Code
P2317
Generic
P — Powertrain
Ignition Coil F Secondary Circuit
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil F)
- Worn or fouled spark plug for that cylinder
- Damaged spark plug wire, boot, or coil-on-plug boot
- Short, open, or poor connection in the secondary ignition circuit
- Carbon tracking or arcing on coil/boot
- Moisture/contamination causing leakage
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration
- Engine hesitation, stumbling, or loss of power
- Reduced fuel economy and increased emissions
- Possible misfire detected on the affected cylinder
- Hard starting or stumble under load in some cases
What to check
- Read and record freeze-frame and live data; note misfire counts and conditions
- Visually inspect coil F, boot, spark plug, and surrounding area for damage, contamination, or oil
- Swap coil F with another known-good coil and see if the fault/misfire follows the coil
- Check spark plug condition and gap; replace plug if fouled or worn
- Inspect connectors and harness for corrosion, bent terminals, or loose pins
- Use an ignition scope or secondary probe to verify spark waveform and secondary voltage
Signal parameters
- Primary coil resistance: consult factory specification (typical range for many coils ~0.2–2 Ω; varies by design)
- Secondary coil resistance: consult factory specification (typical range varies widely, often hundreds to thousands of ohms)
- Secondary spark peak voltage: varies with gap/compression, typically from a few kV up to 30–40 kV depending on conditions
- Ignition waveform: secondary waveform should show consistent spark events without excessive scatter or multiple re-ignitions
- Misfire/minute or cylinder-specific misfire counters from PCM live data
Diagnostic algorithm
- Retrieve freeze-frame and live data; verify P2317 and note operating conditions when fault set.
- Visually inspect coil F, boot, plug, and wiring for damage, contamination, oil, or cracks.
- Swap coil F with another cylinder's coil. If the fault or misfire moves to the other cylinder, the coil is likely faulty.
- Replace or inspect the spark plug and boot for the affected cylinder. Check and set proper spark plug gap.
- Measure coil primary and secondary resistance and compare to factory specifications. Replace coil if out of range.
- Use an ignition scope or secondary probe to inspect the spark waveform and secondary voltage while cranking or idling; look for weak, inconsistent, or absent spark.
- Inspect and test wiring and connector continuity between coil and engine harness; check for shorts to ground or open circuits.
- Check for signs of arcing/carbon tracking on boots, plug wells, or coil towers. Clean or replace components as needed.
- If wiring and components are good and issue persists, consider testing the ignition driver circuit in the PCM/ignition module per factory diagnostic procedure or consult a wiring/ECM specialist.
- Clear codes and road-test after repairs to confirm the fault does not return.
Likely causes
- Failed ignition coil for cylinder F
- Damaged or degraded spark plug or boot
- Loose or corroded connector at coil or spark plug
- Secondary arcing due to oil/contamination or cracked boot
- Wiring short to ground or open in coil secondary path
Fault status
Status
Ignition Coil F Secondary Circuit fault detected (P2317). Indicates abnormality in spark delivery path for coil F; inspect coil, plug, boot, wiring, and ignition module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours (may increase if wiring/ECM testing required)
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