# P0603 on the 2016 Infiniti Q50

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 P0603

- [10192745](https://open.wenmarpro.com/bulletins/10192745), 2021-05-10: IF YOU CONFIRM The MIL is "ON" with DTC P0603 \(ECM BACK UP/CIRCUIT\). ACTION 1. Confirm that the battery voltage is 11 volts, or more, with the ignition ON \(engine OFF, not running\). 2. Erase DTC 3. Perform DTC confirmation steps in the Service Procedure. 4. Confirm 1st trip DTC P0603 is not stored. NOTE: P0603 is often the result of low battery voltage, discharged battery or battery terminal disconnections. Please see this bulletin for furtner details.
- [10191928](https://open.wenmarpro.com/bulletins/10191928), 2021-05-07: MIL ON WITH DTC P062F AND/OR P0603 STORED IF YOU CONFIRM The MIL is ON and DTC P062F \(EEPROM\) and/or P0603 \(ECM BACK UP/CIRCUIT\) is stored, And The customer stated the vehicle was recently started after sitting for an extended period of time \(i.e., the battery voltage was low while attempting to start the engine\). ACTION 1. Test the vehicle’s 12 volt battery using the Midtronics DSS\-5000. Recharge or replace the battery if necessary. 2. Erase all DTCs.