What does code P243B mean?

Q: What does code P243B mean?

Particulate Filter Restriction Forced Limited Power Bank 2. P243B indicates that the engine control module has detected an excessive restriction in the bank 2 particulate filter, forcing the system into a limited-power mode to protect the filter and exhaust components. The computer compares pressure readings before and after the filter and triggers this code when the restriction exceeds a calibrated threshold.

DTC codes / P24xx · Auxiliary emission controls / P243B

P243BParticulate Filter Restriction Forced Limited Power Bank 2

P243B indicates that the engine control module has detected an excessive restriction in the bank 2 particulate filter, forcing the system into a limited-power mode to protect the filter and exhaust components. The computer compares pressure readings before and after the filter and triggers this code when the restriction exceeds a calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

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.