Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCEDES BENZ2021GT 53 AMGREPAIR AND DIAGNOSISQUICK LOOKUPSTECHNICAL BULLETINSTECHNICAL SERVICE BULLETINS
2021 Mercedes Benz GT 53 AMG
Technical Service Bulletins
2021 Mercedes Benz GT 53 AMGSECTION Technical Service Bulletins
- Accessories Control Systems
- MERCEDES Me Connect Inoperative/Vehicle Offline (LI82.95-P-076991)
- COMAND/MBUX USB Map Update: Aborts, Does Not Load To Head Unit (LI82.85-P-071933)
- MBUX Multimedia System: DASHCAM Temporarily Inoperable (LI82.85-P-073387)
- MBUX Multimedia System: Dynamic Select/Vehicle Settings/Energy Flow Display Incomplete After Software Update (LI82.85-P-073283)
- MBUX Multimedia System: Speech Dialog System (SDS, "Hey MERCEDES") Voice Output Not Present And General SDS System Complaints (LI82.85-P-073229)
- Incorrect Time And/Or Instrument Cluster Message "SOS, Service Not Activated" And/Or MERCEDES Me Connect Services Nonfunctional (LI82.85-P-071453)
- COMAND Download Manager (DLM): Download Aborted, Does Not Load To Selected USB Drive (LI82.85-P-071912)
- Aerodynamic Devices
- Anti-Theft Systems
- Automatic Trans
- Tension-Releasing Impact Of The Propeller Shaft After Vehicle Has Stopped (VERSION 3)
- Pre-Case Creation For 725.0/. 1 Transmissions (LI27.00-P-075630 V4)
- Direct Selection Lever Module Cannot Be Switched To Park Position "P" - Malfunction Of "P" Button (LI27.60-P-077704)
- Leaks On Transmission 725.0 (LI27.10-P-063063)
- Howling Noise In Interior (LI27.57-P-064623)
- Axle Shafts
- Battery Management Systems
- Body Electrical
- Body Interior
- Brakes Control Systems
- Communication Devices
- MBUX Multimedia System: The Head Unit Does Not Start-Up At Ignition On B19C804 (LI82.85-P-069381)
- MERCEDES Me Connect Inoperative/Vehicle Offline (LI82.95-P-076991)
- B129C00 - Instrument Cluster Warning: SOS Inoperative (LI82.85-P-076800)
- Weather App Displays The Temperature In The Wrong Unit (LI82.85-P-075375)
- The MERCEDES Me Connect Services Cannot Be Activated Due To Sim Test Dataset Value (LI82.85-P-075669)
- The Mobile Phone Address Book Is Not Transferred Completely (LI82.70-P-071024)
- MBUX Multimedia System: XENTRY Diagnosis Message "The MBUX Multimedia System: Control Unit Abnormal" (LI82.85-P-071394)
- Insufficient Wireless Charging With IPHONE 12 Or Newer (LI82.70-P-073025)
- MERCEDES Me Connect Services Cannot Be Activated Due To APN Network Configuration (LI82.85-P-074413)
- MBUX Multimedia System: Map Data Does Not Match With Your System/The Navigation System Cannot Be Activated (LI82.85-P-069961)
- COMAND/MBUX USB Map Update: Aborts, Does Not Load To Head Unit (LI82.85-P-071933)
- MBUX Multimedia System: DASHCAM Temporarily Inoperable (LI82.85-P-073387)
- MBUX Multimedia System: Dynamic Select/Vehicle Settings/Energy Flow Display Incomplete After Software Update (LI82.85-P-073283)
- Free Browsing, Internet Access Via WI-FI HOTSPOT And Internet Radio Nonfunctional (LI82.85-P-068846)
- MBUX Multimedia System: Speech Dialog System (SDS, "Hey MERCEDES") Voice Output Not Present And General SDS System Complaints (LI82.85-P-073229)
- New Map Data Cannot Be Downloaded By The Customer From The MERCEDES Me Portal (LI82.85-P-072730)
- COMAND Download Manager (DLM): Download Aborted, Does Not Load To Selected USB Drive (LI82.85-P-071912)
- Cooling Fan
- Cooling System (Mechanical)
- Cooling Systems
- Differentials & Drive Axles
- Electric Motor Systems
- Engine Control Systems
- Functional Impairment Of 48 V On-Board Electrical System (VERSION 20)
- Vehicle Handover Cannot Be Performed (LI00.20-P-077615)
- "SOS Nonfunctional" Message In The Instrument Cluster Display. DTC B129C00 Stored In Control Unit HERMES (LI82.95-P-074844)
- Coolant Temperature Warning In Ic DTCS P0A9300, P26CE22, U011564 In Various Control Modules (LI20.00-P-071399)
- Entertainment Systems
- MBUX Multimedia System: The Head Unit Does Not Start-Up At Ignition On B19C804 (LI82.85-P-069381)
- MBUX Multimedia System (A26/17) - SIRIUSXM "My Favorites" Category Lost After Bus Sleep (LI82.60-P-075292)
- MBUX NTG7 Without Code 365 Navigation - Radio Station Logos No Longer Displayed After Software Update (LI82.85-P-076200)
- MBUX Multimedia System: XENTRY Diagnosis Message "The MBUX Multimedia System: Control Unit Abnormal" (LI82.85-P-071394)
- My19+ G-Class: Background Noise/Buzzing In Front/Rear Door When Playing Audio Via Sound System (LI72.29-P-074561)
- No Longer Possible To Adjust Temperature With The Rear Touchscreen (LI83.57-P-074092)
- COMAND/MBUX USB Map Update: Aborts, Does Not Load To Head Unit (LI82.85-P-071933)
- MBUX Multimedia System: DASHCAM Temporarily Inoperable (LI82.85-P-073387)
- MBUX Multimedia System: Dynamic Select/Vehicle Settings/Energy Flow Display Incomplete After Software Update (LI82.85-P-073283)
- Free Browsing, Internet Access Via WI-FI HOTSPOT And Internet Radio Nonfunctional (LI82.85-P-068846)
- MBUX Multimedia System: Speech Dialog System (SDS, "Hey MERCEDES") Voice Output Not Present And General SDS System Complaints (LI82.85-P-073229)
- MBUX Multimedia System: No GPS Reception/Position Of Vehicle In Navigation Menu Is Inaccurate (LI82.85-P-072960)
- New Map Data Cannot Be Downloaded By The Customer From The MERCEDES Me Portal (LI82.85-P-072730)
- COMAND Download Manager (DLM): Download Aborted, Does Not Load To Selected USB Drive (LI82.85-P-071912)
- Exterior Body Panels
- Exterior Lights
- Fuses & Circuit Breakers
- Gauges & Instrument Panels
- BR 290 - Rear Spoiler Sporadically Inoperative With Fault Message In The Instrument Cluster (VERSION 6)
- Vehicle Handover Cannot Be Performed (LI00.20-P-077615)
- "SOS Nonfunctional" Message In The Instrument Cluster Display. DTC B129C00 Stored In Control Unit HERMES (LI82.95-P-074844)
- Weather App Displays The Temperature In The Wrong Unit (LI82.85-P-075375)
- Coolant Temperature Warning In Ic DTCS P0A9300, P26CE22, U011564 In Various Control Modules (LI20.00-P-071399)
- Oil Pressure Message In Instrument Cluster (LI18.00-P-073137)
- Vertical Stripes In Head-Up Display (LI54.30-P-067674)
- NTG5.5: Incorrect Time Shown On Instrument Cluster, COMAND Display, And Analog Clock (LI54.30-P-072145)
- Headlights
- HVAC Control Systems
- Infotainment
- MBUX Multimedia System: The Head Unit Does Not Start-Up At Ignition On B19C804 (LI82.85-P-069381)
- B129C00 - Instrument Cluster Warning: SOS Inoperative (LI82.85-P-076800)
- MBUX Multimedia System (A26/17) - SIRIUSXM "My Favorites" Category Lost After Bus Sleep (LI82.60-P-075292)
- MBUX NTG7 Without Code 365 Navigation - Radio Station Logos No Longer Displayed After Software Update (LI82.85-P-076200)
- The MERCEDES Me Connect Services Cannot Be Activated Due To Sim Test Dataset Value (LI82.85-P-075669)
- MBUX Multimedia System: XENTRY Diagnosis Message "The MBUX Multimedia System: Control Unit Abnormal" (LI82.85-P-071394)
- MERCEDES Me Connect Services Cannot Be Activated Due To APN Network Configuration (LI82.85-P-074413)
- MBUX Multimedia System: Map Data Does Not Match With Your System/The Navigation System Cannot Be Activated (LI82.85-P-069961)
- COMAND/MBUX USB Map Update: Aborts, Does Not Load To Head Unit (LI82.85-P-071933)
- MBUX Multimedia System: Dynamic Select/Vehicle Settings/Energy Flow Display Incomplete After Software Update (LI82.85-P-073283)
- Free Browsing, Internet Access Via WI-FI HOTSPOT And Internet Radio Nonfunctional (LI82.85-P-068846)
- MBUX Multimedia System: Speech Dialog System (SDS, "Hey MERCEDES") Voice Output Not Present And General SDS System Complaints (LI82.85-P-073229)
- MBUX Multimedia System: No GPS Reception/Position Of Vehicle In Navigation Menu Is Inaccurate (LI82.85-P-072960)
- New Map Data Cannot Be Downloaded By The Customer From The MERCEDES Me Portal (LI82.85-P-072730)
- COMAND Download Manager (DLM): Download Aborted, Does Not Load To Selected USB Drive (LI82.85-P-071912)
- Interior/Illumination Lights
- Lubrication System
- Manual Steering
- Mechanical
- Mechanical - Hydraulic
- Procedures
- Seats
- Starter
- Steering Column
- Transfer Case
- Transmission Control Systems
- Recall Campaign 2024100002 - Replace Transmission Wiring Harness (2024100002)
- Recall Campaign 2024100003 - Replace Transmission Wiring Harness (2024100003)
- DSI Selection Lever Module Cannot Be Switched To Park Position "P" - Malfunction Of "P" Button (VERSION 5)
- Initial Startup Not Possible After Replacement Of Transmission 725.0 Or Of ELECTROHYDRAULIC Controller Unit (LI27.00-P-068206)
- Wheel Hubs
- Wheels & Tire System
- Window Motors & Regulators
- Wiper/Washer Systems
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.