OBD-II code · Powertrain (generic, extended)
P2C31 Ignition Coil Primary Circuit Fuse B
The ECM detects an open or blown fuse on the ignition coil primary supply circuit B. Affected coils receive no operating voltage.
Is it safe to drive with P2C31?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPrimary supply fuse blown by short circuit
- PossibleShorted ignition coil drawing excess current
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.2–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Ignition Coil Fuse B, Ignition Coils, Wiring Harness
Related codes
- P2C30Ignition Coil Primary Circuit Fuse A
- P2C2ETurbocharger/Supercharger Bypass Valve B Supply Voltage Low
- P2C2FTurbocharger/Supercharger Bypass Valve B Driver Current/Temperature Too High
- P2C32Crankcase Pressure Sensor B Circuit
- P2C33Crankcase Pressure Sensor B Circuit Range/Performance
- P2C34Crankcase Pressure Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.