Bulletin #: 2121

Advanced Technical Information

Part ID: 9102

9

9YA ACC Dynamic Calibration Fault C110300
Vehicles Affected
Models

Model Year

Model Type

VIN Range

Vehicle-Specific Equipment

Cayenne

As of 2019 up to 2021

9YA

N/A

N/A

Revision History
Revision

Release Date

Changes

0

September 17, 2021

Original document

Condition
The customer reports a warning in the instrument cluster that tells the driver that ACC is not available. The workshop
confirms this condition and finds fault code C110300. This failure mode indicates vertical alignment calibration has
failed.

Technical Background
This condition is exacerbated by a heavy load in the vehicle’s cabin and by towing. Additionally, after an alignment,
the vehicle may also fail its calibration.
Porsche plans for a permanent solution to this condition in future software. Until this software is available, please
use the following recommendations.

AfterSales

Sep 17, 2021
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Bulletin #: 2121

Advanced Technical Information

Part ID: 9102

9

Service Information
Recommended steps:
•
Fill the fuel tank and place 50 lbs. or more in the rear luggage compartment. Drive the vehicle at least 20
miles. This should fully settle the suspension.
•
Do not put the vehicle on a lift or do anything to raise (decompress) the suspension (e.g. avoid abrupt stops
and hard braking).
•
Check and document the vehicle ride height as per the workshop manual. (See WM 4495TW – Adjustment
values for suspension alignment.)
•
Compare the measured vehicle ride height to the workshop manual. (See WM 449503 Performing front +
rear suspension alignment.)
•
Perform the adaptive cruise control calibration procedure as per the workshop manual and tester instruc-
tions.
•
Road test the vehicle using these guidelines:
Drive the vehicle at a constant speed between 45-65 mph.
Safely follow another vehicle. Stay at a distance about 150 feet away.
Drive on a flat and straight road for approximately 15-20 miles.
Drive under clear conditions. That is without precipitation or other bad weather.
Monitor and graph the actual values for vertical misalignment/maladjustment. Capture a video
recording or screen shot.
If your static calibration is good, the misalignment value will be constant. The closer the value is to
0°, the better.
Search Items
ACC, adaptive, distance measuring, ZFAS, assistance systems

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are
written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in
order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and
may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester
are the ones that must be followed.

©2021 Porsche Cars North America, Inc.

AfterSales

Sep 17, 2021
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