What does code P2399 mean?

Q: What does code P2399 mean?

Diesel Intake Air Flow B Position Sensor Circuit High. P2399 indicates that the engine control module (ECM) has detected an abnormally high voltage signal from the intake air flow position sensor for bank B on a diesel engine. This sensor typically reports the position of a variable intake air flow control flap, and a high voltage usually means the signal circuit is shorted to power or the sensor's internal resistance has increased.

DTC codes / P23xx · Ignition system and misfire / P2399

P2399Diesel Intake Air Flow B Position Sensor Circuit High

P2399 indicates that the engine control module (ECM) has detected an abnormally high voltage signal from the intake air flow position sensor for bank B on a diesel engine. This sensor typically reports the position of a variable intake air flow control flap, and a high voltage usually means the signal circuit is shorted to power or the sensor's internal resistance has increased.

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.