Skip to content
GTECH Calibration
Portal

P1362

Ignition Coil C 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
62
FaultThe specific fault in that area

What it means

On Mercury (Ford-group) vehicles, P1362 means the engine control unit has detected a fault in the secondary circuit of ignition coil C. The control unit monitors the ignition feedback from the coil and found that the secondary side was not behaving as expected, so it set the code. Which cylinder 'coil C' serves depends on the model and engine, so confirm this from the workshop data for the vehicle.

Symptoms

  • Engine misfire or rough running, especially at idle
  • Hesitation or loss of power under acceleration
  • Malfunction indicator lamp on, possibly flashing under load
  • Poor fuel economy
  • Hard starting or an extended cranking time
  • Fuel smell from the exhaust

Possible causes

  • Faulty ignition coil C (internal secondary winding fault)likely
  • Worn, fouled or incorrectly gapped spark plug on the cylinder served by coil Clikely
  • Damaged or corroded coil connector, terminals or wiring to coil Cpossible
  • Cracked or degraded coil boot or spark plug lead allowing high-tension leakagepossible
  • Low or unstable supply voltage or poor earth to the ignition systempossible
  • Fault in the engine control unit ignition driverrare

How to diagnose

  1. Read all stored and pending codes and the freeze frame data to see engine load, speed and temperature when the fault set, and check for other misfire codes.
  2. Identify which cylinder coil C serves on this model and engine using the workshop data.
  3. Inspect the coil connector, terminals and wiring for corrosion, looseness, heat damage or chafing.
  4. Inspect the coil, boot and any lead for cracks, carbon tracking or signs of arcing.
  5. Remove the spark plug for that cylinder and check its condition, type and gap against the specification.
  6. Swap coil C with a coil from another cylinder, clear the code and see whether the fault follows the coil.
  7. Check the coil supply voltage and earth with a multimeter, following the wiring diagram for the model.
  8. If the coil, plug and wiring all test good, test the control unit driver circuit as per the manufacturer's procedure.

How to fix

  • Replace the faulty ignition coil with a part of the correct specification.
  • Replace the spark plugs with the correct type, gapped to specification, ideally as a full set.
  • Repair or replace damaged wiring, terminals or the coil connector.
  • Replace a cracked coil boot or lead.
  • Restore the power supply or earth connection, including battery and charging system faults if found.
  • Replace or repair the control unit only after all other causes have been ruled out.

Can I keep driving?

Medium severity

Short, gentle journeys are possible, but get it fixed soon as a persistent misfire can overheat and damage the catalytic converter. If the warning lamp flashes, reduce load and stop driving as soon as it is safe to do so.

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

This code for other makes

Nearby codes