P2329Ignition Coil J Secondary Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2329 covers the secondary side of coil J, meaning the spark path to the plug of cylinder 10. No public manufacturer source assigns it. Ford, whose V10 is the obvious ten-cylinder candidate, lists coil J only on the primary side (P2327/P2328) and in its 2014 code list skips every secondary code of the series. FCA's insufficient-ionization codes stop after coil 8. The code therefore stays a reserved SAE slot; a weakening coil J or a carbon-tracked boot would in practice be caught by the misfire monitor as P0310, which CARB requires to identify the misfiring cylinder. Diagnosis would follow the usual sequence of swapping coil and plug with a neighbouring cylinder and watching whether the fault moves.
- What you may notice
- Check engine light on
- Misfire on cylinder 10 (P0310)
- Jerking under acceleration, worse when damp
- Likely causes
- LikelyEroded spark plug on cylinder 10
- PossibleCarbon tracking on the coil J boot
- PossibleCoil J high-voltage winding deteriorating
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €25 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.