What does code P23CD mean?

Q: What does code P23CD mean?

Fuel Heater Control Module Feedback Signal Open. P23CD means the fuel heater control module is reporting an open circuit on its feedback signal wire, so the powertrain control module (PCM) cannot confirm the heater is actually working. The PCM expects a voltage return on the feedback circuit whenever it commands the heater on, and it sets this code when that return is missing or out of range.

DTC codes / P23xx · Ignition system and misfire / P23CD

P23CDFuel Heater Control Module Feedback Signal Open

P23CD means the fuel heater control module is reporting an open circuit on its feedback signal wire, so the powertrain control module (PCM) cannot confirm the heater is actually working. The PCM expects a voltage return on the feedback circuit whenever it commands the heater on, and it sets this code when that return is missing or out of range.

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.