Service bulletin 2121.4
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 | 11035741 |
| Published by NHTSA | 2026-08-05 |
| Manufacturer's number | 2121.4 |
| Manufacturer's date | 2026-07-29 |
| NHTSA component | VEHICLE SPEED CONTROL; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL |
| Manufacturer's system | Electrical |
NHTSA's summary
ACC Dynamic Calibration Fault C110300
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Driver assistance, Throttle and cruise control, Adaptive cruise control
Trouble codes named
C1103
| PORSCHE CAYENNE | 2019, 2020, 2021, 2022, 2023, 2024, 2025 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| No. 2606-1 | 2026-09-04. Service bulletin. Information on Advanced Technical Information for E3II V8 Cayenne – Various Assistance System Warning Messages in the Instrument Cluster due to Implausible Drivetrain Coordinator Status |
|---|---|
| No. 2606 | 2026-09-04. Service bulletin. Information on Advanced Technical Information for E3II V8 Cayenne – Various Assistance System Warning Messages in the Instrument Cluster due to Implausible Drivetrain Coordinator Status |
| No. 11-25-4 | 2026-09-04. Service bulletin. Technical Information for White Messages Regarding Driver Assistance Systems in Conjunction with Passive Fault Memory Entries in the ZFAS Control Unit |
| No. 11-25 | 2026-01-06. Service bulletin. Technical information for Various Error Messages Regarding Driver Assistance Systems in the Instrument Cluster in Conjunction With Passive Fault Memory Entries in the Driver Assistance Systems Control Unit - ZFAS |
| No. 75-25-1 | 2025-12-05. Service bulletin. Technical information for Various White Messages Regarding Driver Assistance Systems In the Instrument Cluster/Fault Memory Entry "C12D5FA" In the Control Unit for Driver Assistance Systems |
| No. 2503.3 | 2025-12-05. Service bulletin. Instructions on advanced technical information for Troubleshooting Advanced Driver Assistance Systems (ADAS) |
| No. 2503.2 | 2025-08-06. Service bulletin. Instructions on advanced technical information for troubleshooting ADAs systems |
| No. 2121.3 | 2025-08-04. Service bulletin. Instructions on advanced technical information for the Cayenne - ACC Dynamic Calibration Fault C110300 |
| No. 2503.1 | 2025-07-09. Service bulletin. Instructions on advanced technical information for the advanced driver assistance systems. Please refer to PDF attached for more information regarding this. |
| No. 2121.2 | 2024-08-06. Service bulletin. Instructions on advanced technical information for the Cayenne - dynamic calibration fault C110300 |