Ignition Coil I Primary/Secondary Circuit Malfunction
Your engine's ignition coil for cylinder I isn't communicating properly with the engine computer. Think of it like a spark plug's power supply being weak or broken, preventing the fuel from igniting correctly.
The ECU monitors the primary and secondary circuits of the ignition coil by checking voltage levels, coil charging time, and spark timing feedback. It detects open circuits, shorts, or excessive resistance that prevent proper coil operation. If voltage or current measurements fall outside normal operating ranges, the fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Coil Primary Voltage | 11-14V during cranking/running | Below 9V or above 16V, or no voltage change |
| Coil Dwell Time | 3-8 milliseconds at idle | Outside range or inconsistent switching |
Code P0360 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0360 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.