# Service bulletin No. 28\-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: 11032272
- Published by NHTSA: 2026\-05\-06
- Manufacturer's number: No. 28\-26
- Manufacturer's date: 2026\-04\-08
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM

## NHTSA's summary

Technical information for Transmission Warning Message “P Not Available”, Fault Memory Entries for Parking Lock Buttons in the Shift Console and Transmission Electronics \(PDK\) Control Units

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032272-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032272-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Vehicles listed

- 2020 to 2024 PORSCHE 911

## Recalls for the same vehicles and component

- [20V381000](/recalls/nhtsa/20V381000.md), 2020-07-01: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT
- [2019291](/recalls/tc/2019291.md), 2019-06-12: Powertrain
- [19V445000](/recalls/nhtsa/19V445000.md), 2019-06-12: POWER TRAIN:AXLE HUBS; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT

## Other bulletins for the same vehicles and component

- [No. 91\-26](/bulletins/11037847.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Technical Information for Particles/Metal Chips/Residues in Engine Oil
- [No. 32\-26](/bulletins/11037826.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of approved Porsche C40 GT engine oils
- [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.
- [No. 86\-26](/bulletins/11037805.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Technical Information for Vehicle Color in Front Display/Control Panel Wrong after Replacing Central Computer \(PCM\)

JSON: [/v1/bulletins/11032272](/v1/bulletins/11032272)

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