DTC codes / P23xx · Ignition system and misfire / P23CF
P23CF means the fuel heater control module is reporting a feedback signal voltage that is lower than the expected range, so the powertrain control module cannot confirm the heater is being commanded correctly. The computer detects this by monitoring the feedback circuit and seeing a voltage that stays below the calibrated threshold for the fault to set.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.