What does code P24A4 mean?

DTC codes / P24xx · Auxiliary emission controls / P24A4

P24A4Particulate Filter Restriction Soot Accumulation Too High Bank 1

P24A4 indicates that the powertrain control module has determined the diesel particulate filter on bank 1 has accumulated more soot than the calibrated threshold allows, based on exhaust pressure sensor readings across the filter. The code is set when the measured restriction exceeds the expected value for the current operating conditions, signaling that the filter is loading faster than regeneration can keep up with.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.