P1389 – Ignition Coil Internal Short Detected
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
- Rough idle
- Engine shaking
Causes
- Coil insulation failure
- Overheating
- Manufacturing defect
Diagnosis
- Test coil resistance
- Inspect wiring
- Scan ECU
Repair
- Replace coil
- Repair wiring if damaged