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DTC codes / P23xx · Ignition system and misfire / P23CF

P23CFFuel Heater Control Module Feedback Signal Circuit Low

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.

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.

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