NHTSA ID Number: 11026607
Manufacturer Communication Number: LI82.85-P-079530
TSB/Document Date: 2025-12-15
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 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 Device and Software Topics: Head Unit Software/Hardware: • Hardware causes or outdated firmware in the vehicle’s head unit can prevent a stable connection. iPhone Software/Hardware: • Similar causes in the iPhone, including outdated iOS versions or hardware causes, may affect performance.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 • Cables: A compromised or poor-quality iPhone-USB cable can cause intermittent or total loss of connection. • USB Ports: Dust, debris, or physical deformation 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: • 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 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. • Reboot the head unit via the settings menu (user data reset). • Remove saved CarPlay connections • Delete the head unit information from the iPhone (see attached video for guidance). • Delete the iPhone from the head unit’s list of paired devices. • Remove the head unit entry from CarPlay settings on the iPhone. • Re-initiate pairing between the head unit and the iPhone to establish a new connection certificate. See attachment for complete text.
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TSB/Document ID: LI82.85-P-079530
Replacement Service Bulletin Number:
MFR Communication Date: 2025-12-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
All model series with MBUX CIVICi2 and CIVICi3
- Connectivity interruptions for Apple CarPlay
Topic number
LI82.85-P-079530
Version
2
Function group
82.85 - Navigation and Communication systems
Date
12/12/25
Validity
All model series with MBUX CIVICi2 with Code 528 or
Code 529
Reason for change
adding CIVICi3
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 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.
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© Copyright Mercedes-Benz
AG
SAHARRY
Page 1 / 4
Device and Software Topics:
Head Unit Software/Hardware:
• Hardware causes or outdated firmware in the vehicle’s head unit can prevent a stable connection.
iPhone Software/Hardware:
• Similar causes in the iPhone, including outdated iOS versions or hardware causes, 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:
• Cables: A compromised or poor-quality iPhone-USB cable can cause intermittent or total loss of connection.
• USB Ports: Dust, debris, or physical deformation 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 CarPlay 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:
• 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.
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© Copyright Mercedes-Benz AG
SAHARRY
Page 2 / 4
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
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.
• Reboot the head unit via the settings menu (user data reset).
• Remove saved CarPlay connections
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© Copyright Mercedes-Benz AG
SAHARRY
Page 3 / 4
• Delete the head unit information from the iPhone (see attached video for guidance).
• Delete the iPhone from the head unit’s list of paired devices.
• Remove the head unit entry from CarPlay settings on the iPhone.
• Re-initiate pairing between the head unit and the iPhone to establish a new connection certificate.
Documentation and Additional Testing:
• If possible, provide a picture or short video showing the symptom.
• Check if similar symptoms occur when using Android Auto (if available)
If complaint persists please open a tips case with the attached questionnaire fully completed. A request for head unit
logging may be needed. If determined the head unit logs are needed to further diagnose the symptom the instructions
to do so will be provided in the TIPS case.
Attachments
File
Description
Deleting Carplay Connection from iPhone.MP4
Settings -> General -> Carplay -> Delete MBUX
ACP+Questionnaire+.pdf
Please complete this questionnaire
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Communication/information > Entertainment > USB input > Malfunction
Communication/information > Entertainment > USB input > Not detected
Communication/information > Entertainment > USB input > Audio output faulty
Communication/information > Entertainment > Apple CarPlay > Malfunction
Communication/information > Entertainment > Apple CarPlay > No connection possible
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
Damage
code
Note
H
820D2
Refer to this Tips Document for warranty claims
SAHARRY
Page 4 / 4
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