Image available on the official notice.
Passenger Cars (Mercedes-Benz Mercedes-AMG S63 E PERFORMANCE and 5 Other Models) - Repair
Official notice
15 May 2025
Last checked
27 Oct 2026
An official CAA Japan notice concerns Passenger Cars (Mercedes-Benz Mercedes-AMG S63 E PERFORMANCE and 5 Other Models) - Repair. Engine (high-voltage starter-alternator) defect. Defective part (component name): Engine (high-voltage starter-alternator). Details and cause of the structure, equipment or performance considered noncompliant with standards: Due to inadequate design consideration in the high-voltage starter-alternator control program, the system monitoring function may incorrectly detect a fault and stop operation of the high-voltage starter-alternator. Consequently, during hybrid driving, motor assistance is lost, which may increase fuel injection and exhaust emissions. During electric driving, the high-voltage circuit may be disconnected to protect the high-voltage battery, potentially rendering the vehicle unable to continue driving. Published 2025-05-15.
What to do now
Recall notification number: 外-3991. Corrective measures: Reprogram the high-voltage starter-alternator control software with the corrective control software on all vehicles.
Units affected
967
Recall number
外-3991
Official notice
2025-05-15
The hazard
The hazard
Engine (high-voltage starter-alternator) defect. Defective part (component name): Engine (high-voltage starter-alternator). Details and cause of the structure, equipment or performance considered noncompliant with standards: Due to inadequate design consideration in the high-voltage starter-alternator control program, the system monitoring function may incorrectly detect a fault and stop operation of the high-voltage starter-alternator. Consequently, during hybrid driving, motor assistance is lost, which may increase fuel injection and exhaust emissions. During electric driving, the high-voltage circuit may be disconnected to protect the high-voltage battery, potentially rendering the vehicle unable to continue driving.
How to check if you're affected
How to check if you're affected
Compare the product name and identifiers below with the item you own. Check the official notice for the affected products and next steps.
Models
Recall Numbers
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Affected products
Product 1
Units affected
Hazard
Where it was sold
Where it was sold
Retailer information is not currently available in RecallScope. Check the official notice for distribution details.
Location 1
Affected area 1
Company & contacts
Company & contacts
Brand: Mercedes-Benz. Contact: メルセデス・ベンツ日本合同会社. Phone 0120-086-880.
Source & status
Source & status
Recall details
Recall details
Recall number
Event id
Units affected
Source tier
Documents, notices & source
See the official notice and source documents for full details.
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