Ford Code P1365 – Ignition Coil Secondary Circuit Malfunction

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Ford P1365 Code Description

The Ford P1365 code indicates a malfunction in the ignition coil secondary circuit. The ignition coil is responsible for converting the battery’s low voltage into the high voltage needed to ignite the fuel in the engine cylinders. When the ignition coil secondary circuit fails, it can lead to misfires, rough idling, and poor engine performance. Ignoring this issue can result in further damage to engine components and reduced fuel efficiency.

Common Causes of Ford P1365 Code

NOTE: The listed causes may not be a complete list of all potential issues, and there may be other causes.

  1. Faulty ignition coil
  2. Damaged spark plug wires
  3. Corrosion or loose connections in the ignition coil circuit
  4. Electrical issues in the Engine Control Module (ECM)
  5. Excessive heat or vibrations damaging the ignition coil

Symptoms of Ford P1365

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Difficulty starting the engine
  5. Engine stalling

How to Fix Ford P1365 Code

  1. Diagnose the issue using a scan tool to check the Ford P1365 code.
  2. Inspect the ignition coil and spark plug wires for any signs of damage or wear.
  3. Test the ignition coil’s resistance and primary/secondary circuits to ensure proper operation.
  4. Replace the faulty ignition coil or spark plug wires if necessary.
  5. Clear the diagnostic codes and test the vehicle to ensure the problem is resolved.

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