OBD-II code · Powertrain (generic)
P030F Ignition B Control Signal Circuit High
Ignition B control signal stuck high — short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P030F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Ignition Coil
Related codes
- P030CIgnition A Control Signal Circuit High
- P031CIgnition C Control Signal Circuit High
- P031FIgnition D Control Signal Circuit High
- P035CIgnition E Control Signal Circuit High
- P035FIgnition F Control Signal Circuit High
- P036CIgnition G Control Signal Circuit High
- P036FIgnition H Control Signal Circuit High
- P038CIgnition I Control Signal Circuit High
- P038FIgnition J Control Signal Circuit High
- P03FCIgnition K Control Signal Circuit High
- P03FFIgnition L Control Signal Circuit High
- P030DIgnition B Control Signal Circuit/Open
- P030EIgnition B Control Signal Circuit Low
- P0310Cylinder 10 Misfire Detected
- P0311Cylinder 11 Misfire Detected
- P0312Cylinder 12 Misfire Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.