P2C31 code meaning
Ignition Coil Primary Circuit Fuse B
Powertrain system Generic code P2Cxx codes Check engine light
What P2C31 means
P2C31 is the second of two fuse checks in the coil primary supply: the fuse B group of coils has lost voltage, or the module believes so. GM's patent on this monitor counts how often the current through the fuse falls below a threshold within a set number of samples before it declares the fuse open, then flags a service warning and stops fuel to the unfired cylinders. Stellantis lists P2C31 together with P2C30 for the 3.0L Hurricane I6 in the 2025 Ram 1500 and the 2023–2024 Wagoneer/Grand Wagoneer; later bulletins such as 08-136-26 and 08-194-26 add misfire codes P0300–P0306 and catalyst codes P0420/P0430, and the fix remains a reflash of the ignition system control module, partly with the PCM. A truly blown fuse usually means a shorted coil or chafed feed.
P2C31 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.2 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2C31
- Check engine light
- Engine misfires or hesitates
- Catalyst codes may follow
Common causes of P2C31
- Most likelyIgnition system control module calibration (Stellantis 3.0L Hurricane)
- PossibleShorted ignition coil in group B blowing the fuse
- Less likelyChafed coil feed wire shorting to ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition coil fuse bIgnition coilsWiring harness
What each part of P2C31 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| 31 | The exact fault in that area. |
What to do next
- Note P2C31 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 P2C31
What does P2C31 mean?
P2C31 means "Ignition Coil Primary Circuit Fuse B". P2C31 is the second of two fuse checks in the coil primary supply: the fuse B group of coils has lost voltage, or the module believes so. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C31?
Drive gently and only to a workshop. With P2C31 the car can go into limp mode (reduced power) to protect itself.
Will P2C31 fail an emissions test?
Yes, it can. P2C31 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 P2C31 to fix?
Difficulty: medium. A typical repair takes 0.2 to 1.5 hours of work. This is a job for a workshop.
Will P2C31 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.