What does code P23DE mean?

Q: What does code P23DE mean?

Cylinder 4 Fuel Heater Control Circuit High. P23DE means the engine computer has detected an abnormally high voltage on the control circuit for the fuel heater built into cylinder 4's fuel injector or fuel rail. The computer expects the heater circuit to draw current and pull the voltage down when commanded on, so a voltage that stays high tells it the circuit is open, shorted to power, or the heater element itself has failed.

DTC codes / P23xx · Ignition system and misfire / P23DE

P23DECylinder 4 Fuel Heater Control Circuit High

P23DE means the engine computer has detected an abnormally high voltage on the control circuit for the fuel heater built into cylinder 4's fuel injector or fuel rail. The computer expects the heater circuit to draw current and pull the voltage down when commanded on, so a voltage that stays high tells it the circuit is open, shorted to power, or the heater element itself has failed.

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.