Ignition

P0354 — Ignition Coil D Primary/Secondary Circuit Malfunction (Often Cylinder 4)

Severity: medium Drive with care, to a shop

What P0354 means

The engine control module monitors the electrical circuit of ignition coil D, which is usually the coil on cylinder 4. The module switches the coil's ground path on and off through a driver to create a spark. P0354 sets when the circuit signal is out of range, due to an open, a short, or a coil that is not working properly.

Symptoms

  • Check engine light on or flashing
  • Rough idle and engine shaking
  • Misfire on cylinder 4
  • Loss of power and sluggish acceleration
  • Hesitation when pressing the throttle
  • Worse fuel economy

Possible causes

  1. Failed ignition coil D
  2. Open or short in the coil control wiring
  3. Poor contact or corrosion at the coil connector
  4. Faulty coil driver inside the engine control module (less common)
  5. Worn or faulty spark plug
  6. Wiring harness damaged by heat or rubbing

How to diagnose

  1. Read codes and freeze frame data and check misfire counts by cylinder
  2. Inspect the coil D connector and harness for corrosion, melting and cracks
  3. Swap coil D with a neighboring coil and see if the fault follows the coil
  4. Inspect the spark plug in that cylinder for gap, wear, fouling and cracked insulator
  5. Measure power and ground at the coil connector with a multimeter
  6. Check the control signal from the module with a test light or scope
  7. Test the control wire for opens and shorts back to the module
  8. If wiring is good, evaluate the coil driver in the module

Common fixes

  • Replace ignition coil D
  • Replace spark plugs, ideally as a full set
  • Repair wiring or replace the connector
  • Replace or reprogram the engine control module if the driver has failed

P0354 on different brands

Ford · manuals
Ford uses an extended P0354:11 format (circuit short to ground) in its 2024-2025 monitoring strategy; it describes the detected circuit condition and does not by itself confirm a failed part.

Questions and answers

What does P0354 mean?

It is a fault in the primary or secondary circuit of ignition coil D, most often on cylinder 4. The computer sees an electrical problem that can cause a lost spark.

Can I drive with P0354?

Only briefly and under light load. Misfires can damage the catalytic converter, so stop if the check engine light is flashing.

Is replacing the coil always the fix?

Not always. Check the connector, wiring and spark plug first, or the new coil may fail again.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.