# Service bulletin 2055589/4

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: 10206218
- Published by NHTSA: 2022\-01\-08
- Manufacturer's number: 2055589/4
- Manufacturer's date: 2021\-12\-14
- NHTSA component: EXTERIOR LIGHTING; ELECTRICAL SYSTEM; EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS

## NHTSA's summary

Outer daytime running light/s not working \- Warning message within the DIP. Customer statement: \- Left and/or right outer daytime running light/s not working \(Figure 1\). Workshop Findings: \- DTC C10EF04 evident within Diagnostic address 29 Light control left and/or 39 Light control right Technical background: A software error in the headlight control modules can lead to malfunctions with the front Daytime Running Lights. The instructions within this TPI are for vehicles with Low specification lights\(PR code 9C7\) The instructions are not applicable to vehicles with High specification lights \(PR code 8K9\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206218-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206218-9999.pdf)

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

## Components

Electrical system, Lighting, Headlights

## Trouble codes named

C10EF

## Vehicles listed

- 2018 to 2022 BENTLEY CONTINENTAL GT
- 2018 to 2022 BENTLEY CONTINENTAL GT CABRIO

## Other bulletins for the same vehicles and component

- [2061857/3](/bulletins/10201765.md), 2021-10-04, Service bulletin: EXTERIOR LIGHTING:HEADLIGHTS:SWITCH; ELECTRICAL SYSTEM. Headlamp switch \- Inoperative/Not illuminated \- DTC U110B00 within 09\-Central Electrics \(BCM1\) Customer statement: Headlamp switch \- Inoperative/Not illuminated Workshop findings: DTC U110B00within 09\-CentralElectrics \(BCM1\), Figure in attachment \-Yellow warning light / message within the DIP\(Adaptive Lighting Fault\) NOTE: Some lighting functionalities can in some cases be lost for example: \-Rear fog light activation \-All weather lighting mode activation \-Head lamps default to dipped beam however high beam will still activate manually NOTE: Recycling the ignition will not resolve the problem Technical background: The issue will not occur when the ignition is on and/or the vehicle is being driven. It occurs as the headlamp switch goes into a “sleep” state after ignition is Switched OFF, the issue is then evident to the driver when the ignition is next switched ON.
- [2054599\-3](/bulletins/10165310.md), 2019-09-23, Service bulletin: EXTERIOR LIGHTING:HEADLIGHTS. Headlamp operation issues

JSON: [/v1/bulletins/10206218](/v1/bulletins/10206218)

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