# 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.

- Type: Service bulletin
- NHTSA id: 10144640
- Published by NHTSA: 2018\-09\-17
- Manufacturer's number: A391821 2051558\-
- Manufacturer's date: 2018\-06\-15
- NHTSA component: EQUIPMENT: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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10144640-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10144640-0001.pdf)

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

## Components

Equipment and accessories, Transmission and driveline, Clutch

## Trouble codes named

C05ED

## Vehicles listed

- 2017 to 2018 AUDI A4 ALLROAD
- 2018 AUDI A5
- 2018 AUDI A5 CABRIOLET
- 2017 to 2018 AUDI ALLROAD
- 2018 AUDI Q5

## Other bulletins for the same vehicles and component

- [A3020282053597\_4](/bulletins/10178818.md), 2020-09-03, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT; POWER TRAIN:CLUTCH ASSEMBLY:BELL HOUSING. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
- [Dealer \- 39E7](/bulletins/10159396.md), 2019-05-06, Service bulletin: POWER TRAIN; POWER TRAIN:CLUTCH ASSEMBLY. Replace All\-Wheel Drive Clutch
- [A301722 2019850\-](/bulletins/10128346.md), 2018-02-05, Service bulletin: POWER TRAIN:CLUTCH ASSEMBLY. This technical service bulletin provides guidelines for diagnosing the clutch plate.
- [A371430 2003658\-](/bulletins/10122465.md), 2017-11-08, Service bulletin: POWER TRAIN:CLUTCH ASSEMBLY:PEDAL/HAND LEVER\(MOTORCYCLE\). 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.

JSON: [/v1/bulletins/10144640](/v1/bulletins/10144640)

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