P1362

Ford

Ignition Coil C 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 engine computer has detected a problem associated with the secondary side of ignition coil C, which delivers high voltage to produce a spark. The fault may cause a misfire or poor running, but the code alone does not prove the coil needs replacement. The exact circuit layout and diagnostic procedure depend on the vehicle's model, year and engine.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the engine is shaking badly, losing power, or the check-engine light is flashing, stop driving when it is safe to do so. An active misfire can overheat and damage the catalytic converter. Do not handle ignition components with the engine running; ignition voltage can cause a shock.

Common Symptoms

  • The engine may misfire or run unevenly if the ignition spark is weak or absent.
  • Rough idle, hesitation or reduced power may occur, especially when the affected ignition circuit is needed for engine operation.
  • Starting may be difficult if the fault significantly disrupts ignition.
  • The check-engine light may be on; it may flash if a misfire is severe enough to require immediate attention.
  • There may be no noticeable symptoms if the fault is intermittent or has not yet affected how the engine runs.

Common Causes

  • Ignition coil C may have an internal secondary-circuit fault.
  • A worn, damaged or fouled spark plug, or a fault in another secondary ignition component, may interfere with spark delivery.
  • A loose, damaged or corroded coil connector or wiring may interrupt the circuit.
  • A fault elsewhere in the ignition system may produce the detected condition; the code alone does not identify the failed part.

Diagnostic Steps

  1. Record the code and any related codes before clearing anything; related information can help identify whether the issue is isolated or part of a broader engine problem.
  2. With the engine off and cool, visually check accessible coil connectors and wiring for looseness, damage or corrosion. Do not pull on wires or handle ignition components while the engine is running.
  3. If a spark plug or other secondary component is accessible, check for visible damage or contamination using the vehicle-specific procedure. Do not assume a visual check rules out an electrical fault.
  4. If the code returns or the engine runs poorly, have the circuit tested using service information for the exact model, year and engine rather than replacing the coil based on the code alone.

When to Call a Professional

Confirm the code and check for related codes and misfire data before replacing parts. Inspect the coil's connections and secondary ignition components, then use the vehicle-specific service procedure to test the circuit and distinguish a coil problem from a plug, connection or wiring fault.

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Commonly Asked Questions

Does P1362 prove ignition coil C has failed?

No. It identifies a detected problem associated with coil C's secondary circuit. A coil, spark plug, connector, wiring fault or another ignition-system issue may be involved.

Does this code identify a particular cylinder?

The definition identifies coil C, not a cylinder. The relationship between coil labels and engine cylinders depends on the vehicle's model, year and engine.

Can I keep driving with this code?

If the engine runs normally, arrange diagnosis promptly and monitor for worsening symptoms. Stop when safe if the check-engine light flashes, the engine shakes severely or power drops; continued misfiring can damage the catalytic converter.

What should be checked before replacing a coil?

Check for related codes and misfire data, then inspect the coil connection, wiring and secondary ignition components. Vehicle-specific testing is needed to separate a coil fault from other causes.

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