# Service bulletin 18\-029\-20 REV. A

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: 10176582
- Published by NHTSA: 2020\-06\-22
- Manufacturer's number: 18\-029\-20 REV. A
- Manufacturer's date: 2020\-05\-19
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM; 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-10176582-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10176582-9999.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](/bulletins/10174251.md), 2020-04-27, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); 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/10176582](/v1/bulletins/10176582)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2018-029-20%20REV.%20A&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10176582&vehicle=Service%20bulletin%2018-029-20%20REV.%20A)