What does code P246D mean?

Q: What does code P246D mean?

Particulate Filter Pressure Sensor A and B Correlation. P246D indicates that the powertrain control module has detected a correlation error between the two particulate filter pressure sensors, typically labeled A and B, which monitor the pressure drop across the diesel particulate filter. The computer compares the readings from both sensors and flags the code when the signals deviate from each other beyond a calibrated threshold, suggesting one sensor is inaccurate or there is a wiring or exhaust restriction issue.

DTC codes / P24xx · Auxiliary emission controls / P246D

P246DParticulate Filter Pressure Sensor A and B Correlation

P246D indicates that the powertrain control module has detected a correlation error between the two particulate filter pressure sensors, typically labeled A and B, which monitor the pressure drop across the diesel particulate filter. The computer compares the readings from both sensors and flags the code when the signals deviate from each other beyond a calibrated threshold, suggesting one sensor is inaccurate or there is a wiring or exhaust restriction issue.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.