# Service bulletin No. 2503.2

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: 11021643
- Published by NHTSA: 2025\-08\-06
- Manufacturer's number: No. 2503.2
- Manufacturer's date: 2025\-07\-22
- NHTSA component: LANE DEPARTURE: WARNING; LANE DEPARTURE: ASSIST; FORWARD COLLISION AVOIDANCE: WARNINGS; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

## NHTSA's summary

Instructions on advanced technical information for troubleshooting ADAs systems

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021643-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021643-9999.pdf)

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

## Components

Driver assistance, Adaptive cruise control, Lane departure and lane keeping

## Vehicles listed

- 2020 to 2026 PORSCHE 911
- 2022 PORSCHE 911 4S
- 2020 to 2025 PORSCHE 911 CARRERA
- 2023 PORSCHE 911 CARRERA 4
- 2022 to 2023 PORSCHE 911 CARRERA 4 GTS
- 2023 PORSCHE 911 CARRERA 4S
- 2022 to 2024 PORSCHE 911 CARRERA GTS
- 2020 to 2021 PORSCHE 911 CARRERA S
- 2023 PORSCHE 911 CARRERA S
- 2023 to 2024 PORSCHE 911 CARRERA T
- 2023 to 2024 PORSCHE 911 DAKAR
- 2021 to 2025 PORSCHE 911 GT3
- 2023 to 2024 PORSCHE 911 GT3 RS
- 2022 to 2023 PORSCHE 911 GT3 TOURING
- 2020 to 2021 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4S
- 2023 PORSCHE 911 TARGA GTS
- 2020 to 2023 PORSCHE 911 TURBO
- 2021 to 2023 PORSCHE 911 TURBO S
- 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
- 2024 to 2025 PORSCHE MACAN 4 ELECTRIC
- 2025 PORSCHE MACAN 4S ELECTRIC
- 2024 to 2025 PORSCHE MACAN ELECTRIC
- 2024 to 2025 PORSCHE MACAN TURBO ELECTRIC
- 2024 PORSCHE PANAMERA
- 2026 PORSCHE PANAMERA
- 2024 PORSCHE PANAMERA 4
- 2024 to 2026 PORSCHE PANAMERA 4 E\-HYBRID
- 2024 PORSCHE PANAMERA 4 EXECUTIVE
- 2024 PORSCHE PANAMERA 4S
- 2024 PORSCHE PANAMERA 4S EXECUTIVE
- 2024 PORSCHE PANAMERA 4S SPORT TURISMO
- 2024 PORSCHE PANAMERA E\-HYBRID
- 2024 PORSCHE PANAMERA GTS
- 2020 to 2026 PORSCHE TAYCAN
- 2021 to 2024 PORSCHE TAYCAN 4 CROSS TURISMO
- 2020 to 2024 PORSCHE TAYCAN 4S
- 2021 to 2024 PORSCHE TAYCAN 4S CROSS TURISMO
- 2020 to 2023 PORSCHE TAYCAN CROSS TURISMO
- 2022 to 2024 PORSCHE TAYCAN GTS
- 2022 to 2024 PORSCHE TAYCAN GTS SPORT TURISMO
- 2020 to 2024 PORSCHE TAYCAN TURBO
- 2026 PORSCHE TAYCAN TURBO
- 2021 to 2024 PORSCHE TAYCAN TURBO CROSS TURISM
- 2025 PORSCHE TAYCAN TURBO GT
- 2020 to 2024 PORSCHE TAYCAN TURBO S
- 2021 to 2024 PORSCHE TAYCAN TURBO S CROSS TURI

## Other bulletins for the same vehicles and component

- [No. 2606\-1](/bulletins/11037063.md), 2026-09-04, Service bulletin: FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: WARNINGS; ENGINE; VEHICLE SPEED CONTROL. 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](/bulletins/11037062.md), 2026-09-04, Service bulletin: FORWARD COLLISION AVOIDANCE: WARNINGS; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; ENGINE; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; VEHICLE SPEED CONTROL. 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](/bulletins/11037046.md), 2026-09-04, Service bulletin: FORWARD COLLISION AVOIDANCE: WARNINGS; LANE DEPARTURE: ASSIST; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. Technical Information for White Messages Regarding Driver Assistance Systems in Conjunction with Passive Fault Memory Entries in the ZFAS Control Unit
- [No. 75\-25](/bulletins/11037045.md), 2026-09-04, Service bulletin: LANE DEPARTURE: ASSIST; BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING; FORWARD COLLISION AVOIDANCE: WARNINGS; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. Technical Information for Various White Messages Regarding Driver Assistance Systems/Fault Memory Entry "C12D5FA" in the ZFAS Control Unit
- [2121.4](/bulletins/11035741.md), 2026-08-05, Service bulletin: VEHICLE SPEED CONTROL; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. ACC Dynamic Calibration Fault C110300
- [No. 24\-26](/bulletins/11030881.md), 2026-04-07, Service bulletin: ELECTRICAL SYSTEM; LANE DEPARTURE: ASSIST. Symptom based workshop manual for a Message “Active Lane Keeping Currently Not Available”, Fault in Front Driver’s Side Door Control Unit “U14B700” in Distance Measuring Sensor \(ACC\) Control Unit
- [No. 11\-25](/bulletins/11027134.md), 2026-01-06, Service bulletin: FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; LANE DEPARTURE: ASSIST; LANE DEPARTURE: WARNING; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: WARNINGS. 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\-2](/bulletins/11026411.md), 2025-12-05, Service bulletin: FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; FORWARD COLLISION AVOIDANCE: WARNINGS; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; LANE DEPARTURE: ASSIST; LANE DEPARTURE: WARNING. 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. 75\-25\-1](/bulletins/11026410.md), 2025-12-05, Service bulletin: FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: WARNINGS; LANE DEPARTURE: ASSIST; LANE DEPARTURE: WARNING. 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. 75\-25](/bulletins/11026409.md), 2025-12-05, Service bulletin: LANE DEPARTURE: WARNING; LANE DEPARTURE: ASSIST; FORWARD COLLISION AVOIDANCE: WARNINGS; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. 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

JSON: [/v1/bulletins/11021643](/v1/bulletins/11021643)

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