Powertrain, generic (extended)

P2C31 Ignition Coil Primary Circuit Fuse B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Ignition system control module calibration (Stellantis 3.0L Hurricane)
Shorted ignition coil in group B blowing the fuse
Chafed coil feed wire shorting to ground

Symptoms

  • Check engine light
  • Engine misfires or hesitates
  • Catalyst codes may follow

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–400
Time0.2–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ignition coil fuse bignition coilswiring harness

Related codes

P2C30P0300P0354P0350P0430

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.