What does code P23D2 mean?

Q: What does code P23D2 mean?

Cylinder 1 Fuel Heater Control Circuit High. P23D2 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the cylinder 1 fuel heater, which is used to warm the fuel for better cold-start performance and combustion efficiency. The PCM monitors the circuit and sets this code when the voltage exceeds the expected range, typically indicating an open circuit, a short to voltage, or a faulty heater element.

DTC codes / P23xx · Ignition system and misfire / P23D2

P23D2Cylinder 1 Fuel Heater Control Circuit High

P23D2 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the cylinder 1 fuel heater, which is used to warm the fuel for better cold-start performance and combustion efficiency. The PCM monitors the circuit and sets this code when the voltage exceeds the expected range, typically indicating an open circuit, a short to voltage, or a faulty 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.