# U0100 on the 2019 Fiat 500X

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 U0100

- [10221201](https://open.wenmarpro.com/bulletins/10221201), 2022-09-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DTChas been set: P2110 \- Electronic Throttle Control System Bank 1 \- Forced Limited RPM. P2173 \- High Airflow/Vacuum Leak Detected \(Slow Accumulation\). U0100 \- Lost Communication With ECM/PCM. The following DTCs have been changed from a one trip fault to a two trip fault: P0607 \- ECU Internal Performance. In addition, the customer may also experience the following: The vehicle will not crank if the ECM gets hotter than 50 °C \(122°F\).
- [10194054](https://open.wenmarpro.com/bulletins/10194054), 2021-05-24: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DTChas been set: P2110 \- Electronic Throttle Control System Bank 1 \- Forced Limited RPM. P2173 \- High Airflow/Vacuum Leak Detected \(Slow Accumulation\). U0100 \- Lost Communication With ECM/PCM. The following DTCs have been changed from a one trip fault to a two trip fault: P0607 \- ECU Internal Performance. In addition, the customer may also experience the following: The vehicle will not crank if the ECM gets hotter than 50 °C \(122°F\).
- [10176582](https://open.wenmarpro.com/bulletins/10176582), 2020-06-22: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DiagnosticTrouble Code \(DTC\) has been set:U0100 \- Lost Communication With ECM/PCM. In addition, the customer may also experience the following: The vehicle will not crank if the ECM gets hotter than 50 °C \(122°F\).
- [10175584](https://open.wenmarpro.com/bulletins/10175584), 2020-05-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DiagnosticTrouble Code \(DTC\) has been set:U0100 \- Lost Communication With ECM/PCM. In addition, the customer may also experience the following:The vehicle will not crank if the ECM gets hotter than 50 °C \(122 °F\).
- [10175171](https://open.wenmarpro.com/bulletins/10175171), 2020-05-18: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DiagnosticTrouble Code \(DTC\) has been set:U0100 \- Lost Communication With ECM/PCM. In addition, the customer may also experience the following:The vehicle will not crank if the ECM gets hotter than 50 °C \(122 °F\).
- [10174251](https://open.wenmarpro.com/bulletins/10174251), 2020-04-27: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DiagnosticTrouble Code \(DTC\) has been set:U0100 \- Lost Communication With ECM/PCM. In addition, the customer may also experience the following:The vehicle will not crank if the ECM gets hotter than 50 °C \(122 °F\).