# Service bulletin No. 174\-23 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: 11028571 - Published by NHTSA: 2026\-02\-06 - Manufacturer's number: No. 174\-23 - Manufacturer's date: 2026\-01\-28 - NHTSA component: ELECTRICAL SYSTEM ## NHTSA's summary Technical information for Little or No Cooling Power from the Air\-Conditioning System: Checking Refrigerant Lines on Air\-Conditioning Compressor ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028571-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028571-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system ## 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 - 2019 to 2026 PORSCHE PANAMERA - 2019 to 2024 PORSCHE PANAMERA 4 - 2026 PORSCHE PANAMERA 4 - 2019 to 2026 PORSCHE PANAMERA 4 E\-HYBRID - 2019 to 2024 PORSCHE PANAMERA 4 EXECUTIVE - 2019 to 2020 PORSCHE PANAMERA 4 SPORT TURISMO - 2019 to 2024 PORSCHE PANAMERA 4S - 2019 to 2023 PORSCHE PANAMERA 4S E\-HYBRID - 2025 to 2026 PORSCHE PANAMERA 4S E\-HYBRID - 2019 to 2024 PORSCHE PANAMERA 4S EXECUTIVE - 2019 to 2024 PORSCHE PANAMERA 4S SPORT TURISMO - 2022 to 2024 PORSCHE PANAMERA E\-HYBRID - 2019 to 2021 PORSCHE PANAMERA GTS - 2023 to 2026 PORSCHE PANAMERA GTS - 2019 to 2020 PORSCHE PANAMERA GTS SPORT TURISM - 2019 to 2020 PORSCHE PANAMERA TURBO - 2025 to 2026 PORSCHE PANAMERA TURBO E\-HYBRID - 2019 to 2020 PORSCHE PANAMERA TURBO EXECUTIVE - 2021 PORSCHE PANAMERA TURBO S - 2019 to 2023 PORSCHE PANAMERA TURBO S E\-HYBRID - 2025 to 2026 PORSCHE PANAMERA TURBO S E\-HYBRID - 2021 PORSCHE PANAMERA TURBO S EXECUTIV - 2019 to 2020 PORSCHE PANAMERA TURBO SPORT TURI ## Recalls for the same vehicles and component - [23V841000](/recalls/nhtsa/23V841000.md), 2023-12-13: ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:CABLE/CORD:ONBOARD - [23V033000](/recalls/nhtsa/23V033000.md), 2023-01-27: ELECTRICAL SYSTEM - [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. 103\-25\-2](/bulletins/11037837.md), 2026-10-02, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. 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. 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 \(PCM\) - [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. 81\-26](/bulletins/11037800.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Technical Information for Yellow Warning Message “All\-Wheel Drive System Malfunction”, “C12BEF6” and “C133700” in the All\-Wheel Electronics Control Unit - [No. 12\-26](/bulletins/11037795.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. Technical Information for Damage to Nano Plug Contacts Due to Utilization of Incorrect Measuring Equipment - [No. 43\-26](/bulletins/11037785.md), 2026-10-02, Warranty extension: VISIBILITY/WIPER; ELECTRICAL SYSTEM. Technical Information for Warranty Extension for Front Door Wiring Harness related to Real Top View \(RTV\) issues - [No. 73\-26](/bulletins/11037093.md), 2026-09-04, Service bulletin: STEERING; STRUCTURE:BODY; ELECTRICAL SYSTEM. Symptom\-based workshop manual for Vibrating Steering Wheel and Red Warning Message “Electrical System Fault” \- Observe Specified Procedure. Note that this bulletin is only applicable to all Macan Electric and Cayenne Electric models. The combustion and hybrid Cayenne and Macan variants are not applicable to this bulletin. JSON: [/v1/bulletins/11028571](/v1/bulletins/11028571) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20No.%20174-23&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11028571&vehicle=Service%20bulletin%20No.%20174-23)