P2320

Code

Generic P — Powertrain

Ignition Coil G Secondary Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 38 RU: 24

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Read DTCs and freeze‑frame data; note related misfire counts and RPM/load when fault set
Visually inspect coil G, connector, wiring, spark plug and boot for damage, corrosion, moisture or oil contamination
Swap coil G with a known good coil (if identical) and see if code follows the coil
Check for related misfire codes (P03xx) to identify affected cylinder
Perform spark test or use a spark tester to verify high voltage at the plug (caution: high voltage present)
Measure coil primary and secondary resistance per service spec (compare to known good)

Secondary ignition event: high‑voltage spike (kV range) at each firing event — amplitude varies with engine conditions
Secondary pulse width/spike duration: short high‑voltage transient coinciding with primary discharge (milliseconds scale)
Primary coil current and dwell time vary with RPM/load — secondary spike should occur at each commanded fire
Misfire count increment or missing secondary spike on oscilloscope for the affected cylinder

Confirm and record DTCs, freeze frame and related misfire codes
Perform safe visual inspection of coil G, spark plug, boot and wiring for cracks, oil, carbon or water
With engine off, disconnect coil connector and inspect pins for corrosion, bent pins or poor crimps; repair as needed
Swap coil G with another identical coil to see if the fault follows the coil (if code follows, replace coil)
Measure coil primary and secondary resistance and compare to spec or known good coil
Use an ignition scope or HV probe to check for proper secondary spike and to detect arcing/carbon tracking while engine is cranking/running
If waveforms and coil tests are good, backprobe/monitor ECM/ignition driver outputs (primary control) to ensure correct command; check grounds and related fuses
If wiring to coil shows intermittent shorts/open, repair/replace harness and connectors, then clear codes and test drive
After repairs, clear codes and confirm no reoccurrence; if fault persists and wiring/coil are good, consider ECM/ignition module diagnosis by qualified technician