Ignition Coil K Primary/Secondary Circuit Malfunction
Code P0361 indicates a malfunction in the ignition coil K (Coil On Plug) primary or secondary circuit, preventing proper spark generation at that cylinder. This causes the engine control module to detect a fault in the coil's electrical circuit, which may result in engine misfire and poor performance.
What You Might Notice
- Check Engine Light (MIL) illumination
- Engine misfire on cylinder K, especially under acceleration
- Rough idle or hesitation during driving
- Reduced fuel economy and power loss
- Intermittent misfiring that may come and go
Most Common Causes
- 1
Faulty Coil On Plug (COP)
The ignition coil itself has failed internally or has an open/shorted winding. This is the most common cause of P0361.
- 2
Loose or Corroded Coil Connector
Poor electrical connection at the coil connector due to corrosion, loose pins, or broken connector locks prevents proper signal transmission to the coil.
- 3
Wiring Short to Voltage or Ground
The primary or secondary circuit wiring is shorted to battery voltage or chassis ground, disrupting the coil driver signal from the PCM.
- 4
Faulty Powertrain Control Module (PCM)
The PCM coil driver circuit has failed, preventing it from sending the proper switching signal to ignition coil K.
How to Diagnose It
- 1
Check Faulty Coil On Plug (COP) — The ignition coil itself has failed internally or has an open/shorted winding. This is the most common cause of P0361.
- 2
Check Loose or Corroded Coil Connector — Poor electrical connection at the coil connector due to corrosion, loose pins, or broken connector locks prevents proper signal transmission to the coil.
- 3
Check Wiring Short to Voltage or Ground — The primary or secondary circuit wiring is shorted to battery voltage or chassis ground, disrupting the coil driver signal from the PCM.
- 4
Check Faulty Powertrain Control Module (PCM) — The PCM coil driver circuit has failed, preventing it from sending the proper switching signal to ignition coil K.
How to Fix It
- 1
Replace Ignition Coil K
Remove the spark plug wire or connector from coil K, unbolt the coil from the engine, and install a new OEM or quality replacement coil. Reconnect all connectors securely and clear the code to verify the fix.
- 2
Inspect and Repair Coil Connector
Check the connector at coil K for corrosion, loose pins, or damage. Clean contacts with electronics cleaner, repair or replace the connector as needed, and ensure the connection is tight.
- 3
Check and Repair COP Driver Wiring
Inspect the wiring harness from the PCM to coil K for cuts, pinches, or corrosion. Repair damaged insulation with electrical tape or replace the wiring harness if severely compromised.
- 4
Test and Replace PCM if Necessary
After ruling out coil and wiring issues, test the PCM's coil driver output with a scope. If the PCM is not producing a proper switching signal, the module may need replacement by a dealer or specialized shop.
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