Ignition

P0361 — Ignition Coil K Primary/Secondary Circuit Malfunction

Severity: medium Drive with care, to a shop

What P0361 means

The engine control unit fires ignition coil K through a driver circuit and monitors that circuit's current and voltage. P0361 is stored when the signal doesn't match what's expected, such as an open circuit, a short to ground or power, or a coil that fails to produce a proper pulse. The result can be a weak or missing spark in that cylinder.

Symptoms

  • Check Engine light on, flashing if the misfire is severe
  • Rough idle
  • Loss of power and sluggish acceleration
  • Hesitation or jerking under load
  • Intermittent stalling
  • Higher fuel consumption

Possible causes

  1. Failed ignition coil K (internal winding fault)
  2. Damaged wiring: open, chafed insulation or short
  3. Corroded or loose coil connector
  4. Poor ground or unstable power supply to the coil
  5. Faulty coil driver inside the engine control unit (uncommon)
  6. Worn spark plug overloading the coil

How to diagnose

  1. Read all codes and freeze-frame data, and use the wiring diagram to find which cylinder coil K serves on this vehicle
  2. Inspect the coil connector and harness for heat damage, corrosion, chafing and a loose fit
  3. Inspect the spark plug in that cylinder for wear, gap, fouling or a cracked insulator
  4. Swap coil K with a known good coil and see whether the fault follows it
  5. Measure power and ground at the coil connector with the ignition on
  6. Check the control signal from the ECU (test light or scope) and the wire's continuity back to the ECU
  7. If the coil and wiring are good, test the ECU and its driver

Common fixes

  • Replace ignition coil K, and the spark plug if worn
  • Repair the damaged wiring or replace the connector
  • Clean the terminals and restore the ground and power supply
  • Replace or reprogram the ECU if the driver is confirmed faulty

Questions and answers

What does P0361 mean?

The engine computer detected a fault in the ignition coil K circuit, such as an open, a short or a wrong signal. The coil itself or its wiring is the most common cause.

Can I drive with P0361?

Only a short distance and without heavy load. If the Check Engine light is flashing, stop driving, since misfires can damage the catalytic converter.

How do I tell if it's the coil or the wiring?

Swap coil K with a good one. If the code moves to another cylinder, the coil is bad. If it stays, look at the wiring, connector or ECU.

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.