Bulletin No.: PIC6123D
Published date: N/A

Preliminary Information
PIC6123D Adaptive Cruise Temporarily Unavailable Message Lane
Keep Assist (LKA) Inoperative in High Ambient Temperatures
Models
Brand:

Model:

Model Years:

VIN:
from

to

Engine:

Transmissions:

Cadillac

ATS

2013 - 2019

All

ALL

ALL

ALL

Cadillac

CTS (VIN A)

2014 - 2019

ALL

ALL

ALL

ALL

Cadillac

CT6

2016 - 2019

All

ALL

ALL

ALL

Cadillac

XTS

2013 - 2019

ALL

ALL

ALL

ALL

Cadillac

XT5

2017 - 2019

ALL

ALL

ALL

ALL

Cadillac

Escalade Models

2015 - 2019

ALL

ALL

ALL

ALL

Cadillac

SRX

2013 - 2017

ALL

ALL

ALL

ALL

GMC

Acadia

2017 - 2019

ALL

ALL

ALL

ALL

Supersession Statement
This PI was updated to add models. Please discard PIC6123C.

Condition / Concern
Some customers may comment that an Adaptive Cruise Temporarily Unavailable message is
displayed In the DIC when attempting to use Cruise Control after the vehicle has been parked
in direct sunlight in high ambient temperatures. Furthermore it may be noticed that the Lane
Keep Assist (LKA) will also be inoperable on startup and the LED indicator on the LKA switch
will not be illuminated. If the LKA switch is pressed in this state, the DIC will display Lane
Keep Assist Unavailable.
If the Cameras internal ECU temperature exceeds 85 degrees C (185 deg. F) the image
sensor will shut down. (The internal operating temperature range for the image sensor is -40
deg. C to 85 deg. C. (-40 deg. F to 185 deg. F.)) When this happens the image processor no
longer functions and as a result Adaptive Cruise Control and Lane Keep Assist will be
unavailable until the temperature falls within the operating range.
There are two failure modes based on the ECU temperature, the data seen in GDS will be
different depending on which failure mode is present.
1. First stage:
Adaptive Cruise Temporarily Unavailable Message
LKA does not function
Image Sensor in front View Camera Module (FVCM) stops functioning.
GDS Data
a. Disengage history shows Active Safety Control Module as YES for loss of
communication.
2. Second Stage:
Adaptive Cruise Temporarily Unavailable Message
LKA does not function
Image Sensor in front View Camera Module (FVCM) stops functioning.
FVCM stops functioning on the bus.

GDS Data:
a. Disengage history shows Active Safety Control Module as YES for loss of
communication.
b. Disengage history shows Front View Camera Module as YES for loss of
communication.
c. U026A sets.

Recommendations / Instructions
Advise the customer this is Normal Operation in high ambient temperatures with the vehicle
parked in direct sunlight.
When the temperature of the FVCM drops to within normal operating range during the same
drive cycle, the Adaptive Cruise and Lane Keep Assist will return to normal operation.
Tips:
Avoiding parking in direct sunlight during high ambient temperatures will lessen the chances
of this occurring.
Driving with the Air Conditioning on will assist in decreasing the cabin/FVCM temperature as
quickly as possible.

Customer Information
Please communicate to the customer this condition is a normal operating characteristic of
their vehicle. It will not impact the designed performance or reliability of the vehicle. Please
share this information with the customer, including a copy of this message.

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