P0354 – Ignition Coil D Primary/Secondary Circuit Malfunction

Meaning:

When there’s a short in the driver circuit for the engine’s coil #4, the P0354 happens
The P0354 is triggered when there’s a short in the driver circuit for the engine’s coil #4

There’s a short in the driver circuit for the engine’s coil #4 (the coil for cylinder #4).

Main Symptoms:

Possible Causes:

  • Short or open in the coil on plug (COP) driver circuit
  • Loose or broken connection at coil
  • Defective COP
  • Defective PCM (least likely)

Diagnostic Steps:

  • If the engine is not currently misfiring then it’s an intermittent problem. Start by checking coil #4 wires visually as well as using wiggle test
  • Check for loose connections and broken connector locks
  • If all the above check out replace coil #4

Read More: OBD2 Codes List: Meaning, Fixes, and Free Download