# Service bulletin No. 2521.1

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: 11024154
- Published by NHTSA: 2025\-10\-08
- Manufacturer's number: No. 2521.1
- Manufacturer's date: 2025\-09\-26
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

Instructions on advanced technical information for the Cayenne. DME P242100 – Fuel Tank Isolation Valve for Tank Ventilation System Stuck Open

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11024154-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11024154-9999.pdf)

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

## Components

Fuel system

## Trouble codes named

P2421

## Vehicles listed

- 2024 to 2026 PORSCHE CAYENNE
- 2024 to 2026 PORSCHE CAYENNE COUPE
- 2024 to 2026 PORSCHE CAYENNE E\-HYBRID
- 2024 to 2025 PORSCHE CAYENNE E\-HYBRID COUPE
- 2024 PORSCHE CAYENNE GTS
- 2024 PORSCHE CAYENNE S
- 2024 PORSCHE CAYENNE S COUPE
- 2024 PORSCHE CAYENNE TURBO E\-HYBRID
- 2024 PORSCHE CAYENNE TURBO GT

## Recalls for the same vehicles and component

- [2025498](/recalls/tc/2025498.md), 2025-09-23: Fuel System
- [25V634000](/recalls/nhtsa/25V634000.md), 2025-09-23: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

## Other bulletins for the same vehicles and component

- [No. 84\-26](/bulletins/11037804.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM; STRUCTURE:BODY. Technical Information for Filler Flap on Vehicles with Hybrid Drive System \(PHEV\) Does Not Close
- [No. 2433\-4](/bulletins/11037061.md), 2026-09-04, Service bulletin: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. Information on Advanced Technical Information for Porsche Mobile Charger NEMA Supply Cable Initialization Failure
- [No. 2315\-1](/bulletins/11037060.md), 2026-09-04, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. Information on Advanced Technical Information for Porsche Mobile Charger Plus \(PMC\+\) Red LEDs and Fault B191E49
- [No. D785](/bulletins/11033625.md), 2026-06-05, Service bulletin: FUEL/PROPULSION SYSTEM; STRUCTURE:BODY; ELECTRICAL SYSTEM. Parts information for parts withdrawal involving 9J1827447B, PAA971221B, and 95B201060AA. The lock, the fuel tank attachments, and the module connector. The vehicles affected are ones that use the part number\(s\) mentioned.
- [nO. d766](/bulletins/11029194.md), 2026-03-02, Service bulletin: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. Parts information for parts withdrawal involving the fuel filler flap and the charge cable for mains socket. Part numbers 976809857E and 7PP971678GS
- [No. D764](/bulletins/11029155.md), 2026-03-02, Service bulletin: FUEL/PROPULSION SYSTEM. Parts information for parts withdrawal involving the multi\-purpose additive for gasoline. Part number is 00004320902. The vehicles affected are ones that use part number mentioned.
- [No. D756](/bulletins/11028582.md), 2026-02-06, Service bulletin: FUEL/PROPULSION SYSTEM. Parts information for parts withdrawal involving the \- Diagnosis Pump for Fuel System 958906243B and 958906243A. Vehicles affected are ones that use either of the part numbers mentioned.
- [No. 2508](/bulletins/11016771.md), 2025-04-07, Service bulletin: ENGINE; ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. Advanced Technical Information \- 9YA, 9YB, YAA PHEV\- HV Battery Control Unit \(BMC\) Software Updates
- [No. 10\-25](/bulletins/11016731.md), 2025-04-07, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM; ENGINE. Technical Information \- Malfunction Indicator Light Active / Fault Memory Entry "P242100" or "P242200" in DME Control Unit: Observe Guided Troubleshooting \(10 / 25\)
- [No. 2502](/bulletins/11015195.md), 2025-03-06, Service bulletin: FUEL/PROPULSION SYSTEM; POWER TRAIN. Advanced Technical Information \- 9YA, 9YB PHEV\- HV Power Electronics SW Update

JSON: [/v1/bulletins/11024154](/v1/bulletins/11024154)

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