# Service bulletin LI82.85\-P\-079088 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: 11036237 - Published by NHTSA: 2026\-08\-18 - Manufacturer's number: LI82.85\-P\-079088 - Manufacturer's date: 2026\-08\-14 - NHTSA component: ELECTRICAL SYSTEM ## NHTSA's summary Complaint The following most common complaints may be observed: • Brief connectivity interruptions when using Apple CarPlay over Wi\-Fi • Audio cuts out • Device not recognized • No operation possible Cause There are multiple possible causes for an iPhone disconnecting from a vehicle’s head unit while using Apple CarPlay. These include hardware, software, and environmental factors: Environmental Interference External Sources: • Passing under toll bridges, driving near airports, or areas with heavy electronic interference \(e.g., as described in LI82.85\-P\-076157\) can cause connection drops. Cellular Networks: • Interference from nearby cell towers operating on similar frequencies \(usually 2.4GHz or 5GHz\) can disrupt the signal. Storage Location: • Keeping your phone in a handbag or surrounded by other objects inside the vehicle can create physical or electronic interference. Device and Software Issues Head Unit Software/Hardware: • Outdated firmware, bugs, or hardware faults in the vehicle’s head unit can prevent a stable connection. iPhone Software/Hardware: • Similar issues in the iPhone, including buggy iOS updates or hardware problems, may affect performance. Reset or Reboot:• Automatic rebooting or resetting of either the head unit or the iPhone will temporarily disrupt CarPlay. Connection and Settings Wired Connections: • Faulty Cable: A damaged or poor\-quality USB cable can cause intermittent or total loss of connection. • USB Port Issues: Dust, debris, or physical damage in the USB port of either the head unit or the iPhone can also lead to disconnects. Wireless Connections: • Intermittent Bluetooth/Wi\-Fi: Unstable wireless communication \(Bluetooth/Wi\-Fi\) can frequently break the Car\- Play connection. Power Management: • Battery Saver Mode: Enabling low power mode may restrict background processes, affecting CarPlay. • Vehicle’s Electrical System: Unstable power delivery from the car’s battery or electrical interruptions can cause the head unit to malfunction. Phone \& App Configuration Phone Settings: • Incorrect or conflicting settings \(especially Bluetooth or Wi\-Fi\) on your iPhone can interfere with the CarPlay link. • Third\-Party Apps/Profiles: • Installed apps or configuration profiles may conflict with CarPlay’s operation. • Native apps are apple maps, apple music, audio books, apple news, podcasts, messages and phone. All other apps are considered third party apps. App Conflicts: • Running conflicting apps that require similar system resources as CarPlay can cause instability. Mobile Data Plan: • Streaming from online sources without sufficient mobile data can result in lost connectivity. Other Factors Heat \& Overheating: • If either the phone or the head unit overheats, they may disable certain functions to prevent damage, leading to disconnection. User Actions: • Accidentally disconnecting the device in settings, or physically moving or bumping the phone or cable, may disrupt the connection. Remedy FUP6 \(E605.8\) software has been released for the following chassis: 118, 177, 243,247,206,254,167,294,295,296,223, 297. Flash available software for the head unit and test for function. The LI will be updated once available for the remaining chassis. If the complaint remains after the SW update please continue with the steps below. Guided Diagnostic Path for Apple CarPlay Connection Issues: Please follow the steps below to systematically diagnose and resolve CarPlay concerns:Update Devices: • Ensure the iPhone is updated to the latest available iOS version. • Ensure the vehicle’s head unit is updated to the latest software version available. Isolate the Issue: • Check whether the symptom persists with another iPhone running the latest iOS version. • Test both wireless and wired CarPlay connections: • Does the issue only occur with wireless CarPlay? • Does the wired connection to the phone function correctly? Further Troubleshooting Steps: • Reboot the iPhone. See attachment for further instructions. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036237-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036237-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system ## Vehicles listed - 2019 to 2022 MERCEDES\-BENZ A 220 - 2019 to 2022 MERCEDES\-BENZ A 220 4MATIC - 2020 to 2021 MERCEDES\-BENZ AMG A35 - 2020 MERCEDES\-BENZ AMG A35 4MATIC - 2023 to 2024 MERCEDES\-BENZ AMG C43 - 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC - 2024 MERCEDES\-BENZ AMG C63 S E - 2024 to 2025 MERCEDES\-BENZ AMG C63 S E 4MATIC\+ - 2026 MERCEDES\-BENZ AMG C63 S E PERFORMANCE 4MATIC\+ - 2023 to 2025 MERCEDES\-BENZ AMG EQE - 2023 to 2026 MERCEDES\-BENZ AMG EQE 4MATIC\+ - 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC - 2026 MERCEDES\-BENZ AMG EQE SUV 4MATIC\+ - 2022 to 2024 MERCEDES\-BENZ AMG EQS - 2022 MERCEDES\-BENZ AMG EQS 4MATIC - 2023 to 2025 MERCEDES\-BENZ AMG EQS 4MATIC\+ - 2024 to 2026 MERCEDES\-BENZ AMG GLC43 - 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC - 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE - 2026 MERCEDES\-BENZ AMG GLC43 COUPE - 2025 MERCEDES\-BENZ AMG GLC63 S E - 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ - 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ COUPE - 2024 to 2026 MERCEDES\-BENZ AMG S 63 E 4MATIC\+ - 2023 to 2026 MERCEDES\-BENZ AMG SL43 - 2022 to 2025 MERCEDES\-BENZ AMG SL55 - 2023 to 2026 MERCEDES\-BENZ AMG SL55 4MATIC\+ - 2022 to 2023 MERCEDES\-BENZ AMG SL63 - 2025 MERCEDES\-BENZ AMG SL63 - 2023 to 2026 MERCEDES\-BENZ AMG SL63 4MATIC\+ - 2024 to 2025 MERCEDES\-BENZ AMG SL63 S E - 2024 to 2026 MERCEDES\-BENZ AMG SL63 S E PERFORMANCE 4MATIC\+ - 2022 to 2026 MERCEDES\-BENZ C 300 - 2022 to 2026 MERCEDES\-BENZ C 300 4MATIC - 2026 MERCEDES\-BENZ EQE 320 4MATIC - 2026 MERCEDES\-BENZ EQE 320\+ - 2023 to 2025 MERCEDES\-BENZ EQE 350 4MATIC - 2023 to 2026 MERCEDES\-BENZ EQE 350\+ - 2023 to 2025 MERCEDES\-BENZ EQE 500 - 2023 to 2025 MERCEDES\-BENZ EQE 500 4MATIC - 2026 MERCEDES\-BENZ EQE SUV 320 4MATIC - 2026 MERCEDES\-BENZ EQE SUV 320\+ - 2023 to 2025 MERCEDES\-BENZ EQE SUV 350 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQE SUV 350\+ - 2023 to 2025 MERCEDES\-BENZ EQE SUV 500 4MATIC - 2022 MERCEDES\-BENZ EQS 450 - 2023 to 2025 MERCEDES\-BENZ EQS 450 4MATIC - 2022 to 2025 MERCEDES\-BENZ EQS 450\+ - 2022 to 2024 MERCEDES\-BENZ EQS 580 - 2022 to 2025 MERCEDES\-BENZ EQS 580 4MATIC - 2026 MERCEDES\-BENZ EQS SUV 400 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQS SUV 450 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQS SUV 450\+ - 2026 MERCEDES\-BENZ EQS SUV 550 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQS SUV 580 4MATIC - 2023 to 2026 MERCEDES\-BENZ GLC 300 - 2023 to 2026 MERCEDES\-BENZ GLC 300 4MATIC - 2024 to 2026 MERCEDES\-BENZ GLC 300 4MATIC COUPE - 2024 MERCEDES\-BENZ GLC 300 COUPE - 2025 to 2026 MERCEDES\-BENZ GLC 350 E 4MATIC - 2026 MERCEDES\-BENZ GLC43 4MATIC COUPE - 2021 MERCEDES\-BENZ S 500 - 2023 MERCEDES\-BENZ S 500 - 2023 MERCEDES\-BENZ S 500 4MATIC - 2025 to 2026 MERCEDES\-BENZ S 500 4MATIC - 2021 MERCEDES\-BENZ S 580 - 2023 MERCEDES\-BENZ S 580 - 2022 to 2026 MERCEDES\-BENZ S 580 4MATIC - 2023 MERCEDES\-BENZ S 580 E - 2023 to 2026 MERCEDES\-BENZ S 580 E 4MATIC - 2024 to 2026 MERCEDES\-MAYBACH EQS SUV 680 4MATIC - 2021 MERCEDES\-MAYBACH S 580 - 2022 to 2026 MERCEDES\-MAYBACH S 580 4MATIC - 2023 to 2024 MERCEDES\-MAYBACH S 680 - 2022 to 2026 MERCEDES\-MAYBACH S 680 4MATIC - 2026 MERCEDES\-MAYBACH SL 680 4MATIC\+ JSON: [/v1/bulletins/11036237](/v1/bulletins/11036237) [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%20LI82.85-P-079088&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11036237&vehicle=Service%20bulletin%20LI82.85-P-079088)