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P1352

Ignition Coil A Primary Circuit Fault.

  • Mercury
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
3
AreaIgnition system or misfire
52
FaultThe specific fault in that area

What it means

P1352 on a Mercury means the engine control unit has detected a fault in the primary circuit of ignition coil A. The control unit monitors the coil driver signal or the ignition feedback and saw it was missing, out of range or not behaving as commanded. Which cylinder coil A serves depends on the model and engine, so check the workshop data for the exact vehicle.

Symptoms

  • Engine misfire, especially under load
  • Rough idle or hesitation on acceleration
  • Hard starting or extended cranking
  • Engine management light on, possibly flashing during a misfire
  • Reduced power and poorer fuel economy
  • Engine stalling in some cases

Possible causes

  • Failed ignition coil A (internal primary winding open or shorted)likely
  • Damaged, chafed or corroded wiring to the coil primary circuit (open circuit, short to earth or short to power)likely
  • Poor connection at the coil connector, such as loose, corroded or spread terminalslikely
  • Missing or poor power supply or earth to the coil, such as a fault in the ignition feed circuit or fusepossible
  • Worn or incorrectly gapped spark plug causing excessive coil load and stresspossible
  • Faulty ignition module or coil driver in the engine control unitrare

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data (engine load, speed, temperature) to see when the fault occurs.
  2. Check for other misfire or ignition codes that point to a shared circuit or a specific cylinder.
  3. Visually inspect the coil A connector and wiring for damage, heat, chafing, corrosion or water ingress.
  4. Check the ignition fuse and confirm the coil has a good power supply and earth with the ignition on.
  5. Swap coil A with another cylinder's coil (if the design allows) and see whether the fault or misfire follows the coil.
  6. Measure the coil primary resistance and compare it with the manufacturer's specification for that engine.
  7. Inspect the spark plug for wear, fouling or incorrect gap and replace it if it is out of specification.
  8. Check the coil driver signal with an oscilloscope or suitable test equipment, and check the wiring continuity back to the control unit.

How to fix

  • Replace the faulty ignition coil A.
  • Repair or replace damaged wiring and renew any corroded or loose connector terminals.
  • Restore the power supply or earth to the coil, including replacing a blown fuse once the cause is found.
  • Fit new spark plugs of the correct type and gap if they are worn or fouled.
  • Where all wiring and the coil test good, have the engine control unit checked and repaired or replaced as per the manufacturer's procedure.

Can I keep driving?

Medium severity

The car can usually be driven short distances, but a misfire can overheat and damage the catalytic converter, so get it fixed soon. If the engine management light is flashing, reduce load and stop driving as soon as it is safe.

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

This code for other makes

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