P2315
Ignition Coil F Primary Control Circuit Low
Ignition / misfire
Generic OBD-II
Medium
What it means
P2315 means the ECM detected low voltage in the primary control circuit of ignition coil 'F'. That cylinder may not fire, producing a misfire, rough running, and reduced power. The usual causes are a failed coil, a control wire shorted to ground or open, or a bad connector.
Medium
Can I keep driving? Drivable, but the affected cylinder may misfire — sustained misfiring can overheat the catalytic converter, so avoid extended or hard driving until fixed.
Common symptoms
What you'll notice
- Check-engine light on (may flash during an active misfire)
- Rough idle or hesitation
- Misfire on one cylinder
- Reduced power on acceleration
Common causes
Most likely first
- Faulty ignition coil 'F' (primary winding)Likely
- Coil control wire shorted to ground or openCommon
- Corroded or loose coil connectorCommon
- ECM/PCM coil driver faultLess often
- Poor coil ground or supply voltageLess often
How to diagnose & fix
Work through it in order
- Identify which physical cylinder maps to coil 'F' for your engine.
- Inspect the coil connector and primary control wiring for shorts or opens.
- Check the coil's supply voltage and ground.
- Swap the suspect coil with a known-good one and see if the code follows it.
- Replace the faulty coil if the wiring is good, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2315?+
Short trips are okay, but a dead cylinder sends raw fuel into the exhaust and can damage the converter. Repair it soon.
Can I just clear P2315?+
It comes back once the primary circuit faults again. Fix the coil or its wiring first.
Related codes
Often seen with P2315
Read & clear P2315 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