P2305 code meaning
Ignition Coil B Secondary Circuit
Powertrain system Generic code P23xx codes Check engine light
What P2305 means
P2305 is about coil B's output side: the secondary winding, the connection to the plug and the spark plug of cylinder 2. Where a maker uses it, the module does not just watch whether the coil was switched, but whether a usable spark happened. Ion sensing is one way: as with Saab's Direct Ignition, a low voltage is applied across the plug outside the firing moment, and the resulting ion current tells the module whether the mixture burned – it can even replace the knock sensor. FCA names P2305 coil 2 secondary circuit with insufficient ionization on 2015–2016 Caravan and Town & Country 3.6 V6 and listed it with P0300–P0306 when misfire, rough running and the MIL called for a new PCM. Unlike P2303/P2304, a clean control line does not rule this code out; spark plugs and boots come first.
P2305 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2305
- Check engine light on
- Misfire on cylinder 2, sometimes only under load
- Rough running, raised fuel consumption
Common causes of P2305
- Most likelySpark plug of cylinder 2 worn, oily or with the wrong gap
- PossibleCoil B trunk cracked or damp, spark leaking away
- PossibleCoil B secondary winding weak
- Less likelyFaulty ion-current evaluation in the PCM
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition coilSpark plugSpark plug wire
What each part of P2305 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 05 | The exact fault in that area. |
What to do next
- Note P2305 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2305
What does P2305 mean?
P2305 means "Ignition Coil B Secondary Circuit". P2305 is about coil B's output side: the secondary winding, the connection to the plug and the spark plug of cylinder 2. It is a generic code, so it means the same on every make.
Is it safe to drive with P2305?
Drive gently and only to a workshop. With P2305 the car can go into limp mode (reduced power) to protect itself.
Will P2305 fail an emissions test?
Yes, it can. P2305 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2305 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2305 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.