What does code P2001 mean?

Q: What does code P2001 mean?

NOx Trap Efficiency Below Threshold (Bank 2). P2001 indicates that the powertrain control module has determined the nitrogen oxide (NOx) storage efficiency of the bank 2 NOx trap has fallen below the calibrated threshold during its internal monitoring routine. The computer compares the trap's ability to adsorb NOx against a model and sets this code when the measured efficiency is too low, typically after the trap has reached operating temperature.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2001

P2001NOx Trap Efficiency Below Threshold (Bank 2)

P2001 indicates that the powertrain control module has determined the nitrogen oxide (NOx) storage efficiency of the bank 2 NOx trap has fallen below the calibrated threshold during its internal monitoring routine. The computer compares the trap's ability to adsorb NOx against a model and sets this code when the measured efficiency is too low, typically after the trap has reached operating temperature.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering and auxiliary 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.