Ignition Coil F Primary Control Circuit Low
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.
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.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
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?+
Can I just clear P2315?+
Related codes
Read & clear P2315 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.