P1390 – Ignition Coil Internal Open Circuit
Want to confirm the real cause of this fault code?
A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.
Symptoms
- Misfire
- No spark
- Engine shaking
Causes
- Broken coil winding
- Connector failure
- Internal damage
Diagnosis
- Check coil continuity
- Inspect connector
- Test coil output
Repair
- Replace coil
- Repair connector