# Service bulletin No. 81\-26

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: 11037800
- Published by NHTSA: 2026\-10\-02
- Manufacturer's number: No. 81\-26
- Manufacturer's date: 2026\-09\-08
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN

## NHTSA's summary

Technical Information for Yellow Warning Message “All\-Wheel Drive System Malfunction”, “C12BEF6” and “C133700” in the All\-Wheel Electronics Control Unit

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037800-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037800-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Vehicles listed

- 2019 to 2026 PORSCHE CAYENNE
- 2024 to 2026 PORSCHE CAYENNE COUPE
- 2019 to 2026 PORSCHE CAYENNE E\-HYBRID
- 2024 to 2026 PORSCHE CAYENNE E\-HYBRID COUPE
- 2020 to 2022 PORSCHE CAYENNE GT
- 2021 to 2026 PORSCHE CAYENNE GTS
- 2024 to 2026 PORSCHE CAYENNE GTS COUPE
- 2019 to 2024 PORSCHE CAYENNE S
- 2024 to 2026 PORSCHE CAYENNE S COUPE
- 2020 PORSCHE CAYENNE S E\-HYBRID
- 2019 to 2020 PORSCHE CAYENNE TURBO
- 2023 PORSCHE CAYENNE TURBO
- 2020 PORSCHE CAYENNE TURBO COUPE
- 2024 to 2026 PORSCHE CAYENNE TURBO E\-HYBRID
- 2024 to 2026 PORSCHE CAYENNE TURBO E\-HYBRID COUPE
- 2022 to 2024 PORSCHE CAYENNE TURBO GT
- 2025 PORSCHE CAYENNE TURBO GT COUPE
- 2019 to 2023 PORSCHE CAYENNE TURBO S E\-HYBRID
- 2020 PORSCHE CAYENNE TURBO S HYB COUPE

## Recalls for the same vehicles and component

- [23V841000](/recalls/nhtsa/23V841000.md), 2023-12-13: ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:CABLE/CORD:ONBOARD
- [2020211](/recalls/tc/2020211.md), 2020-05-14: Powertrain
- [20V271000](/recalls/nhtsa/20V271000.md), 2020-05-13: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
- [19V735000](/recalls/nhtsa/19V735000.md), 2019-10-16: SERVICE BRAKES; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [19V115000](/recalls/nhtsa/19V115000.md), 2019-02-20: SERVICE BRAKES; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

## Other bulletins for the same vehicles and component

- [WTK4](/bulletins/11037860.md), 2026-10-02, Service campaign: ELECTRICAL SYSTEM. Porsche intranet posting with Campaign WTK4 information
- [No. WTK4](/bulletins/11037858.md), 2026-10-02, Service campaign: ELECTRICAL SYSTEM. Technical Information for Campaign WTK4 – Reset Vehicle Electrical System Battery
- [No. 103\-25\-2](/bulletins/11037838.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM; POWER TRAIN. Technical Information for Need to Replace Components of the High\-Voltage Battery \- High\-Voltage Battery Control Unit / Cell module; No Mixed Installation Permitted: Observe Specified Approach
- [No. 31\-26](/bulletins/11037825.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C40 Engine Oils
- [No. 30\-26](/bulletins/11037822.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils
- [No. 29\-26](/bulletins/11037818.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils
- [No. 28\-26](/bulletins/11037816.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C40 Engine Oils. Note that this bulletin covers all models back to model year 1984, for which C40 engine oils are allocated.
- [No. 27\-26](/bulletins/11037813.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils. Note that the bulletin covers all models back to model year 1984, for which C20 engine oils are allocated.
- [No. 26\-26](/bulletins/11037812.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils. Note that the bulletin includes all models back to model year 1984, for which C30 engine oils are allocated.
- [No. 25\-26](/bulletins/11037808.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche A40 Engine Oils. Note that this bulletin covers all vehicles from model year 1997 to 2020, for which A40 engine oils are assigned. Model years 1997\-2001 are not available for selection in the system.

JSON: [/v1/bulletins/11037800](/v1/bulletins/11037800)

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