What does code P2393 mean?

Q: What does code P2393 mean?

Diesel Intake Air Flow B Control Circuit High. P2393 indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for the diesel intake air flow control valve B, which is typically the swirl control valve or intake runner valve used to modulate air movement into the cylinders. The ECM commands the valve to move, but the circuit voltage stays above the expected range, so the module flags the circuit as high.

DTC codes / P23xx · Ignition system and misfire / P2393

P2393Diesel Intake Air Flow B Control Circuit High

P2393 indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for the diesel intake air flow control valve B, which is typically the swirl control valve or intake runner valve used to modulate air movement into the cylinders. The ECM commands the valve to move, but the circuit voltage stays above the expected range, so the module flags the circuit as high.

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.