What does code P25BA mean?

Q: What does code P25BA mean?

Regeneration Control Switch Circuit/Open. P25BA indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the regeneration control switch circuit, which is used to command a manual regeneration of the diesel particulate filter (DPF). The PCM monitors the switch input and sets this code when the signal voltage falls outside the expected range, typically indicating a broken wire, poor connection, or faulty switch.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25BA

P25BARegeneration Control Switch Circuit/Open

P25BA indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the regeneration control switch circuit, which is used to command a manual regeneration of the diesel particulate filter (DPF). The PCM monitors the switch input and sets this code when the signal voltage falls outside the expected range, typically indicating a broken wire, poor connection, or faulty switch.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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