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P1360

Ignition Coil A Secondary Circuit Malfunction.

  • Mercury
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
3
AreaIgnition system or misfire
60
FaultThe specific fault in that area

What it means

On a Mercury, P1360 means Ignition Coil A Secondary Circuit Malfunction. The engine control unit monitors the ignition coil's secondary circuit, usually through the primary-side feedback or ion-sensing signal, and sets the code when the expected spark or coil signature is missing or out of range. It is often accompanied by misfire codes, and the exact coil layout depends on the model and engine.

Symptoms

  • Engine misfire or rough running, especially at idle
  • Hesitation or loss of power under acceleration
  • Hard starting or extended cranking
  • Flashing or steady engine warning light
  • Poor fuel economy
  • Occasional stalling

Possible causes

  • Worn or failing ignition coil (coil A) with weak or no secondary outputlikely
  • Worn, fouled or incorrectly gapped spark plug on the cylinder served by coil Alikely
  • Damaged or perished coil boot, spark plug lead or high-tension connection causing arcing or leakagepossible
  • Loose, corroded or damaged connector or wiring to the coil, including poor power or earth feedpossible
  • Fault in the coil driver circuit within the engine control unitrare
  • Moisture ingress in the plug well or coil arearare

How to diagnose

  1. Read all stored and pending codes and note any misfire codes (P0300 series) alongside P1360
  2. Review freeze frame data for engine speed, load and temperature when the fault set, and check whether it happens cold, hot or under load
  3. Visually inspect the coil, boot, leads and connector for cracks, carbon tracking, burn marks, oil, water or corrosion
  4. Check the coil connector pins and wiring for damage, tightness and condition, and test the power and earth supply to the coil
  5. Remove the spark plug for the affected cylinder and check its condition and gap against the manufacturer's specification
  6. Swap coil A with another cylinder's coil, clear the codes and see whether the fault or misfire follows the coil
  7. Test coil primary and secondary resistance against the manufacturer's figures for your engine, as values vary by model
  8. If the coil, plug and wiring are all sound, check for a related ECU software update and have the control unit driver circuit tested

How to fix

  • Replace the faulty ignition coil, fitting a matching part for your engine
  • Replace worn or fouled spark plugs, set to the correct gap, ideally as a full set
  • Replace damaged coil boots, leads or connectors
  • Repair or replace damaged wiring, terminals or earth connections found in the coil circuit
  • Dry out and clean the plug well and fix any source of water or oil leakage
  • Repair or replace the engine control unit only after all other causes are ruled out

Can I keep driving?

Medium severity

The car can usually be driven short distances to get it checked, but avoid heavy loads and long trips. If the warning light is flashing or the engine is misfiring badly, stop driving as unburnt fuel can overheat and damage the catalytic converter.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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