P2C31Ignition Coil Primary Circuit Fuse B
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light
- Engine misfires or hesitates
- Catalyst codes may follow
- Likely causes
- LikelyIgnition system control module calibration (Stellantis 3.0L Hurricane)
- PossibleShorted ignition coil in group B blowing the fuse
- RareChafed coil feed wire shorting to ground
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €20 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.