P0357
Ignition Coil G Primary Control Circuit/Open
Ignition system
Generic OBD-II
High
What it means
P0357 means the ECM detected an open or faulty primary control circuit for ignition coil 'G' (the seventh coil). That coil fires its cylinder's spark plug, so an open circuit — from a failed coil, broken wiring, or a bad connector — leaves that cylinder misfiring, causing rough running and reduced power.
High
Can I keep driving? Driveable but the affected cylinder misfires; a sustained misfire can overheat and damage the catalytic converter, so fix it soon.
Common symptoms
What you'll notice
- Check-engine light on (may flash during an active misfire)
- Misfire and rough idle
- Reduced power and hesitation on acceleration
- Possible hard starting
Common causes
Most likely first
- Failed ignition coil 'G'Likely
- Open or shorted primary-control wiring to the coilCommon
- Poor connection or corrosion at the coil connectorCommon
- Fault in the coil driver within the ECM/PCMLess often
- Failed ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for a matching cylinder misfire code (e.g. P0307).
- Inspect coil 'G' connector and wiring for open circuits, damage, or corrosion.
- Swap the suspect coil with a known-good one and see if the fault follows the coil.
- Check the primary control circuit for continuity back to the ECM/PCM driver.
- Replace the coil if it has failed. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0357?+
Only briefly. A dead coil means one cylinder isn't firing, dumping raw fuel into the exhaust and risking catalytic converter damage — especially if the light is flashing.
Can I just clear P0357?+
It returns quickly while the coil circuit is open. Repair the coil or wiring first, then clear and re-test.
Related codes
Often seen with P0357
Read & clear P0357 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