What does code P24B3 mean?

Q: What does code P24B3 mean?

Particulate Matter Sensor Heater Control Circuit Open. P24B3 means the engine control module has detected an open circuit in the heater element of the particulate matter sensor, which is used on diesel vehicles to monitor soot in the exhaust. The computer commands the heater on and expects to see a specific current draw or voltage drop, but it sees none, indicating a broken wire, failed heater, or poor connection.

DTC codes / P24xx · Auxiliary emission controls / P24B3

P24B3Particulate Matter Sensor Heater Control Circuit Open

P24B3 means the engine control module has detected an open circuit in the heater element of the particulate matter sensor, which is used on diesel vehicles to monitor soot in the exhaust. The computer commands the heater on and expects to see a specific current draw or voltage drop, but it sees none, indicating a broken wire, failed heater, or poor connection.

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.