P2311Ignition Coil D Secondary Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2311 concerns the secondary side of coil D, usually cylinder 4. The secondary winding has thousands of turns of fine wire and delivers roughly 15–40 kV, so insulation that is merely tired can let the spark escape to ground instead of crossing the plug gap. Few control units watch this side as a circuit of its own; FCA's 3.6 Pentastar V6 does, naming P2311 coil 4 secondary circuit with insufficient ionization in bulletin 18-069-16 (2015–2016 Caravan and Town & Country, fixed by a new PCM). Most other makers leave such faults to misfire detection, so P0304 is the more frequent companion. Because misfire can overheat the catalyst, CARB lets misfire be evaluated in blocks of 200 revolutions and demands a flashing MIL at damaging rates.
- What you may notice
- Check engine light on
- Misfire on cylinder 4, worse in damp weather or under load
- Flashing MIL at heavy misfire
- Likely causes
- LikelyAged insulation in coil D or its boot letting the spark leak to ground
- LikelySpark plug of cylinder 4 worn, gap grown
- PossibleOil in the plug well softening the boot
- RarePCM ion-sense fault (FCA bulletin 18-069-16)
- 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: €30 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.