 Description

When the diagnostic code P1365 is triggered, it indicates a problem with the ignition coil secondary circuit. The ignition coil is responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel in the engine's cylinders. A failure in the secondary circuit can lead to misfires, rough idling, decreased fuel efficiency, and potentially even engine stalling. Ignoring this issue can cause damage to other components in the ignition system and lead to more severe problems down the line. The underlying cause of this code could be a faulty ignition coil, damaged wiring, or issues with the spark plugs or ignition system.

OBDII Code P1365 - Ignition Coil Secondary Circuit Failure
P1365 Code - Ignition Coil Secondary Circuit Failure

Common Causes of P1365

  1. Faulty ignition coil
  2. Damaged wiring in the ignition system
  3. Worn-out spark plugs
  4. Issues with the ignition system components
  5. Electrical problems in the vehicle

Symptoms of P1365

  1. Engine misfires
  2. Rough idle
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Illuminated check engine light

How to Fix P1365

  1. Diagnose the specific cause of the issue by using a diagnostic scanner to pinpoint the problem within the ignition coil secondary circuit.
  2. Replace the faulty ignition coil if it is determined to be the cause of the problem.
  3. Check and repair any damaged wiring or connections in the ignition system.
  4. Inspect and replace any worn-out spark plugs.
  5. Test the ignition system to ensure proper function and clear the diagnostic code from the vehicle's computer.

Cost to Fix P1365

The typical repair costs for addressing an ignition coil secondary circuit failure can range from $150 to $400, including parts and labor. However, it's important to note that the actual cost can vary depending on the specific vehicle make and model, the location of the repair shop, and the extent of the repairs needed. Additionally, diagnostic time and labor rates can impact the final cost, with hourly rates typically ranging between $80 and $150. For a more accurate estimate, it's recommended to consult local auto repair shops.

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Code P1365 Information for Specific Makes

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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