NTB18-062

2018 ARMADA; MIL ON WITH DTC P0138 AND/OR P0158 IF YOU CONFIRM The MIL is ON with one or both of the following DTCs: - P0138 (Heated oxygen sensor heater 2 [bank 1] circuit high voltage) - P0158 (Heated oxygen sensor heater 2 [bank 2] circuit high voltage) And There are no drivability issues. ACTION 1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM.