P2308 code meaning
Ignition Coil C Secondary Circuit
Powertrain system Generic code P23xx codes Check engine light
What P2308 means
P2308 points at the high-voltage path of coil C, normally cylinder 3: winding, trunk and plug. The code is uncommon. FCA's 3.6 V6 in the 2015–2016 Caravan and Town & Country calls it coil 3 secondary circuit with insufficient ionization. For vans built from late July to mid September 2015 FCA bulletin 18-069-16 swapped the PCM and flashed current software, keeping the battery between 13.2 and 13.5 V on a charger during the flash; the labour allowance is half an hour. Ford and GM tables list no secondary-circuit code for coil C at all; there a weak spark only becomes visible as misfire (P0303). Because each misfire sends unburned fuel into the exhaust, CARB requires the MIL to flash once misfire rates threaten the catalyst. Check plug and trunk before suspecting the module.
P2308 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 P2308
- Check engine light on
- Misfire on cylinder 3 with P0303 stored
- Engine runs rough
Common causes of P2308
- Most likelySpark plug of cylinder 3 worn or fouled
- PossibleBoot of coil C leaking high voltage
- PossibleFCA vans built 27 July–11 September 2015: PCM fault (bulletin 18-069-16)
- Less likelyCoil C secondary winding faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition coilSpark plug
What each part of P2308 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. |
| 08 | The exact fault in that area. |
What to do next
- Note P2308 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 P2308
What does P2308 mean?
P2308 means "Ignition Coil C Secondary Circuit". P2308 points at the high-voltage path of coil C, normally cylinder 3: winding, trunk and plug. It is a generic code, so it means the same on every make.
Is it safe to drive with P2308?
Drive gently and only to a workshop. With P2308 the car can go into limp mode (reduced power) to protect itself.
Will P2308 fail an emissions test?
Yes, it can. P2308 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 P2308 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 P2308 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.