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Service bulletin No. 173-20

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10183511
Published by NHTSA2020-12-02
Manufacturer's numberNo. 173-20
Manufacturer's date2020-11-25
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); EQUIPMENT

NHTSA's summary

Instructions for fixing the navigation in the PCM in the event that it is loading slowly.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Transmission and driveline, Automatic transmission, Transmission control module

Vehicles listed
PORSCHE CAYENNE2018, 2019
PORSCHE MACAN2018, 2019

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
No. 93-212022-06-03. Service bulletin. Technical information on the PCM - does not work, reset central computer
WMD12021-06-03. Service bulletin. Porsche intranet posting with preliminary information for Porsche workshop campaign WMD1 Workshop Campaign -PCM Software Update.
No. 20372020-11-06. Service bulletin. Special Tools information for Transmission oil Filler tool on the new Cayenne.
No. 20202020-10-01. Service bulletin. Information on new special tool for offline updates of the PCM Versions 4 and 5.
No. 118-202020-09-02. Service bulletin. Instructions for how to assist if the selector lever is in Park position but not detected, and the key cannot be removed.
122-B6P3D-032018-03-13. Service bulletin. Symptom: Hard or jerky gear changes. Cause: This is caused by the transition phase when changing from the engaged gear to the target gear. Various components of the powertrain affect the shifting quality. Remedial Action: In the event of a customer complaint, use PIWIS Tester III with software 36.400.020 (or higher) installed to: ? re-program and code the Tiptronic control unit via "Automatic programming" and ? reset the adaptation values.