Code
P2329
Generic
P — Powertrain
Ignition Coil J Secondary Circuit
Views:
UK: 16
EN: 27
RU: 21
AI status
Completed
Completed
100%
Causes
- Ignition coil J failure (internal short/open)
- Damaged/shorted high-voltage lead or spark plug wire (if applicable)
- Faulty spark plug (fouled, damaged, wrong gap)
- Corroded/loose coil connector or terminal
- Wiring harness short to ground or battery, or open circuit in secondary/coil circuit
- Moisture/oil contamination or carbon tracking on coil tower/boot
Symptoms
- Check engine light (MIL) illuminated
- Single-cylinder misfire or misfire detected on the cylinder served by coil J
- Rough idle, hesitation, or reduced power under load
- Poor fuel economy
- Possible increased emissions or failed emissions test
- Occasional or constant misfire codes depending on fault nature
What to check
- Read freeze frame and misfire counters to identify affected cylinder and conditions when code set
- Visual inspection of coil J, connector, ignition boot, and spark plug for damage, fouling, oil, or carbon tracking
- Inspect wiring harness for chafing, pin corrosion, loose terminals, or water ingress at the coil connector
- Swap coil J with a known-good coil from another cylinder and see if code/misfire follows the coil (only if safe and correct for vehicle design)
- Use an oscilloscope or secondary ignition tester to observe secondary spark waveform and confirm spark energy/consistency
- Measure primary and secondary resistance of the coil and compare with manufacturer specifications
Signal parameters
- ECM monitors secondary spark activity for Coil J (presence/absence of high-voltage pulses)
- Primary driver control (dwell/ground switching) from PCM during crank/run
- Typical primary resistance: consult factory spec (typical modern coils ~0.4–2 Ω)
- Typical secondary resistance: consult factory spec (typical modern coils ~5–20 kΩ)
- Secondary spark voltage waveform: high amplitude high-voltage pulses during ignition events (use oscilloscope)
Diagnostic algorithm
- Confirm code and record freeze frame/misfire data with a scan tool
- Perform a visual inspection of coil J, connector, spark plug and boot for contamination, damage, or oil intrusion; repair or replace as needed
- Swap coil J with a known-good coil from another cylinder; if the code/misfire moves with the coil, replace the coil
- If swapping doesn’t move the fault, inspect and test wiring: check connector continuity, pin condition, and look for shorts to ground or battery
- Measure coil primary and secondary resistances and compare to factory specifications; replace coil if out of spec or intermittent
- Use an oscilloscope or secondary ignition tester to verify secondary spark waveform and check for carbon tracking or weak spark
- If wiring and coil test good, verify PCM driver outputs and grounds with a lab scope or multi-meter (check reference voltage, driver switching, and ground integrity)
- After repairs, clear codes and perform a road test/engine run to confirm the fault does not return; monitor misfire counters and readiness monitors
Likely causes
- Failed coil pack/module for coil J
- Damaged coil-to-plug boot or spark plug causing poor secondary conduction
- Broken/shorted high-voltage lead or connector pin corrosion
- Intermittent wiring short to ground on coil J secondary path
- Carbon tracking or contamination on coil/boot surface
Fault status
Status
Ignition Coil J Secondary Circuit — high-voltage/spark output fault detected; possible open/short/weak spark at coil J
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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