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Service bulletin No. 55-20

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 id10186357
Published by NHTSA2021-02-01
Manufacturer's numberNo. 55-20
Manufacturer's date2021-01-08
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING

NHTSA's summary

Instructions for reprogramming the DME control unit in the event that the engine is running rough near the idle range.

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

Electrical system, Engine, Software

Vehicles listed
PORSCHE MACAN2019, 2020

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
PIWIS2401j2024-03-04. Service bulletin. Information for PIWIS tester update 42.500.020
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No. 85-202020-08-05. Service bulletin. Instructions for reprogramming the instrument cluster in the event of the park assist buzzer sporadically cutting out.
PIWIS2001v2020-07-02. Service bulletin. Information on new PIWIS tester update 39.500.020 and .025.
No. 41-202020-07-01. Service bulletin. Instructions on how to perform a PVTS Software update in the event that a car will not start.
No. 20052020-06-02. Service bulletin. Information on new VCI cables available for purchase by dealers.
122-E5C9R-012020-01-03. Service bulletin. Instructions for clearing a fault code for a temporary brake warning caused by vacuum actuation as a result of Porsche Stability Management.
122-Q8P6C-122019-12-04. Service bulletin. Information about providing a map update on some vehicles' navigation system.