What does code P03FB mean?

Q: What does code P03FB mean?

Ignition K Control Signal Circuit Low. P03FB indicates that the powertrain control module (PCM) has detected a low voltage condition on the ignition control circuit for a specific cylinder or ignition coil, often referred to as 'K' in the manufacturer's naming. The PCM commands a ground or voltage signal to fire the coil, and the feedback circuit reports that the signal is below the expected threshold, meaning the coil may not be firing or the circuit has a short to ground or open.

DTC codes / P03xx · Ignition system and misfire / P03FB

P03FBIgnition K Control Signal Circuit Low

P03FB indicates that the powertrain control module (PCM) has detected a low voltage condition on the ignition control circuit for a specific cylinder or ignition coil, often referred to as 'K' in the manufacturer's naming. The PCM commands a ground or voltage signal to fire the coil, and the feedback circuit reports that the signal is below the expected threshold, meaning the coil may not be firing or the circuit has a short to ground or open.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.