What does code P23DF mean?

Q: What does code P23DF mean?

Cylinder 4 Fuel Heater Control Circuit Low. P23DF indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the fuel heater built into cylinder 4's fuel injector. The heater is designed to warm the fuel for better cold-start performance and combustion efficiency, and a low circuit reading means the PCM sees less voltage than expected, often due to a short to ground or a failed heater element.

DTC codes / P23xx · Ignition system and misfire / P23DF

P23DFCylinder 4 Fuel Heater Control Circuit Low

P23DF indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the fuel heater built into cylinder 4's fuel injector. The heater is designed to warm the fuel for better cold-start performance and combustion efficiency, and a low circuit reading means the PCM sees less voltage than expected, often due to a short to ground or a failed heater element.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

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.