Ignition Coil "F" Primary Control Circuit High
P2316 indicates the primary control circuit for Ignition Coil F is reading higher than expected voltage. This code sets when the PCM detects an abnormal electrical signal in the ignition coil driver circuit, preventing proper spark generation for that cylinder.
What You Might Notice
- Engine misfire or misfiring on cylinder 6
- Diminished engine performance and power loss
- Reduced fuel efficiency
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
Most Common Causes
- 1
Faulty Ignition Coil F
The ignition coil pack for cylinder 6 may have an internal short or winding failure causing high resistance in the primary circuit.
- 2
Wiring or Connector Issues
Damaged, corroded, or loose wiring harness connections to the ignition coil primary circuit can cause high voltage readings and signal loss.
- 3
PCM Driver Circuit Malfunction
The ignition coil driver transistor inside the PCM may be failing, unable to properly control current flow through the primary coil circuit.
- 4
High Resistance in Primary Circuit
Carbon deposits, corrosion, or damaged spark plug wires in the ignition circuit can create excessive resistance and trigger the high voltage fault.
How to Diagnose It
- 1
Check Faulty Ignition Coil F — The ignition coil pack for cylinder 6 may have an internal short or winding failure causing high resistance in the primary circuit.
- 2
Check Wiring or Connector Issues — Damaged, corroded, or loose wiring harness connections to the ignition coil primary circuit can cause high voltage readings and signal loss.
- 3
Check PCM Driver Circuit Malfunction — The ignition coil driver transistor inside the PCM may be failing, unable to properly control current flow through the primary coil circuit.
- 4
Check High Resistance in Primary Circuit — Carbon deposits, corrosion, or damaged spark plug wires in the ignition circuit can create excessive resistance and trigger the high voltage fault.
How to Fix It
- 1
Inspect and replace ignition coil F
Test the ignition coil pack for cylinder 6 with a multimeter to verify proper resistance values. Replace the coil if resistance readings are out of specification or if the coil is visibly damaged or oil-soaked.
- 2
Check wiring harness and connectors
Inspect all wiring connected to ignition coil F for cuts, corrosion, or loose connections. Clean corroded connectors with electrical contact cleaner and reseat connections firmly. Replace any damaged wiring segments.
- 3
Test PCM and coil driver circuit
Use an oscilloscope to monitor the primary control signal from the PCM to coil F. If the signal is abnormal or absent, the PCM may require reprogramming or replacement.
- 4
Replace spark plug and wires if needed
Inspect the spark plug for cylinder 6 and its connecting wires for excessive wear, carbon fouling, or damage. Replace if necessary to restore proper ignition system function.
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