What does code P23D9 mean?

Q: What does code P23D9 mean?

Cylinder 3 Fuel Heater Control Circuit Open. P23D9 indicates that the powertrain control module (PCM) has detected an open circuit in the fuel heater control circuit for cylinder 3. The fuel heater, used in some diesel engines to warm the fuel for better cold-weather operation, is not receiving the expected voltage or current, so the PCM sets this code.

DTC codes / P23xx · Ignition system and misfire / P23D9

P23D9Cylinder 3 Fuel Heater Control Circuit Open

P23D9 indicates that the powertrain control module (PCM) has detected an open circuit in the fuel heater control circuit for cylinder 3. The fuel heater, used in some diesel engines to warm the fuel for better cold-weather operation, is not receiving the expected voltage or current, so the PCM sets this code.

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.