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Service bulletin A391821 2051558-

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 id10144640
Published by NHTSA2018-09-17
Manufacturer's numberA391821 2051558-
Manufacturer's date2018-06-15
NHTSA componentEQUIPMENT:MECHANICAL; POWER TRAIN:CLUTCH ASSEMBLY

NHTSA's summary

This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00.

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, Clutch

Trouble codes named

C05ED

Vehicles listed
AUDI A4 ALLROAD2017, 2018
AUDI A52018
AUDI A5 CABRIOLET2018
AUDI ALLROAD2017 to 2018
AUDI Q52018

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
A3020282053597_42020-09-03. Service bulletin. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
Dealer - 39E72019-05-06. Service bulletin. Replace All-Wheel Drive Clutch
A301722 2019850-2018-02-05. Service bulletin. This technical service bulletin provides guidelines for diagnosing the clutch plate.
A371430 2003658-2017-11-08. Service bulletin. Supersedes Technical Service Bulletin Group 37 number 13-07 dated May 29, 2013. Customer states that the engine returns to idle speed of approximately 1,400 RPM although the accelerator is depressed, and/or the vehicle hesitates (lacks power on take-off). No DTCs are stored. This condition may be caused when the brake pedal and the accelerator pedal are depressed simultaneously. Drivers who drive with their left foot resting on the brake pedal are prone to experience this condition.