# P2201 on the 2023 Chevrolet 5500HD

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P2201

- [11006063](https://open.wenmarpro.com/bulletins/11006063), 2024-08-07: Certain vehicles may erroneously experience an illuminated Check Engine Malfunction Indicator Lamp \(MIL\) with Diagnostic Trouble Codes \(DTC\) P2201 NOx Sensor Circuit Performance Sensor 1 and/or P20EE Diesel Exhaust Fluid \(DEF\) System NOx Trap Low Efficiency. Dealers will reprogram the ECM and/or the DCU with the corrected service calibrations.