# P103B on the 2019 Mack LR

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.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P103B

- [10240202](https://open.wenmarpro.com/bulletins/10240202), 2023-08-02: CBR: Mack DEF Dosing Valve Diagnostic Trouble Codes \(DTC\) P202D00, P208E00, P103B00 \- US10\+OBD13 And Newer Emissions
- [10142719](https://open.wenmarpro.com/bulletins/10142719), 2018-07-16: Mack Chassis \- Diagnostic Trouble Codes \( DTC \) P208E And P103B Logging With Possible Derate \( SCR Inducement \) \- US14\+OBD13, US14\+OBD15, US14\+OBD16 And US17\+OBD16 And Newer Emissions, Common Year Models 2015 And Newer
- [10130441](https://open.wenmarpro.com/bulletins/10130441), 2018-03-19: Diagnostic Trouble Codes \( DTC \) P208E And P103B Logging With Possible Derate \( SCR Inducement \) \- OBD15, US14\+OBD16 Emissions And Newer Rewrote test procedure for better clarity.