# Service bulletin 18\-029\-20

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10174251
- Published by NHTSA: 2020\-04\-27
- Manufacturer's number: 18\-029\-20
- Manufacturer's date: 2020\-03\-27
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE

## NHTSA's summary

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 \(122 °F\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174251-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174251-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine, Transmission and driveline, Automatic transmission, Transmission control module

## Trouble codes named

U0100

## Vehicles listed

- 2019 FIAT 500X

## Other bulletins for the same vehicles and component

- [1803921](/bulletins/10221201.md), 2022-09-26, Service bulletin: EXTERIOR LIGHTING; ELECTRICAL SYSTEM:ADAS:CONTROL MODULE; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). 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 \(122°F\).
- [18\-029\-20 REV. A](/bulletins/10176582.md), 2020-06-22, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM; ENGINE. 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 \(122°F\).

JSON: [/v1/bulletins/10174251](/v1/bulletins/10174251)

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