Powertrain, generic (extended)

P2329 Ignition Coil J Secondary Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Eroded spark plug on cylinder 10
Carbon tracking on the coil J boot
Coil J high-voltage winding deteriorating

Symptoms

  • Check engine light on
  • Misfire on cylinder 10 (P0310)
  • Jerking under acceleration, worse when damp

Repair estimate

DifficultyMediumDIY possible
Parts and labour€25–500
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ignition coilspark plug

Related codes

P2327P2328P2326P0360P0310

References: law.cornell.edu, performanceparts.ford.com, en.wikipedia.org.