What does code P2423 mean?

Q: What does code P2423 mean?

HC Adsorption Catalyst Efficiency Below Threshold (Bank 1). P2423 indicates that the powertrain control module has determined the hydrocarbon adsorption catalyst on bank 1 is not storing and releasing hydrocarbons as efficiently as designed. The computer monitors the catalyst's ability to trap hydrocarbons during cold starts and release them once the main catalyst is hot, and it sets this code when the measured efficiency falls below the calibrated threshold.

DTC codes / P24xx · Auxiliary emission controls / P2423

P2423HC Adsorption Catalyst Efficiency Below Threshold (Bank 1)

P2423 indicates that the powertrain control module has determined the hydrocarbon adsorption catalyst on bank 1 is not storing and releasing hydrocarbons as efficiently as designed. The computer monitors the catalyst's ability to trap hydrocarbons during cold starts and release them once the main catalyst is hot, and it sets this code when the measured efficiency falls below the calibrated threshold.

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.