What does code P23DD mean?

Q: What does code P23DD mean?

Cylinder 4 Fuel Heater Control Circuit Open. P23DD means the engine control module (ECM) has detected an open circuit in the electrical path that feeds the fuel heater for cylinder 4. The ECM commands the heater on and monitors the circuit, and it sees no current flow or an unexpected voltage, so it flags the circuit as open.

DTC codes / P23xx · Ignition system and misfire / P23DD

P23DDCylinder 4 Fuel Heater Control Circuit Open

P23DD means the engine control module (ECM) has detected an open circuit in the electrical path that feeds the fuel heater for cylinder 4. The ECM commands the heater on and monitors the circuit, and it sees no current flow or an unexpected voltage, so it flags the circuit as open.

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.