P0350
Ignition Coil Primary/Secondary Circuit/Open
Ignition system
Generic OBD-II
High
What it means
P0350 is a generic code meaning the ECM has found a fault (open or short) in an ignition coil's primary or secondary control circuit. The affected coil may not fire properly, so you'll typically get a misfire, rough running, and lost power — and on engines that depend on a single coil, hard starting or a no-start.
High
Can I keep driving? Depends — a dead coil usually means a misfire, and on engines that rely on one coil it can cause hard starting or a no-start; fix promptly to protect the converter.
Common symptoms
What you'll notice
- Check-engine light on
- Misfire and rough running
- Reduced power and hesitation
- Hard starting or stalling
Common causes
Most likely first
- Faulty ignition coilLikely
- Damaged or corroded coil wiring or connectorCommon
- Worn spark plug or plug wireCommon
- Failed coil driver in the ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Scan for cylinder-specific misfire codes to identify the affected coil.
- Inspect the coil connector and primary wiring for damage or corrosion.
- Measure coil primary and secondary resistance against spec.
- Swap the coil to another position and see if the fault follows it.
- Replace the faulty coil or plug; if wiring and coil are good, check the driver circuit/ECM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0350?+
A misfire can overheat the catalytic converter, so drive as little as possible until fixed; if the engine won't start, don't keep cranking it.
Can I just clear P0350?+
You can, but it returns until the coil circuit fault is repaired.
Related codes
Often seen with P0350
Read & clear P0350 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX