P1360

Ford

Ignition Coil A Secondary Circuit Malfunction

Definition source: Manufacturer reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The ignition coil produces high voltage for the spark plugs. This code indicates a detected problem associated with Coil A's secondary ignition circuit, which carries that spark voltage. It may cause a misfire, rough running, or reduced power, but the code alone does not prove the coil itself has failed. Exact system design and diagnostic procedures depend on the vehicle's model, year, and engine.

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⚠️ Before You Begin (Safety First)

If the engine is shaking badly, losing power, or the check-engine light is flashing, stop driving when safe and arrange diagnosis; a severe misfire can damage the catalytic converter. Avoid touching ignition leads or coil outputs while the engine is running because ignition voltage can cause injury.

Common Symptoms

  • The check-engine light may be on, with or without noticeable drivability symptoms.
  • A misfire may cause rough idle, shaking, or uneven engine operation.
  • A weak or missing spark may cause hesitation or reduced power during acceleration.
  • Starting may be difficult if the affected ignition circuit prevents reliable spark.
  • There may be no obvious symptoms if the fault is intermittent or not affecting engine operation noticeably.

Common Causes

  • A fault within the ignition coil or coil assembly affecting its secondary output.
  • A worn, fouled, damaged, or incorrectly fitted spark plug.
  • A damaged or poorly connected ignition lead or other secondary-path component, if fitted on that vehicle.
  • Loose, corroded, or damaged coil wiring or connectors.
  • An intermittent electrical connection or another fault in the ignition system that produces abnormal secondary-circuit behavior.

Diagnostic Steps

  1. Record the code and any related codes before clearing anything; related misfire information can help identify whether the fault is isolated or part of a broader problem.
  2. With the engine off and cool, visually check the coil and accessible connectors or ignition leads for looseness, cracked insulation, corrosion, or obvious damage.
  3. If the vehicle's service information identifies an accessible spark plug or lead for Coil A, inspect it for visible damage or wear; confirm the correct components and procedure for the exact engine.
  4. Do not disconnect or handle ignition leads or coil outputs while the engine is running, and do not guess at wire locations or terminal tests.
  5. If visual checks do not reveal the cause, have the secondary circuit and coil tested with the correct vehicle-specific service information and equipment.

When to Call a Professional

Confirm the code and check for related misfire or ignition codes before replacing parts. Use the vehicle-specific wiring diagram and service information to inspect the Coil A secondary path, including the coil, spark plug, and any applicable ignition lead. Test coil operation and circuit integrity using appropriate equipment and procedures; do not assume the coil is faulty from this code alone.

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Commonly Asked Questions

Does P1360 mean the ignition coil must be replaced?

No. It identifies a problem associated with the Coil A secondary circuit, not a confirmed failed part. The coil, spark plug, applicable ignition lead, wiring, or connections may need checking.

Can the vehicle still be driven?

That depends on how the engine is running. If it runs smoothly and the warning light is steady, arrange diagnosis promptly. Stop when safe if the light flashes, the engine shakes badly, or power drops sharply.

What does the secondary circuit do?

It carries the high voltage produced by the ignition coil toward the spark plug so the plug can ignite the air-fuel mixture. The layout varies by engine.

Can this code appear without obvious symptoms?

Yes. An intermittent or limited fault may not cause noticeable drivability problems, so the code and any stored operating data still need proper diagnosis.

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