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Bulletin #: 2500.1

Advanced Technical Information

Part ID: 9431

9YA/9YB - ‘Tail Light Faulty’ Warning in the Instrument Cluster
Vehicles Affected
Models

Model Year

Model Type

VIN Range

Vehicle-Specific Equipment

Cayenne

2024

9YA, 9YB

N/A

N/A

Revision History
Revision

Release Date

0

01/21/2025

1

12/16/2025

Changes
•
•

Original document

Technical Information and Service Information Update

Condition
The customer receives a warning message in the instrument cluster
indicating that a tail light is not working. (See Figure 1.)
The workshop confirms the customer’s observation along with one or
more of the following Rear BCM (BCM2) fault codes:
•
•
•
•

B16D6F2 - Outer right tail light – marker light defective
B16D4F2 - Outer left tail light – marker light defective
B16D7F1 - Center right tail light – LED module defective
B16D5F1 - Center left tail light – LED module defective

Generally, however, the tail light does work as observed from outside
the vehicle. The warning and faults are a false alarm.

AfterSales

Figure 1

Dec 16, 2025
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Bulletin #: 2500.1

Advanced Technical Information

Part ID: 9431

9

Technical Background
Intermittently, the tail lights’ internal communication can get stuck. This condition sends an unwanted failure
message to the BCM2. The BCM2 interprets this as a possible loss of tail light function, consequently records a
fault, and sends a warning to the instrument cluster.

Service Information
In the event of a customer complaint as described above, complete the following:
1.
2.

3.

Please create a VAL to document the occurrence of the fault.
Replace the rear tail light with the updated part number. Reference the table below.

Old

New

9Y3945307D

9Y3945307H

9Y3945307E

9Y3945307J

9Y3945307F

9Y3945307K

9Y3945307G

9Y3945307L

9Y0945307D

9Y0945307H

9Y0945307E

9Y0945307J

9Y0945307F

9Y0945307K

9Y0945307G

9Y0945307L

9Y0945092R

9Y0945092AF

9Y0945092T

9Y0945092AG

9Y0945092S

9Y0945092AH

9Y0945092AA

9Y0945092AJ

9Y0945091T

9Y0945091AG

9Y0945091S

9Y0945091AH

9Y0945091AA

9Y0945091AJ

9Y0945091R

9Y0945091AF

If the fault persists after replacement, please continue with other means of diagnosis.

AfterSales

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Bulletin #: 2500.1

Advanced Technical Information

Part ID: 9431

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Warranty
For documentation and warranty invoicing, enter the working position and PCSS encryption specified below in the
warranty claim:
APOS

Labor operation

I No.

03350050

On board diagnostic

03350053

On board diagnostic – Create VAL

94315503

Rear light replace

PCSS Encoding:
Location (FES5)

94310

Rear light

Damage type (SA4)

1611

No function

Search Items
Taillamps, taillights, rear, back, lamp, false warning, E3-PA

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.

6000018196
©2025 Porsche Cars North America, Inc.

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